Merge branch 'master' of git://git.denx.de/u-boot-video

Documentation/devicetree/bindings/axi/gdsys,ihs_axi.txt

@@ -0,0 +1,22 @@
+gdsys AXI busses of IHS FPGA devices
+
+Certain gdsys IHS FPGAs offer a interface to their built-in AXI bus with which
+the connected devices (usually IP cores) can be controlled via software.
+
+Required properties:
+- compatible: must be "gdsys,ihs_axi"
+- reg: describes the address and length of the AXI bus's register map (within
+  the FPGA's register space)
+
+Example:
+
+fpga0_axi_video0 {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible = "gdsys,ihs_axi";
+	reg = <0x170 0x10>;
+
+	axi_dev_1 {
+        ...
+	};
+};

arch/sandbox/dts/sandbox.dts

@@ -11,6 +11,7 @@
 		i2c0 = &i2c_0;
 		pci0 = &pci;
 		rtc0 = &rtc_0;
+		axi0 = &axi;
 	};
 
 	chosen {
@@ -311,6 +312,16 @@
 			};
 		};
 	};
+
+	axi: axi@0 {
+		compatible = "sandbox,axi";
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		store@0 {
+			compatible = "sandbox,sandbox_store";
+			reg = <0x0 0x400>;
+		};
+	};
 };
 
 #include "cros-ec-keyboard.dtsi"

arch/sandbox/dts/test.dts

@@ -36,6 +36,7 @@
 		usb0 = &usb_0;
 		usb1 = &usb_1;
 		usb2 = &usb_2;
+		axi0 = &axi;
 	};
 
 	a-test {
@@ -552,6 +553,16 @@
 		compatible = "sandbox,wdt";
 	};
 
+	axi: axi@0 {
+		compatible = "sandbox,axi";
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		store@0 {
+			compatible = "sandbox,sandbox_store";
+			reg = <0x0 0x400>;
+		};
+	};
+
 	chosen {
 		#address-cells = <1>;
 		#size-cells = <1>;

arch/sandbox/include/asm/axi.h

@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#ifndef __asm_axi_h
+#define __asm_axi_h
+
+#define axi_emul_get_ops(dev)	((struct axi_emul_ops *)(dev)->driver->ops)
+
+/**
+ * axi_sandbox_get_emul() - Retrieve a pointer to a AXI emulation device
+ * @bus:     The AXI bus from which to retrieve a emulation device
+ * @address: The address of a transfer that should be handled by a emulation
+ *	     device
+ * @length:  The data width of a transfer that should be handled by a emulation
+ *	     device
+ * @emulp:   Pointer to a buffer receiving the emulation device that handles
+ *	     the transfer specified by the address and length parameters
+ *
+ * To test the AXI uclass, we implement a simple AXI emulation device, which is
+ * a virtual device on a AXI bus that exposes a simple storage interface: When
+ * reading and writing from the device, the addresses are translated to offsets
+ * within the device's storage. For write accesses the data is written to the
+ * specified storage offset, and for read accesses the data is read from the
+ * specified storage offset.
+ *
+ * A DTS entry might look like this:
+ *
+ * axi: axi@0 {
+ *	compatible = "sandbox,axi";
+ *	#address-cells = <0x1>;
+ *	#size-cells = <0x1>;
+ *	store@0 {
+ *		compatible = "sandbox,sandbox_store";
+ *		reg = <0x0 0x400>;
+ *	};
+ * };
+ *
+ * This function may then be used to retrieve the pointer to the sandbox_store
+ * emulation device given the AXI bus device, and the data (address, data
+ * width) of a AXI transfer which should be handled by a emulation device.
+ *
+ * Return: 0 of OK, -ENODEV if no device capable of handling the specified
+ *	   transfer exists or the device could not be retrieved
+ */
+int axi_sandbox_get_emul(struct udevice *bus, ulong address, uint length,
+			 struct udevice **emulp);
+/**
+ * axi_get_store() - Get address of internal storage of a emulated AXI device
+ * @dev:	Emulated AXI device to get the pointer of the internal storage
+ *		for.
+ * @storep:	Pointer to the internal storage of the emulated AXI device.
+ *
+ * To preset or read back the contents internal storage of the emulated AXI
+ * device, this function returns the pointer to the storage. Changes to the
+ * contents of the storage are reflected when using the AXI read/write API
+ * methods, and vice versa, so by using this method expected read data can be
+ * set up in advance, and written data can be checked in unit tests.
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int axi_get_store(struct udevice *dev, u8 **storep);
+
+#endif /* __asm_axi_h */

cmd/Kconfig

@@ -1027,6 +1027,14 @@ config CMD_USB_MASS_STORAGE
 	help
 	  USB mass storage support
 
+config CMD_AXI
+	bool "axi"
+	depends on AXI
+	help
+	  Enable the command "axi" for accessing AXI (Advanced eXtensible
+	  Interface) busses, a on-chip interconnect specification for managing
+	  functional blocks in SoC designs, which is also often used in designs
+	  involving FPGAs (e.g.  communication with IP cores in Xilinx FPGAs).
 endmenu
 
 

cmd/Makefile

@@ -149,6 +149,7 @@ obj-$(CONFIG_CMD_ZFS) += zfs.o
 obj-$(CONFIG_CMD_DFU) += dfu.o
 obj-$(CONFIG_CMD_GPT) += gpt.o
 obj-$(CONFIG_CMD_ETHSW) += ethsw.o
+obj-$(CONFIG_CMD_AXI) += axi.o
 
 # Power
 obj-$(CONFIG_CMD_PMIC) += pmic.o

cmd/axi.c

@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
+ *
+ * (C) Copyright 2017, 2018
+ * Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <command.h>
+#include <console.h>
+#include <dm.h>
+
+/* Currently selected AXI bus device */
+static struct udevice *axi_cur_bus;
+/* Transmission size from last command */
+static uint dp_last_size;
+/* Address from last command */
+static uint dp_last_addr;
+/* Number of bytes to display from last command; default = 64 */
+static uint dp_last_length = 0x40;
+
+/**
+ * show_bus() - Show devices on a single AXI bus
+ * @bus: The AXI bus device to printt information for
+ */
+static void show_bus(struct udevice *bus)
+{
+	struct udevice *dev;
+
+	printf("Bus %d:\t%s", bus->req_seq, bus->name);
+	if (device_active(bus))
+		printf("  (active %d)", bus->seq);
+	printf("\n");
+	for (device_find_first_child(bus, &dev);
+	     dev;
+	     device_find_next_child(&dev))
+		printf("  %s\n", dev->name);
+}
+
+/**
+ * axi_set_cur_bus() - Set the currently active AXI bus
+ * @busnum: The number of the bus (i.e. its sequence number) that should be
+ *	    made active
+ *
+ * The operations supplied by this command operate only on the currently active
+ * bus.
+ *
+ * Return: 0 if OK, -ve on error
+ */
+static int axi_set_cur_bus(unsigned int busnum)
+{
+	struct udevice *bus;
+	struct udevice *dummy;
+	int ret;
+
+	/* Make sure that all sequence numbers are initialized */
+	for (uclass_first_device(UCLASS_AXI, &dummy);
+	     dummy;
+	     uclass_next_device(&dummy))
+		;
+
+	ret = uclass_get_device_by_seq(UCLASS_AXI, busnum, &bus);
+	if (ret) {
+		debug("%s: No bus %d\n", __func__, busnum);
+		return ret;
+	}
+	axi_cur_bus = bus;
+
+	return 0;
+}
+
+/**
+ * axi_get_cur_bus() - Retrieve the currently active AXI bus device
+ * @busp: Pointer to a struct udevice that receives the currently active bus
+ *	  device
+ *
+ * Return: 0 if OK, -ve on error
+ */
+static int axi_get_cur_bus(struct udevice **busp)
+{
+	if (!axi_cur_bus) {
+		puts("No AXI bus selected\n");
+		return -ENODEV;
+	}
+	*busp = axi_cur_bus;
+
+	return 0;
+}
+
+/*
+ * Command handlers
+ */
+
+static int do_axi_show_bus(cmd_tbl_t *cmdtp, int flag, int argc,
+			   char * const argv[])
+{
+	struct udevice *dummy;
+
+	/* Make sure that all sequence numbers are initialized */
+	for (uclass_first_device(UCLASS_AXI, &dummy);
+	     dummy;
+	     uclass_next_device(&dummy))
+		;
+
+	if (argc == 1) {
+		/* show all busses */
+		struct udevice *bus;
+
+		for (uclass_first_device(UCLASS_AXI, &bus);
+		     bus;
+		     uclass_next_device(&bus))
+			show_bus(bus);
+	} else {
+		int i;
+
+		/* show specific bus */
+		i = simple_strtoul(argv[1], NULL, 10);
+
+		struct udevice *bus;
+		int ret;
+
+		ret = uclass_get_device_by_seq(UCLASS_AXI, i, &bus);
+		if (ret) {
+			printf("Invalid bus %d: err=%d\n", i, ret);
+			return CMD_RET_FAILURE;
+		}
+		show_bus(bus);
+	}
+
+	return 0;
+}
+
+static int do_axi_bus_num(cmd_tbl_t *cmdtp, int flag, int argc,
+			  char * const argv[])
+{
+	int ret = 0;
+	int bus_no;
+
+	if (argc == 1) {
+		/* querying current setting */
+		struct udevice *bus;
+
+		if (!axi_get_cur_bus(&bus))
+			bus_no = bus->seq;
+		else
+			bus_no = -1;
+
+		printf("Current bus is %d\n", bus_no);
+	} else {
+		bus_no = simple_strtoul(argv[1], NULL, 10);
+		printf("Setting bus to %d\n", bus_no);
+
+		ret = axi_set_cur_bus(bus_no);
+		if (ret)
+			printf("Failure changing bus number (%d)\n", ret);
+	}
+
+	return ret ? CMD_RET_FAILURE : 0;
+}
+
+static int do_axi_md(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	/* Print that many bytes per line */
+	const uint DISP_LINE_LEN = 16;
+	u8 linebuf[DISP_LINE_LEN];
+	unsigned int k;
+	ulong addr, length, size;
+	ulong nbytes;
+	enum axi_size_t axisize;
+	int unitsize;
+
+	/*
+	 * We use the last specified parameters, unless new ones are
+	 * entered.
+	 */
+	size = dp_last_size;
+	addr = dp_last_addr;
+	length = dp_last_length;
+
+	if (argc < 3)
+		return CMD_RET_USAGE;
+
+	if (!axi_cur_bus) {
+		puts("No AXI bus selected\n");
+		return CMD_RET_FAILURE;
+	}
+
+	if ((flag & CMD_FLAG_REPEAT) == 0) {
+		size = simple_strtoul(argv[1], NULL, 10);
+
+		/*
+		 * Address is specified since argc >= 3
+		 */
+		addr = simple_strtoul(argv[2], NULL, 16);
+
+		/*
+		 * If there's another parameter, it is the length to display;
+		 * length is the number of objects, not number of bytes
+		 */
+		if (argc > 3)
+			length = simple_strtoul(argv[3], NULL, 16);
+	}
+
+	switch (size) {
+	case 8:
+		axisize = AXI_SIZE_8;
+		unitsize = 1;
+		break;
+	case 16:
+		axisize = AXI_SIZE_16;
+		unitsize = 2;
+		break;
+	case 32:
+		axisize = AXI_SIZE_32;
+		unitsize = 4;
+		break;
+	default:
+		printf("Unknown read size '%lu'\n", size);
+		return CMD_RET_USAGE;
+	};
+
+	nbytes = length * unitsize;
+	do {
+		ulong linebytes = (nbytes > DISP_LINE_LEN) ?
+				  DISP_LINE_LEN : nbytes;
+
+		for (k = 0; k < linebytes / unitsize; ++k) {
+			int ret = axi_read(axi_cur_bus, addr + k * unitsize,
+					   linebuf + k * unitsize, axisize);
+
+			if (!ret) /* Continue if axi_read was successful */
+				continue;
+
+			if (ret == -ENOSYS)
+				printf("axi_read failed; read size not supported?\n");
+			else
+				printf("axi_read failed: err = %d\n", ret);
+
+			return CMD_RET_FAILURE;
+		}
+		print_buffer(addr, (void *)linebuf, unitsize,
+			     linebytes / unitsize,
+			     DISP_LINE_LEN / unitsize);
+
+		nbytes -= max(linebytes, 1UL);
+		addr += linebytes;
+
+		if (ctrlc())
+			break;
+	} while (nbytes > 0);
+
+	dp_last_size = size;
+	dp_last_addr = addr;
+	dp_last_length = length;
+
+	return 0;
+}
+
+static int do_axi_mw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	u32 writeval;
+	ulong addr, count, size;
+	enum axi_size_t axisize;
+
+	if (argc <= 3 || argc >= 6)
+		return CMD_RET_USAGE;
+
+	size = simple_strtoul(argv[1], NULL, 10);
+
+	switch (size) {
+	case 8:
+		axisize = AXI_SIZE_8;
+		break;
+	case 16:
+		axisize = AXI_SIZE_16;
+		break;
+	case 32:
+		axisize = AXI_SIZE_32;
+		break;
+	default:
+		printf("Unknown write size '%lu'\n", size);
+		return CMD_RET_USAGE;
+	};
+
+	/* Address is specified since argc > 4 */
+	addr = simple_strtoul(argv[2], NULL, 16);
+
+	/* Get the value to write */
+	writeval = simple_strtoul(argv[3], NULL, 16);
+
+	/* Count ? */
+	if (argc == 5)
+		count = simple_strtoul(argv[4], NULL, 16);
+	else
+		count = 1;
+
+	while (count-- > 0) {
+		int ret = axi_write(axi_cur_bus, addr + count * sizeof(u32),
+				    &writeval, axisize);
+
+		if (ret) {
+			printf("axi_write failed: err = %d\n", ret);
+			return CMD_RET_FAILURE;
+		}
+	}
+
+	return 0;
+}
+
+static cmd_tbl_t cmd_axi_sub[] = {
+	U_BOOT_CMD_MKENT(bus, 1, 1, do_axi_show_bus, "", ""),
+	U_BOOT_CMD_MKENT(dev, 1, 1, do_axi_bus_num, "", ""),
+	U_BOOT_CMD_MKENT(md, 4, 1, do_axi_md, "", ""),
+	U_BOOT_CMD_MKENT(mw, 5, 1, do_axi_mw, "", ""),
+};
+
+static int do_ihs_axi(cmd_tbl_t *cmdtp, int flag, int argc,
+		      char * const argv[])
+{
+	cmd_tbl_t *c;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	/* Strip off leading 'axi' command argument */
+	argc--;
+	argv++;
+
+	/* Hand off rest of command line to sub-commands */
+	c = find_cmd_tbl(argv[0], &cmd_axi_sub[0], ARRAY_SIZE(cmd_axi_sub));
+
+	if (c)
+		return c->cmd(cmdtp, flag, argc, argv);
+	else
+		return CMD_RET_USAGE;
+}
+
+static char axi_help_text[] =
+	"bus  - show AXI bus info\n"
+	"axi dev [bus] - show or set current AXI bus to bus number [bus]\n"
+	"axi md size addr [# of objects] - read from AXI device at address [addr] and data width [size] (one of 8, 16, 32)\n"
+	"axi mw size addr value [count] - write data [value] to AXI device at address [addr] and data width [size] (one of 8, 16, 32)\n";
+
+U_BOOT_CMD(axi, 7, 1, do_ihs_axi,
+	   "AXI sub-system",
+	   axi_help_text
+);

configs/sandbox_defconfig

@@ -45,6 +45,7 @@ CONFIG_CMD_REMOTEPROC=y
 CONFIG_CMD_SF=y
 CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
+CONFIG_CMD_AXI=y
 CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_TFTPSRV=y
 CONFIG_CMD_RARP=y
@@ -80,6 +81,8 @@ CONFIG_DEVRES=y
 CONFIG_DEBUG_DEVRES=y
 CONFIG_ADC=y
 CONFIG_ADC_SANDBOX=y
+CONFIG_AXI=y
+CONFIG_AXI_SANDBOX=y
 CONFIG_CLK=y
 CONFIG_CPU=y
 CONFIG_DM_DEMO=y

drivers/Kconfig

@@ -8,6 +8,8 @@ source "drivers/adc/Kconfig"
 
 source "drivers/ata/Kconfig"
 
+source "drivers/axi/Kconfig"
+
 source "drivers/block/Kconfig"
 
 source "drivers/bootcount/Kconfig"

drivers/Makefile

@@ -103,6 +103,7 @@ obj-y += smem/
 obj-y += soc/
 obj-$(CONFIG_REMOTEPROC) += remoteproc/
 obj-y += thermal/
+obj-y += axi/
 
 obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
 endif

drivers/axi/Kconfig

@@ -0,0 +1,32 @@
+menuconfig AXI
+	bool "AXI bus drivers"
+	help
+	  Support AXI (Advanced eXtensible Interface) busses, a on-chip
+	  interconnect specification for managing functional blocks in SoC
+	  designs, which is also often used in designs involving FPGAs (e.g.
+	  communication with IP cores in Xilinx FPGAs).
+
+	  These types of busses expose a virtual address space that can be
+	  accessed using different address widths (8, 16, and 32 are supported
+	  for now).
+
+	  Other similar bus architectures may be compatible as well.
+
+if AXI
+
+config IHS_AXI
+	bool "Enable IHS AXI driver"
+	depends on DM
+	help
+	  Support for gdsys Integrated Hardware Systems Advanced eXtensible
+	  Interface (IHS AXI) bus on a gdsys IHS FPGA used to communicate with
+	  IP cores in the FPGA (e.g. video transmitter cores).
+
+config AXI_SANDBOX
+	bool "Enable AXI sandbox driver"
+	depends on DM
+	help
+	  Support AXI (Advanced eXtensible Interface) emulation for the sandbox
+	  environment.
+
+endif

drivers/axi/Makefile

@@ -0,0 +1,12 @@
+#
+# (C) Copyright 2017
+# Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_AXI) += axi-uclass.o
+obj-$(CONFIG_IHS_AXI) += ihs_axi.o
+obj-$(CONFIG_SANDBOX) += axi-emul-uclass.o
+obj-$(CONFIG_SANDBOX) += sandbox_store.o
+obj-$(CONFIG_AXI_SANDBOX) += axi_sandbox.o

drivers/axi/axi-emul-uclass.c

@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <asm/axi.h>
+
+int axi_sandbox_get_emul(struct udevice *bus, ulong address,
+			 enum axi_size_t size, struct udevice **emulp)
+{
+	struct udevice *dev;
+	u32 reg[2];
+	uint offset;
+
+	switch (size) {
+	case AXI_SIZE_8:
+		offset = 1;
+		break;
+	case AXI_SIZE_16:
+		offset = 2;
+		break;
+	case AXI_SIZE_32:
+		offset = 4;
+		break;
+	default:
+		debug("%s: Unknown AXI transfer size '%d'", bus->name, size);
+		offset = 0;
+	}
+
+	/*
+	 * Note: device_find_* don't activate the devices; they're activated
+	 *	 as-needed below.
+	 */
+	for (device_find_first_child(bus, &dev);
+	     dev;
+	     device_find_next_child(&dev)) {
+		int ret;
+
+		ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
+		if (ret) {
+			debug("%s: Could not read 'reg' property of %s\n",
+			      bus->name, dev->name);
+			continue;
+		}
+
+		/*
+		 * Does the transfer's address fall into this device's address
+		 * space?
+		 */
+		if (address >= reg[0] && address <= reg[0] + reg[1] - offset) {
+			/* If yes, activate it... */
+			if (device_probe(dev)) {
+				debug("%s: Could not activate %s\n",
+				      bus->name, dev->name);
+				return -ENODEV;
+			}
+
+			/* ...and return it */
+			*emulp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+int axi_get_store(struct udevice *dev, u8 **storep)
+{
+	struct axi_emul_ops *ops = axi_emul_get_ops(dev);
+
+	if (!ops->get_store)
+		return -ENOSYS;
+
+	return ops->get_store(dev, storep);
+}
+
+UCLASS_DRIVER(axi_emul) = {
+	.id		= UCLASS_AXI_EMUL,
+	.name		= "axi_emul",
+};

drivers/axi/axi-uclass.c

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2017
+ * Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <axi.h>
+
+int axi_read(struct udevice *dev, ulong address, void *data,
+	     enum axi_size_t size)
+{
+	struct axi_ops *ops = axi_get_ops(dev);
+
+	if (!ops->read)
+		return -ENOSYS;
+
+	return ops->read(dev, address, data, size);
+}
+
+int axi_write(struct udevice *dev, ulong address, void *data,
+	      enum axi_size_t size)
+{
+	struct axi_ops *ops = axi_get_ops(dev);
+
+	if (!ops->write)
+		return -ENOSYS;
+
+	return ops->write(dev, address, data, size);
+}
+
+UCLASS_DRIVER(axi) = {
+	.id		= UCLASS_AXI,
+	.name		= "axi",
+	.post_bind	= dm_scan_fdt_dev,
+	.flags		= DM_UC_FLAG_SEQ_ALIAS,
+};
+

drivers/axi/axi_sandbox.c

@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+#include <asm/axi.h>
+
+/*
+ * This driver implements a AXI bus for the sandbox architecture for testing
+ * purposes.
+ *
+ * The bus forwards every access to it to a special AXI emulation device (which
+ * it gets via the axi_emul_get_ops function) that implements a simple
+ * read/write storage.
+ *
+ * The emulator device must still be contained in the device tree in the usual
+ * way, since configuration data for the storage is read from the DT.
+ */
+
+static int axi_sandbox_read(struct udevice *bus, ulong address, void *data,
+			    enum axi_size_t size)
+{
+	struct axi_emul_ops *ops;
+	struct udevice *emul;
+	int ret;
+
+	/* Get emulator device */
+	ret = axi_sandbox_get_emul(bus, address, size, &emul);
+	if (ret)
+		return ret == -ENODEV ? 0 : ret;
+	/* Forward all reads to the AXI emulator */
+	ops = axi_emul_get_ops(emul);
+	if (!ops || !ops->read)
+		return -ENOSYS;
+
+	return ops->read(emul, address, data, size);
+}
+
+static int axi_sandbox_write(struct udevice *bus, ulong address, void *data,
+			     enum axi_size_t size)
+{
+	struct axi_emul_ops *ops;
+	struct udevice *emul;
+	int ret;
+
+	/* Get emulator device */
+	ret = axi_sandbox_get_emul(bus, address, size, &emul);
+	if (ret)
+		return ret == -ENODEV ? 0 : ret;
+	/* Forward all writes to the AXI emulator */
+	ops = axi_emul_get_ops(emul);
+	if (!ops || !ops->write)
+		return -ENOSYS;
+
+	return ops->write(emul, address, data, size);
+}
+
+static const struct udevice_id axi_sandbox_ids[] = {
+	{ .compatible = "sandbox,axi" },
+	{ /* sentinel */ }
+};
+
+static const struct axi_ops axi_sandbox_ops = {
+	.read = axi_sandbox_read,
+	.write = axi_sandbox_write,
+};
+
+U_BOOT_DRIVER(axi_sandbox_bus) = {
+	.name           = "axi_sandbox_bus",
+	.id             = UCLASS_AXI,
+	.of_match       = axi_sandbox_ids,
+	.ops		= &axi_sandbox_ops,
+};

drivers/axi/ihs_axi.c

@@ -0,0 +1,293 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
+ *
+ * (C) Copyright 2017, 2018
+ * Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+#include <regmap.h>
+
+/**
+ * struct ihs_axi_regs - Structure for the register map of a IHS AXI device
+ * @interrupt_status:         Status register to indicate certain events (e.g.
+ *			      error during transfer, transfer complete, etc.)
+ * @interrupt_enable_control: Register to both control which statuses will be
+ *			      indicated in the interrupt_status register, and
+ *			      to change bus settings
+ * @address_lsb:              Least significant 16-bit word of the address of a
+ *			      device to transfer data from/to
+ * @address_msb:              Most significant 16-bit word of the address of a
+ *			      device to transfer data from/to
+ * @write_data_lsb:           Least significant 16-bit word of the data to be
+ *			      written to a device
+ * @write_data_msb:           Most significant 16-bit word of the data to be
+ *			      written to a device
+ * @read_data_lsb:            Least significant 16-bit word of the data read
+ *			      from a device
+ * @read_data_msb:            Most significant 16-bit word of the data read
+ *			      from a device
+ */
+struct ihs_axi_regs {
+	u16 interrupt_status;
+	u16 interrupt_enable_control;
+	u16 address_lsb;
+	u16 address_msb;
+	u16 write_data_lsb;
+	u16 write_data_msb;
+	u16 read_data_lsb;
+	u16 read_data_msb;
+};
+
+/**
+ * ihs_axi_set() - Convenience macro to set values in register map
+ * @map:    The register map to write to
+ * @member: The member of the ihs_axi_regs structure to write
+ * @val:    The value to write to the register map
+ */
+#define ihs_axi_set(map, member, val) \
+	regmap_set(map, struct ihs_axi_regs, member, val)
+
+/**
+ * ihs_axi_get() - Convenience macro to read values from register map
+ * @map:    The register map to read from
+ * @member: The member of the ihs_axi_regs structure to read
+ * @valp:   Pointer to a buffer to receive the value read
+ */
+#define ihs_axi_get(map, member, valp) \
+	regmap_get(map, struct ihs_axi_regs, member, valp)
+
+/**
+ * struct ihs_axi_priv - Private data structure of IHS AXI devices
+ * @map: Register map for the IHS AXI device
+ */
+struct ihs_axi_priv {
+	struct regmap *map;
+};
+
+/**
+ * enum status_reg - Description of bits in the interrupt_status register
+ * @STATUS_READ_COMPLETE_EVENT:  A read transfer was completed
+ * @STATUS_WRITE_COMPLETE_EVENT: A write transfer was completed
+ * @STATUS_TIMEOUT_EVENT:        A timeout has occurred during the transfer
+ * @STATUS_ERROR_EVENT:          A error has occurred during the transfer
+ * @STATUS_AXI_INT:              A AXI interrupt has occurred
+ * @STATUS_READ_DATA_AVAILABLE:  Data is available to be read
+ * @STATUS_BUSY:                 The bus is busy
+ * @STATUS_INIT_DONE:            The bus has finished initializing
+ */
+enum status_reg {
+	STATUS_READ_COMPLETE_EVENT = BIT(15),
+	STATUS_WRITE_COMPLETE_EVENT = BIT(14),
+	STATUS_TIMEOUT_EVENT = BIT(13),
+	STATUS_ERROR_EVENT = BIT(12),
+	STATUS_AXI_INT = BIT(11),
+	STATUS_READ_DATA_AVAILABLE = BIT(7),
+	STATUS_BUSY = BIT(6),
+	STATUS_INIT_DONE = BIT(5),
+};
+
+/**
+ * enum control_reg - Description of bit fields in the interrupt_enable_control
+ *		      register
+ * @CONTROL_READ_COMPLETE_EVENT_ENABLE:  STATUS_READ_COMPLETE_EVENT will be
+ *					 raised in the interrupt_status register
+ * @CONTROL_WRITE_COMPLETE_EVENT_ENABLE: STATUS_WRITE_COMPLETE_EVENT will be
+ *					 raised in the interrupt_status register
+ * @CONTROL_TIMEOUT_EVENT_ENABLE:        STATUS_TIMEOUT_EVENT will be raised in
+ *					 the interrupt_status register
+ * @CONTROL_ERROR_EVENT_ENABLE:          STATUS_ERROR_EVENT will be raised in
+ *					 the interrupt_status register
+ * @CONTROL_AXI_INT_ENABLE:              STATUS_AXI_INT will be raised in the
+ *					 interrupt_status register
+ * @CONTROL_CMD_NOP:                     Configure bus to send a NOP command
+ *					 for the next transfer
+ * @CONTROL_CMD_WRITE:                   Configure bus to do a write transfer
+ * @CONTROL_CMD_WRITE_POST_INC:          Auto-increment address after write
+ *					 transfer
+ * @CONTROL_CMD_READ:                    Configure bus to do a read transfer
+ * @CONTROL_CMD_READ_POST_INC:           Auto-increment address after read
+ *					 transfer
+ */
+enum control_reg {
+	CONTROL_READ_COMPLETE_EVENT_ENABLE = BIT(15),
+	CONTROL_WRITE_COMPLETE_EVENT_ENABLE = BIT(14),
+	CONTROL_TIMEOUT_EVENT_ENABLE = BIT(13),
+	CONTROL_ERROR_EVENT_ENABLE = BIT(12),
+	CONTROL_AXI_INT_ENABLE = BIT(11),
+
+	CONTROL_CMD_NOP = 0x0,
+	CONTROL_CMD_WRITE = 0x8,
+	CONTROL_CMD_WRITE_POST_INC = 0x9,
+	CONTROL_CMD_READ = 0xa,
+	CONTROL_CMD_READ_POST_INC = 0xb,
+};
+
+/**
+ * enum axi_cmd - Determine if transfer is read or write transfer
+ * @AXI_CMD_READ:  The transfer should be a read transfer
+ * @AXI_CMD_WRITE: The transfer should be a write transfer
+ */
+enum axi_cmd {
+	AXI_CMD_READ,
+	AXI_CMD_WRITE,
+};
+
+/**
+ * ihs_axi_transfer() - Run transfer on the AXI bus
+ * @bus:           The AXI bus device on which to run the transfer on
+ * @address:       The address to use in the transfer (i.e. which address to
+ *		   read/write from/to)
+ * @cmd:           Should the transfer be a read or write transfer?
+ *
+ * Return: 0 if OK, -ve on error
+ */
+static int ihs_axi_transfer(struct udevice *bus, ulong address,
+			    enum axi_cmd cmd)
+{
+	struct ihs_axi_priv *priv = dev_get_priv(bus);
+	/* Try waiting for events up to 10 times */
+	const uint WAIT_TRIES = 10;
+	u16 wait_mask = STATUS_TIMEOUT_EVENT |
+			STATUS_ERROR_EVENT;
+	u16 complete_flag;
+	u16 status;
+	uint k;
+
+	if (cmd == AXI_CMD_READ) {
+		complete_flag = STATUS_READ_COMPLETE_EVENT;
+		cmd = CONTROL_CMD_READ;
+	} else {
+		complete_flag = STATUS_WRITE_COMPLETE_EVENT;
+		cmd = CONTROL_CMD_WRITE;
+	}
+
+	wait_mask |= complete_flag;
+
+	/* Lower 16 bit */
+	ihs_axi_set(priv->map, address_lsb, address & 0xffff);
+	/* Upper 16 bit */
+	ihs_axi_set(priv->map, address_msb, (address >> 16) & 0xffff);
+
+	ihs_axi_set(priv->map, interrupt_status, wait_mask);
+	ihs_axi_set(priv->map, interrupt_enable_control, cmd);
+
+	for (k = WAIT_TRIES; k > 0; --k) {
+		ihs_axi_get(priv->map, interrupt_status, &status);
+		if (status & wait_mask)
+			break;
+		udelay(1);
+	}
+
+	/*
+	 * k == 0 -> Tries ran out with no event we were waiting for actually
+	 * occurring.
+	 */
+	if (!k)
+		ihs_axi_get(priv->map, interrupt_status, &status);
+
+	if (status & complete_flag)
+		return 0;
+
+	if (status & STATUS_ERROR_EVENT) {
+		debug("%s: Error occurred during transfer\n", bus->name);
+		return -EIO;
+	}
+
+	debug("%s: Transfer timed out\n", bus->name);
+	return -ETIMEDOUT;
+}
+
+/*
+ * API
+ */
+
+static int ihs_axi_read(struct udevice *dev, ulong address, void *data,
+			enum axi_size_t size)
+{
+	struct ihs_axi_priv *priv = dev_get_priv(dev);
+	int ret;
+	u16 data_lsb, data_msb;
+	u32 *p = data;
+
+	if (size != AXI_SIZE_32) {
+		debug("%s: transfer size '%d' not supported\n",
+		      dev->name, size);
+		return -ENOSYS;
+	}
+
+	ret = ihs_axi_transfer(dev, address, AXI_CMD_READ);
+	if (ret < 0) {
+		debug("%s: Error during AXI transfer (err = %d)\n",
+		      dev->name, ret);
+		return ret;
+	}
+
+	ihs_axi_get(priv->map, read_data_lsb, &data_lsb);
+	ihs_axi_get(priv->map, read_data_msb, &data_msb);
+
+	/* Assemble data from two 16-bit words */
+	*p = (data_msb << 16) | data_lsb;
+
+	return 0;
+}
+
+static int ihs_axi_write(struct udevice *dev, ulong address, void *data,
+			 enum axi_size_t size)
+{
+	struct ihs_axi_priv *priv = dev_get_priv(dev);
+	int ret;
+	u32 *p = data;
+
+	if (size != AXI_SIZE_32) {
+		debug("%s: transfer size '%d' not supported\n",
+		      dev->name, size);
+		return -ENOSYS;
+	}
+
+	/* Lower 16 bit */
+	ihs_axi_set(priv->map, write_data_lsb, *p & 0xffff);
+	/* Upper 16 bit */
+	ihs_axi_set(priv->map, write_data_msb, (*p >> 16) & 0xffff);
+
+	ret = ihs_axi_transfer(dev, address, AXI_CMD_WRITE);
+	if (ret < 0) {
+		debug("%s: Error during AXI transfer (err = %d)\n",
+		      dev->name, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct udevice_id ihs_axi_ids[] = {
+	{ .compatible = "gdsys,ihs_axi" },
+	{ /* sentinel */ }
+};
+
+static const struct axi_ops ihs_axi_ops = {
+	.read = ihs_axi_read,
+	.write = ihs_axi_write,
+};
+
+static int ihs_axi_probe(struct udevice *dev)
+{
+	struct ihs_axi_priv *priv = dev_get_priv(dev);
+
+	regmap_init_mem(dev_ofnode(dev), &priv->map);
+
+	return 0;
+}
+
+U_BOOT_DRIVER(ihs_axi_bus) = {
+	.name           = "ihs_axi_bus",
+	.id             = UCLASS_AXI,
+	.of_match       = ihs_axi_ids,
+	.ops		= &ihs_axi_ops,
+	.priv_auto_alloc_size = sizeof(struct ihs_axi_priv),
+	.probe          = ihs_axi_probe,
+};

drivers/axi/sandbox_store.c

@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+
+/**
+ * struct sandbox_store_priv - Private data structure of a AXI store device
+ * @store: The buffer holding the device's internal memory, which is read from
+ *	   and written to using the driver's methods
+ */
+struct sandbox_store_priv {
+	u8 *store;
+};
+
+/**
+ * copy_axi_data() - Copy data from source to destination with a given AXI
+ *		     transfer width
+ * @src:  Pointer to the data source from where data will be read
+ * @dst:  Pointer to the data destination where data will be written to
+ * @size: Size of the data to be copied given by a axi_size_t enum value
+ *
+ * Return: 0 if OK, -ve on error
+ */
+static int copy_axi_data(void *src, void *dst, enum axi_size_t size)
+{
+	switch (size) {
+	case AXI_SIZE_8:
+		*((u8 *)dst) = *((u8 *)src);
+		return 0;
+	case AXI_SIZE_16:
+		*((u16 *)dst) = be16_to_cpu(*((u16 *)src));
+		return 0;
+	case AXI_SIZE_32:
+		*((u32 *)dst) = be32_to_cpu(*((u32 *)src));
+		return 0;
+	default:
+		debug("%s: Unknown AXI transfer size '%d'\n", __func__, size);
+		return -EINVAL;
+	}
+}
+
+static int sandbox_store_read(struct udevice *dev, ulong address, void *data,
+			      enum axi_size_t size)
+{
+	struct sandbox_store_priv *priv = dev_get_priv(dev);
+
+	return copy_axi_data(priv->store + address, data, size);
+}
+
+static int sandbox_store_write(struct udevice *dev, ulong address, void *data,
+			       enum axi_size_t size)
+{
+	struct sandbox_store_priv *priv = dev_get_priv(dev);
+
+	return copy_axi_data(data, priv->store + address, size);
+}
+
+static int sandbox_store_get_store(struct udevice *dev, u8 **store)
+{
+	struct sandbox_store_priv *priv = dev_get_priv(dev);
+
+	*store = priv->store;
+
+	return 0;
+}
+
+static const struct udevice_id sandbox_store_ids[] = {
+	{ .compatible = "sandbox,sandbox_store" },
+	{ /* sentinel */ }
+};
+
+static const struct axi_emul_ops sandbox_store_ops = {
+	.read = sandbox_store_read,
+	.write = sandbox_store_write,
+	.get_store = sandbox_store_get_store,
+};
+
+static int sandbox_store_probe(struct udevice *dev)
+{
+	struct sandbox_store_priv *priv = dev_get_priv(dev);
+	u32 reg[2];
+	int ret;
+
+	ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg));
+	if (ret) {
+		debug("%s: Could not read 'reg' property\n", dev->name);
+		return -EINVAL;
+	}
+
+	/*
+	 * Allocate the device's internal storage that will be read
+	 * from/written to
+	 */
+	priv->store = calloc(reg[1], 1);
+	if (!priv->store)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int sandbox_store_remove(struct udevice *dev)
+{
+	struct sandbox_store_priv *priv = dev_get_priv(dev);
+
+	free(priv->store);
+
+	return 0;
+}
+
+U_BOOT_DRIVER(sandbox_axi_store) = {
+	.name           = "sandbox_axi_store",
+	.id             = UCLASS_AXI_EMUL,
+	.of_match       = sandbox_store_ids,
+	.ops		= &sandbox_store_ops,
+	.priv_auto_alloc_size = sizeof(struct sandbox_store_priv),
+	.probe          = sandbox_store_probe,
+	.remove		= sandbox_store_remove,
+};

drivers/video/Kconfig

@@ -431,6 +431,17 @@ config ATMEL_HLCD
 	help
 	   HLCDC supports video output to an attached LCD panel.
 
+config LOGICORE_DP_TX
+	bool "Enable Logicore DP TX driver"
+	depends on DISPLAY
+	help
+	  Enable the driver for the transmitter part of the Xilinx LogiCORE
+	  DisplayPort, a IP core for Xilinx FPGAs that implements a DisplayPort
+	  video interface as defined by VESA DisplayPort v1.2.
+
+	  Note that this is a pure transmitter device, and has no display
+	  capabilities by itself.
+
 config VIDEO_BROADWELL_IGD
 	bool "Enable Intel Broadwell integrated graphics device"
 	depends on X86

drivers/video/Makefile

@@ -4,57 +4,58 @@
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
 ifdef CONFIG_DM
+obj-$(CONFIG_BACKLIGHT_GPIO) += backlight_gpio.o
+obj-$(CONFIG_BACKLIGHT_PWM) += pwm_backlight.o
+obj-$(CONFIG_CONSOLE_NORMAL) += console_normal.o
+obj-$(CONFIG_CONSOLE_ROTATION) += console_rotate.o
+obj-$(CONFIG_CONSOLE_TRUETYPE) += console_truetype.o fonts/
 obj-$(CONFIG_DISPLAY) += display-uclass.o
 obj-$(CONFIG_DM_VIDEO) += backlight-uclass.o
 obj-$(CONFIG_DM_VIDEO) += panel-uclass.o simple_panel.o
 obj-$(CONFIG_DM_VIDEO) += video-uclass.o vidconsole-uclass.o
 obj-$(CONFIG_DM_VIDEO) += video_bmp.o
-obj-$(CONFIG_BACKLIGHT_PWM) += pwm_backlight.o
-obj-$(CONFIG_BACKLIGHT_GPIO) += backlight_gpio.o
-obj-$(CONFIG_CONSOLE_NORMAL) += console_normal.o
-obj-$(CONFIG_CONSOLE_ROTATION) += console_rotate.o
-obj-$(CONFIG_CONSOLE_TRUETYPE) += console_truetype.o fonts/
 endif
 
-obj-$(CONFIG_VIDEO_BROADWELL_IGD) += broadwell_igd.o
-obj-$(CONFIG_VIDEO_IVYBRIDGE_IGD) += ivybridge_igd.o
+obj-${CONFIG_EXYNOS_FB} += exynos/
+obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/
+obj-${CONFIG_VIDEO_STM32} += stm32/
+obj-${CONFIG_VIDEO_TEGRA124} += tegra124/
 
+obj-$(CONFIG_AM335X_LCD) += am335x-fb.o
 obj-$(CONFIG_ATI_RADEON_FB) += ati_radeon_fb.o videomodes.o
 obj-$(CONFIG_ATMEL_HLCD) += atmel_hlcdfb.o
 obj-$(CONFIG_ATMEL_LCD) += atmel_lcdfb.o
 obj-$(CONFIG_CFB_CONSOLE) += cfb_console.o
+obj-$(CONFIG_FORMIKE) += formike.o
 obj-$(CONFIG_FSL_DIU_FB) += fsl_diu_fb.o videomodes.o
-obj-$(CONFIG_VIDEO_FSL_DCU_FB) += fsl_dcu_fb.o videomodes.o
+obj-$(CONFIG_LD9040) += ld9040.o
+obj-$(CONFIG_LG4573) += lg4573.o
+obj-$(CONFIG_LOGICORE_DP_TX) += logicore_dp_tx.o
 obj-$(CONFIG_PXA_LCD) += pxa_lcd.o
-obj-$(CONFIG_SCF0403_LCD) += scf0403_lcd.o
 obj-$(CONFIG_S6E8AX0) += s6e8ax0.o
-obj-$(CONFIG_LD9040) += ld9040.o
+obj-$(CONFIG_SCF0403_LCD) += scf0403_lcd.o
 obj-$(CONFIG_VIDEO_BCM2835) += bcm2835.o
+obj-$(CONFIG_VIDEO_BROADWELL_IGD) += broadwell_igd.o
 obj-$(CONFIG_VIDEO_COREBOOT) += coreboot.o
 obj-$(CONFIG_VIDEO_DA8XX) += da8xx-fb.o videomodes.o
+obj-$(CONFIG_VIDEO_DW_HDMI) += dw_hdmi.o
 obj-$(CONFIG_VIDEO_EFI) += efi.o
+obj-$(CONFIG_VIDEO_FSL_DCU_FB) += fsl_dcu_fb.o videomodes.o
+obj-$(CONFIG_VIDEO_IPUV3) += mxc_ipuv3_fb.o ipu_common.o ipu_disp.o
+obj-$(CONFIG_VIDEO_IVYBRIDGE_IGD) += ivybridge_igd.o
 obj-$(CONFIG_VIDEO_LCD_ANX9804) += anx9804.o
 obj-$(CONFIG_VIDEO_LCD_HITACHI_TX18D42VM) += hitachi_tx18d42vm_lcd.o
 obj-$(CONFIG_VIDEO_LCD_SSD2828) += ssd2828.o
 obj-$(CONFIG_VIDEO_MB862xx) += mb862xx.o videomodes.o
-obj-$(CONFIG_VIDEO_MX3) += mx3fb.o videomodes.o
-obj-$(CONFIG_VIDEO_IPUV3) += mxc_ipuv3_fb.o ipu_common.o ipu_disp.o
 obj-$(CONFIG_VIDEO_MVEBU) += mvebu_lcd.o
+obj-$(CONFIG_VIDEO_MX3) += mx3fb.o videomodes.o
 obj-$(CONFIG_VIDEO_MXS) += mxsfb.o videomodes.o
 obj-$(CONFIG_VIDEO_OMAP3) += omap3_dss.o
 obj-$(CONFIG_VIDEO_SANDBOX_SDL) += sandbox_sdl.o
+obj-$(CONFIG_VIDEO_SIMPLE) += simplefb.o
 obj-$(CONFIG_VIDEO_TEGRA20) += tegra.o
 obj-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o
 obj-$(CONFIG_VIDEO_VESA) += vesa.o
-obj-$(CONFIG_FORMIKE) += formike.o
-obj-$(CONFIG_LG4573) += lg4573.o
-obj-$(CONFIG_AM335X_LCD) += am335x-fb.o
-obj-$(CONFIG_VIDEO_DW_HDMI) += dw_hdmi.o
-obj-$(CONFIG_VIDEO_SIMPLE) += simplefb.o
-obj-${CONFIG_VIDEO_TEGRA124} += tegra124/
-obj-${CONFIG_EXYNOS_FB} += exynos/
-obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/
-obj-${CONFIG_VIDEO_STM32} += stm32/
 
 obj-y += bridge/
 obj-y += sunxi/

drivers/video/logicore_dp_dpcd.h

@@ -0,0 +1,341 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * logicore_dp_dpcd.h
+ *
+ * DPCD interface definition for XILINX LogiCore DisplayPort v6.1
+ * based on Xilinx dp_v3_1 driver sources
+ *
+ * (C) Copyright 2016
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
+ */
+
+#ifndef __GDSYS_LOGICORE_DP_DPCD_H__
+#define __GDSYS_LOGICORE_DP_DPCD_H__
+
+/* receiver capability field */
+#define DPCD_REV						0x00000
+#define DPCD_MAX_LINK_RATE					0x00001
+#define DPCD_MAX_LANE_COUNT					0x00002
+#define DPCD_MAX_DOWNSPREAD					0x00003
+#define DPCD_NORP_PWR_V_CAP					0x00004
+#define DPCD_DOWNSP_PRESENT					0x00005
+#define DPCD_ML_CH_CODING_CAP					0x00006
+#define DPCD_DOWNSP_COUNT_MSA_OUI				0x00007
+#define	DPCD_RX_PORT0_CAP_0					0x00008
+#define	DPCD_RX_PORT0_CAP_1					0x00009
+#define	DPCD_RX_PORT1_CAP_0					0x0000A
+#define	DPCD_RX_PORT1_CAP_1					0x0000B
+#define DPCD_I2C_SPEED_CTL_CAP					0x0000C
+#define DPCD_EDP_CFG_CAP					0x0000D
+#define DPCD_TRAIN_AUX_RD_INTERVAL				0x0000E
+#define DPCD_ADAPTER_CAP					0x0000F
+#define DPCD_FAUX_CAP						0x00020
+#define DPCD_MSTM_CAP						0x00021
+#define DPCD_NUM_AUDIO_EPS					0x00022
+#define	DPCD_AV_GRANULARITY					0x00023
+#define DPCD_AUD_DEC_LAT_7_0					0x00024
+#define DPCD_AUD_DEC_LAT_15_8					0x00025
+#define DPCD_AUD_PP_LAT_7_0					0x00026
+#define DPCD_AUD_PP_LAT_15_8					0x00027
+#define DPCD_VID_INTER_LAT					0x00028
+#define DPCD_VID_PROG_LAT					0x00029
+#define DPCD_REP_LAT						0x0002A
+#define DPCD_AUD_DEL_INS_7_0					0x0002B
+#define DPCD_AUD_DEL_INS_15_8					0x0002C
+#define DPCD_AUD_DEL_INS_23_16					0x0002D
+#define DPCD_GUID						0x00030
+#define DPCD_RX_GTC_VALUE_7_0					0x00054
+#define DPCD_RX_GTC_VALUE_15_8					0x00055
+#define DPCD_RX_GTC_VALUE_23_16					0x00056
+#define DPCD_RX_GTC_VALUE_31_24					0x00057
+#define DPCD_RX_GTC_MSTR_REQ					0x00058
+#define DPCD_RX_GTC_FREQ_LOCK_DONE				0x00059
+#define DPCD_DOWNSP_0_CAP					0x00080
+#define DPCD_DOWNSP_1_CAP					0x00081
+#define DPCD_DOWNSP_2_CAP					0x00082
+#define DPCD_DOWNSP_3_CAP					0x00083
+#define DPCD_DOWNSP_0_DET_CAP					0x00080
+#define DPCD_DOWNSP_1_DET_CAP					0x00084
+#define DPCD_DOWNSP_2_DET_CAP					0x00088
+#define DPCD_DOWNSP_3_DET_CAP					0x0008C
+
+/* link configuration field */
+#define DPCD_LINK_BW_SET					0x00100
+#define DPCD_LANE_COUNT_SET					0x00101
+#define DPCD_TP_SET						0x00102
+#define DPCD_TRAINING_LANE0_SET					0x00103
+#define DPCD_TRAINING_LANE1_SET					0x00104
+#define DPCD_TRAINING_LANE2_SET					0x00105
+#define DPCD_TRAINING_LANE3_SET					0x00106
+#define DPCD_DOWNSPREAD_CTRL					0x00107
+#define DPCD_ML_CH_CODING_SET					0x00108
+#define DPCD_I2C_SPEED_CTL_SET					0x00109
+#define DPCD_EDP_CFG_SET					0x0010A
+#define DPCD_LINK_QUAL_LANE0_SET				0x0010B
+#define DPCD_LINK_QUAL_LANE1_SET				0x0010C
+#define DPCD_LINK_QUAL_LANE2_SET				0x0010D
+#define DPCD_LINK_QUAL_LANE3_SET				0x0010E
+#define DPCD_TRAINING_LANE0_1_SET2				0x0010F
+#define DPCD_TRAINING_LANE2_3_SET2				0x00110
+#define DPCD_MSTM_CTRL						0x00111
+#define DPCD_AUDIO_DELAY_7_0					0x00112
+#define DPCD_AUDIO_DELAY_15_8					0x00113
+#define DPCD_AUDIO_DELAY_23_6					0x00114
+#define DPCD_UPSTREAM_DEVICE_DP_PWR_NEED			0x00118
+#define DPCD_FAUX_MODE_CTRL					0x00120
+#define DPCD_FAUX_FORWARD_CH_DRIVE_SET				0x00121
+#define DPCD_BACK_CH_STATUS					0x00122
+#define DPCD_FAUX_BACK_CH_SYMBOL_ERROR_COUNT			0x00123
+#define DPCD_FAUX_BACK_CH_TRAINING_PATTERN_TIME			0x00125
+#define DPCD_TX_GTC_VALUE_7_0					0x00154
+#define DPCD_TX_GTC_VALUE_15_8					0x00155
+#define DPCD_TX_GTC_VALUE_23_16					0x00156
+#define DPCD_TX_GTC_VALUE_31_24					0x00157
+#define DPCD_RX_GTC_VALUE_PHASE_SKEW_EN				0x00158
+#define DPCD_TX_GTC_FREQ_LOCK_DONE				0x00159
+#define DPCD_ADAPTER_CTRL					0x001A0
+#define DPCD_BRANCH_DEVICE_CTRL					0x001A1
+#define DPCD_PAYLOAD_ALLOCATE_SET				0x001C0
+#define DPCD_PAYLOAD_ALLOCATE_START_TIME_SLOT			0x001C1
+#define DPCD_PAYLOAD_ALLOCATE_TIME_SLOT_COUNT			0x001C2
+
+/* link/sink status field */
+#define DPCD_SINK_COUNT						0x00200
+#define DPCD_DEVICE_SERVICE_IRQ					0x00201
+#define DPCD_STATUS_LANE_0_1					0x00202
+#define DPCD_STATUS_LANE_2_3					0x00203
+#define DPCD_LANE_ALIGN_STATUS_UPDATED				0x00204
+#define DPCD_SINK_STATUS					0x00205
+#define DPCD_ADJ_REQ_LANE_0_1					0x00206
+#define DPCD_ADJ_REQ_LANE_2_3					0x00207
+#define DPCD_TRAINING_SCORE_LANE_0				0x00208
+#define DPCD_TRAINING_SCORE_LANE_1				0x00209
+#define DPCD_TRAINING_SCORE_LANE_2				0x0020A
+#define DPCD_TRAINING_SCORE_LANE_3				0x0020B
+#define DPCD_ADJ_REQ_PC2					0x0020C
+#define DPCD_FAUX_FORWARD_CH_SYMBOL_ERROR_COUNT			0x0020D
+#define DPCD_SYMBOL_ERROR_COUNT_LANE_0				0x00210
+#define DPCD_SYMBOL_ERROR_COUNT_LANE_1				0x00212
+#define DPCD_SYMBOL_ERROR_COUNT_LANE_2				0x00214
+#define DPCD_SYMBOL_ERROR_COUNT_LANE_3				0x00216
+
+/* automated testing sub-field */
+#define DPCD_FAUX_FORWARD_CH_STATUS				0x00280
+#define DPCD_FAUX_BACK_CH_DRIVE_SET				0x00281
+#define DPCD_FAUX_BACK_CH_SYM_ERR_COUNT_CTRL			0x00282
+#define DPCD_PAYLOAD_TABLE_UPDATE_STATUS			0x002C0
+#define DPCD_VC_PAYLOAD_ID_SLOT(slotnum) \
+			(DPCD_PAYLOAD_TABLE_UPDATE_STATUS + slotnum)
+
+/* sink control field */
+#define DPCD_SET_POWER_DP_PWR_VOLTAGE				0x00600
+
+/* sideband message buffers */
+#define DPCD_DOWN_REQ						0x01000
+#define DPCD_UP_REP						0x01200
+#define DPCD_DOWN_REP						0x01400
+#define DPCD_UP_REQ						0x01600
+
+/* event status indicator field */
+#define DPCD_SINK_COUNT_ESI					0x02002
+#define DPCD_SINK_DEVICE_SERVICE_IRQ_VECTOR_ESI0		0x02003
+#define DPCD_SINK_DEVICE_SERVICE_IRQ_VECTOR_ESI1		0x02004
+#define DPCD_SINK_LINK_SERVICE_IRQ_VECTOR_ESI0			0x02005
+#define DPCD_SINK_LANE0_1_STATUS				0x0200C
+#define DPCD_SINK_LANE2_3_STATUS				0x0200D
+#define DPCD_SINK_ALIGN_STATUS_UPDATED_ESI			0x0200E
+#define DPCD_SINK_STATUS_ESI					0x0200F
+
+/*
+ * field addresses and sizes.
+ */
+#define DPCD_RECEIVER_CAP_FIELD_START				DPCD_REV
+#define DPCD_RECEIVER_CAP_FIELD_SIZE				0x100
+#define DPCD_LINK_CFG_FIELD_START				DPCD_LINK_BW_SET
+#define DPCD_LINK_CFG_FIELD_SIZE				0x100
+#define DPCD_LINK_SINK_STATUS_FIELD_START			DPCD_SINK_COUNT
+#define DPCD_LINK_SINK_STATUS_FIELD_SIZE			0x17
+/* 0x00000: DPCD_REV */
+#define DPCD_REV_MNR_MASK					0x0F
+#define DPCD_REV_MJR_MASK					0xF0
+#define DPCD_REV_MJR_SHIFT					4
+/* 0x00001: MAX_LINK_RATE */
+#define DPCD_MAX_LINK_RATE_162GBPS				0x06
+#define DPCD_MAX_LINK_RATE_270GBPS				0x0A
+#define DPCD_MAX_LINK_RATE_540GBPS				0x14
+/* 0x00002: MAX_LANE_COUNT */
+#define DPCD_MAX_LANE_COUNT_MASK				0x1F
+#define DPCD_MAX_LANE_COUNT_1					0x01
+#define DPCD_MAX_LANE_COUNT_2					0x02
+#define DPCD_MAX_LANE_COUNT_4					0x04
+#define DPCD_TPS3_SUPPORT_MASK					0x40
+#define DPCD_ENHANCED_FRAME_SUPPORT_MASK			0x80
+/* 0x00003: MAX_DOWNSPREAD */
+#define DPCD_MAX_DOWNSPREAD_MASK				0x01
+#define DPCD_NO_AUX_HANDSHAKE_LINK_TRAIN_MASK			0x40
+/* 0x00005: DOWNSP_PRESENT */
+#define DPCD_DOWNSP_PRESENT_MASK				0x01
+#define DPCD_DOWNSP_TYPE_MASK					0x06
+#define DPCD_DOWNSP_TYPE_SHIFT					1
+#define DPCD_DOWNSP_TYPE_DP					0x0
+#define DPCD_DOWNSP_TYPE_AVGA_ADVII				0x1
+#define DPCD_DOWNSP_TYPE_DVI_HDMI_DPPP				0x2
+#define DPCD_DOWNSP_TYPE_OTHERS					0x3
+#define DPCD_DOWNSP_FORMAT_CONV_MASK				0x08
+#define DPCD_DOWNSP_DCAP_INFO_AVAIL_MASK			0x10
+/* 0x00006, 0x00108: ML_CH_CODING_SUPPORT, ML_CH_CODING_SET */
+#define DPCD_ML_CH_CODING_MASK					0x01
+/* 0x00007: DOWNSP_COUNT_MSA_OUI */
+#define DPCD_DOWNSP_COUNT_MASK					0x0F
+#define DPCD_MSA_TIMING_PAR_IGNORED_MASK			0x40
+#define DPCD_OUI_SUPPORT_MASK					0x80
+/* 0x00008, 0x0000A: RX_PORT[0-1]_CAP_0 */
+#define DPCD_RX_PORTX_CAP_0_LOCAL_EDID_PRESENT_MASK		0x02
+#define DPCD_RX_PORTX_CAP_0_ASSOC_TO_PRECEDING_PORT_MASK	0x04
+/* 0x0000C, 0x00109: I2C_SPEED_CTL_CAP, I2C_SPEED_CTL_SET */
+#define DPCD_I2C_SPEED_CTL_NONE					0x00
+#define DPCD_I2C_SPEED_CTL_1KBIPS				0x01
+#define DPCD_I2C_SPEED_CTL_5KBIPS				0x02
+#define DPCD_I2C_SPEED_CTL_10KBIPS				0x04
+#define DPCD_I2C_SPEED_CTL_100KBIPS				0x08
+#define DPCD_I2C_SPEED_CTL_400KBIPS				0x10
+#define DPCD_I2C_SPEED_CTL_1MBIPS				0x20
+/* 0x0000E: TRAIN_AUX_RD_INTERVAL */
+#define DPCD_TRAIN_AUX_RD_INT_100_400US				0x00
+#define DPCD_TRAIN_AUX_RD_INT_4MS				0x01
+#define DPCD_TRAIN_AUX_RD_INT_8MS				0x02
+#define DPCD_TRAIN_AUX_RD_INT_12MS				0x03
+#define DPCD_TRAIN_AUX_RD_INT_16MS				0x04
+/* 0x00020: DPCD_FAUX_CAP */
+#define DPCD_FAUX_CAP_MASK					0x01
+/* 0x00021: MSTM_CAP */
+#define DPCD_MST_CAP_MASK					0x01
+/* 0x00080, 0x00081|4, 0x00082|8, 0x00083|C: DOWNSP_X_(DET_)CAP */
+#define DPCD_DOWNSP_X_CAP_TYPE_MASK				0x07
+#define DPCD_DOWNSP_X_CAP_TYPE_DP				0x0
+#define DPCD_DOWNSP_X_CAP_TYPE_AVGA				0x1
+#define DPCD_DOWNSP_X_CAP_TYPE_DVI				0x2
+#define DPCD_DOWNSP_X_CAP_TYPE_HDMI				0x3
+#define DPCD_DOWNSP_X_CAP_TYPE_OTHERS				0x4
+#define DPCD_DOWNSP_X_CAP_TYPE_DPPP				0x5
+#define DPCD_DOWNSP_X_CAP_HPD_MASK				0x80
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_MASK			0xF0
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_SHIFT			4
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_720_480_I_60		0x1
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_720_480_I_50		0x2
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_1920_1080_I_60		0x3
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_1920_1080_I_50		0x4
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_1280_720_P_60		0x5
+#define DPCD_DOWNSP_X_CAP_NON_EDID_ATTR_1280_720_P_50		0x7
+/* 0x00082, 0x00086, 0x0008A, 0x0008E: DOWNSP_X_(DET_)CAP2 */
+#define DPCD_DOWNSP_X_DCAP_MAX_BPC_MASK				0x03
+#define DPCD_DOWNSP_X_DCAP_MAX_BPC_8				0x0
+#define DPCD_DOWNSP_X_DCAP_MAX_BPC_10				0x1
+#define DPCD_DOWNSP_X_DCAP_MAX_BPC_12				0x2
+#define DPCD_DOWNSP_X_DCAP_MAX_BPC_16				0x3
+/* 0x00082, 0x00086, 0x0008A, 0x0008E: DOWNSP_X_(DET_)CAP2 */
+#define DPCD_DOWNSP_X_DCAP_HDMI_DPPP_FS2FP_MASK			0x01
+#define DPCD_DOWNSP_X_DCAP_DVI_DL_MASK				0x02
+#define DPCD_DOWNSP_X_DCAP_DVI_HCD_MASK				0x04
+
+/* link configuration field masks, shifts, and register values */
+/* 0x00100: DPCD_LINK_BW_SET */
+#define DPCD_LINK_BW_SET_162GBPS				0x06
+#define DPCD_LINK_BW_SET_270GBPS				0x0A
+#define DPCD_LINK_BW_SET_540GBPS				0x14
+/* 0x00101: LANE_COUNT_SET */
+#define DPCD_LANE_COUNT_SET_MASK				0x1F
+#define DPCD_LANE_COUNT_SET_1					0x01
+#define DPCD_LANE_COUNT_SET_2					0x02
+#define DPCD_LANE_COUNT_SET_4					0x04
+#define DPCD_ENHANCED_FRAME_EN_MASK				0x80
+/* 0x00102: TP_SET */
+#define DPCD_TP_SEL_MASK					0x03
+#define DPCD_TP_SEL_OFF						0x0
+#define DPCD_TP_SEL_TP1						0x1
+#define DPCD_TP_SEL_TP2						0x2
+#define DPCD_TP_SEL_TP3						0x3
+#define DPCD_TP_SET_LQP_MASK					0x06
+#define DPCD_TP_SET_LQP_SHIFT					2
+#define DPCD_TP_SET_LQP_OFF					0x0
+#define DPCD_TP_SET_LQP_D102_TEST				0x1
+#define DPCD_TP_SET_LQP_SER_MES					0x2
+#define DPCD_TP_SET_LQP_PRBS7					0x3
+#define DPCD_TP_SET_REC_CLK_OUT_EN_MASK				0x10
+#define DPCD_TP_SET_SCRAMB_DIS_MASK				0x20
+#define DPCD_TP_SET_SE_COUNT_SEL_MASK				0xC0
+#define DPCD_TP_SET_SE_COUNT_SEL_SHIFT				6
+#define DPCD_TP_SET_SE_COUNT_SEL_DE_ISE				0x0
+#define DPCD_TP_SET_SE_COUNT_SEL_DE				0x1
+#define DPCD_TP_SET_SE_COUNT_SEL_ISE				0x2
+/* 0x00103-0x00106: TRAINING_LANE[0-3]_SET */
+#define DPCD_TRAINING_LANEX_SET_VS_MASK				0x03
+#define DPCD_TRAINING_LANEX_SET_MAX_VS_MASK			0x04
+#define DPCD_TRAINING_LANEX_SET_PE_MASK				0x18
+#define DPCD_TRAINING_LANEX_SET_PE_SHIFT			3
+#define DPCD_TRAINING_LANEX_SET_MAX_PE_MASK			0x20
+/* 0x00107: DOWNSPREAD_CTRL */
+#define DPCD_SPREAD_AMP_MASK					0x10
+#define DPCD_MSA_TIMING_PAR_IGNORED_EN_MASK			0x80
+/* 0x00108: ML_CH_CODING_SET - Same as 0x00006: ML_CH_CODING_SUPPORT */
+/* 0x00109: I2C_SPEED_CTL_SET - Same as 0x0000C: I2C_SPEED_CTL_CAP */
+/* 0x0010F-0x00110: TRAINING_LANE[0_1-2_3]_SET2 */
+#define DPCD_TRAINING_LANE_0_2_SET_PC2_MASK			0x03
+#define DPCD_TRAINING_LANE_0_2_SET_MAX_PC2_MASK			0x04
+#define DPCD_TRAINING_LANE_1_3_SET_PC2_MASK			0x30
+#define DPCD_TRAINING_LANE_1_3_SET_PC2_SHIFT			4
+#define DPCD_TRAINING_LANE_1_3_SET_MAX_PC2_MASK			0x40
+/* 0x00111: MSTM_CTRL */
+#define DPCD_MST_EN_MASK					0x01
+#define DPCD_UP_REQ_EN_MASK					0x02
+#define DPCD_UP_IS_SRC_MASK					0x03
+
+/* link/sink status field masks, shifts, and register values */
+/* 0x00200: SINK_COUNT */
+#define DPCD_SINK_COUNT_LOW_MASK				0x3F
+#define DPCD_SINK_CP_READY_MASK					0x40
+#define DPCD_SINK_COUNT_HIGH_MASK				0x80
+#define DPCD_SINK_COUNT_HIGH_LOW_SHIFT				1
+/* 0x00202: STATUS_LANE_0_1 */
+#define DPCD_STATUS_LANE_0_CR_DONE_MASK				0x01
+#define DPCD_STATUS_LANE_0_CE_DONE_MASK				0x02
+#define DPCD_STATUS_LANE_0_SL_DONE_MASK				0x04
+#define DPCD_STATUS_LANE_1_CR_DONE_MASK				0x10
+#define DPCD_STATUS_LANE_1_CE_DONE_MASK				0x20
+#define DPCD_STATUS_LANE_1_SL_DONE_MASK				0x40
+/* 0x00202: STATUS_LANE_2_3 */
+#define DPCD_STATUS_LANE_2_CR_DONE_MASK				0x01
+#define DPCD_STATUS_LANE_2_CE_DONE_MASK				0x02
+#define DPCD_STATUS_LANE_2_SL_DONE_MASK				0x04
+#define DPCD_STATUS_LANE_3_CR_DONE_MASK				0x10
+#define DPCD_STATUS_LANE_3_CE_DONE_MASK				0x20
+#define DPCD_STATUS_LANE_3_SL_DONE_MASK				0x40
+/* 0x00204: LANE_ALIGN_STATUS_UPDATED */
+#define DPCD_LANE_ALIGN_STATUS_UPDATED_IA_DONE_MASK \
+								0x01
+#define DPCD_LANE_ALIGN_STATUS_UPDATED_DOWNSP_STATUS_CHANGED_MASK \
+								0x40
+#define DPCD_LANE_ALIGN_STATUS_UPDATED_LINK_STATUS_UPDATED_MASK \
+								0x80
+/* 0x00205: SINK_STATUS */
+#define DPCD_SINK_STATUS_RX_PORT0_SYNC_STATUS_MASK		0x01
+#define DPCD_SINK_STATUS_RX_PORT1_SYNC_STATUS_MASK		0x02
+
+/* 0x00206, 0x00207: ADJ_REQ_LANE_[0,2]_[1,3] */
+#define DPCD_ADJ_REQ_LANE_0_2_VS_MASK				0x03
+#define DPCD_ADJ_REQ_LANE_0_2_PE_MASK				0x0C
+#define DPCD_ADJ_REQ_LANE_0_2_PE_SHIFT				2
+#define DPCD_ADJ_REQ_LANE_1_3_VS_MASK				0x30
+#define DPCD_ADJ_REQ_LANE_1_3_VS_SHIFT				4
+#define DPCD_ADJ_REQ_LANE_1_3_PE_MASK				0xC0
+#define DPCD_ADJ_REQ_LANE_1_3_PE_SHIFT				6
+/* 0x0020C: ADJ_REQ_PC2 */
+#define DPCD_ADJ_REQ_PC2_LANE_0_MASK				0x03
+#define DPCD_ADJ_REQ_PC2_LANE_1_MASK				0x0C
+#define DPCD_ADJ_REQ_PC2_LANE_1_SHIFT				2
+#define DPCD_ADJ_REQ_PC2_LANE_2_MASK				0x30
+#define DPCD_ADJ_REQ_PC2_LANE_2_SHIFT				4
+#define DPCD_ADJ_REQ_PC2_LANE_3_MASK				0xC0
+#define DPCD_ADJ_REQ_PC2_LANE_3_SHIFT				6
+
+#endif /* __GDSYS_LOGICORE_DP_DPCD_H__ */

drivers/video/logicore_dp_tx.c

@@ -0,0 +1,2296 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * logicore_dp_tx.c
+ *
+ * Driver for XILINX LogiCore DisplayPort v6.1 TX (Source)
+ * based on Xilinx dp_v3_1 driver sources, updated to dp_v4_0
+ *
+ * (C) Copyright 2016
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <display.h>
+#include <dm.h>
+#include <errno.h>
+
+#include "axi.h"
+#include "logicore_dp_dpcd.h"
+#include "logicore_dp_tx.h"
+#include "logicore_dp_tx_regif.h"
+
+/* Default AXI clock frequency value */
+#define S_AXI_CLK_DEFAULT 100000000
+
+/* Default DP phy clock value */
+#define PHY_CLOCK_SELECT_DEFAULT PHY_CLOCK_SELECT_540GBPS
+
+/* The maximum voltage swing level is 3 */
+#define MAXIMUM_VS_LEVEL 3
+/* The maximum pre-emphasis level is 3 */
+#define MAXIMUM_PE_LEVEL 3
+
+/* Error out if an AUX request yields a defer reply more than 50 times */
+#define AUX_MAX_DEFER_COUNT 50
+/* Error out if an AUX request times out more than 50 times awaiting a reply */
+#define AUX_MAX_TIMEOUT_COUNT 50
+/* Error out if checking for a connected device times out more than 50 times */
+#define IS_CONNECTED_MAX_TIMEOUT_COUNT 50
+
+/**
+ * enum link_training_states - States for link training state machine
+ * @TS_CLOCK_RECOVERY:       State for clock recovery
+ * @TS_CHANNEL_EQUALIZATION: State for channel equalization
+ * @TS_ADJUST_LINK_RATE:     State where link rate is reduced in reaction to
+ *			     failed link training
+ * @TS_ADJUST_LANE_COUNT:    State where lane count is reduced in reaction to
+ *			     failed link training
+ * @TS_FAILURE:              State of link training failure
+ * @TS_SUCCESS::             State for successfully completed link training
+ */
+enum link_training_states {
+	TS_CLOCK_RECOVERY,
+	TS_CHANNEL_EQUALIZATION,
+	TS_ADJUST_LINK_RATE,
+	TS_ADJUST_LANE_COUNT,
+	TS_FAILURE,
+	TS_SUCCESS
+};
+
+/**
+ * struct aux_transaction - Description of an AUX channel transaction
+ * @cmd_code:  Command code of the transaction
+ * @num_bytes: The number of bytes in the transaction's payload data
+ * @address:   The DPCD address of the transaction
+ * @data:      Payload data of the AUX channel transaction
+ */
+struct aux_transaction {
+	u16 cmd_code;
+	u8 num_bytes;
+	u32 address;
+	u8 *data;
+};
+
+/**
+ * struct main_stream_attributes - Main stream attributes
+ * @pixel_clock_hz: Pixel clock of the stream (in Hz)
+ * @misc_0:                    Miscellaneous stream attributes 0 as specified
+ *			       by the DisplayPort 1.2 specification
+ * @misc_1:                    Miscellaneous stream attributes 1 as specified
+ *			       by the DisplayPort 1.2 specification
+ * @n_vid:                     N value for the video stream
+ * @m_vid:                     M value used to recover the video clock from the
+ *			       link clock
+ * @user_pixel_width:          Width of the user data input port
+ * @data_per_lane:             Used to translate the number of pixels per line
+ *			       to the native internal 16-bit datapath
+ * @avg_bytes_per_tu:          Average number of bytes per transfer unit,
+ *			       scaled up by a factor of 1000
+ * @transfer_unit_size:        Size of the transfer unit in the framing logic
+ *			       In MST mode, this is also the number of time
+ *			       slots that are alloted in the payload ID table
+ * @init_wait:                 Number of initial wait cycles at the start of a
+ *			       new line by the framing logic
+ * @bits_per_color:            Bits per color component
+ * @component_format:          The component format currently in use by the
+ *			       video stream
+ * @dynamic_range:             The dynamic range currently in use by the video
+ *			       stream
+ * @y_cb_cr_colorimetry:       The YCbCr colorimetry currently in use by the
+ *			       video stream
+ * @synchronous_clock_mode:    Synchronous clock mode is currently in use by
+ *			       the video stream
+ * @override_user_pixel_width: If set to 1, the value stored for
+ *			       user_pixel_width will be used as the pixel width
+ * @h_start:                   Horizontal blank start (pixels)
+ * @h_active:                  Horizontal active resolution (pixels)
+ * @h_sync_width:              Horizontal sync width (pixels)
+ * @h_total:                   Horizontal total (pixels)
+ * @h_sync_polarity:           Horizontal sync polarity (0=neg|1=pos)
+ * @v_start:                   Vertical blank start (in lines)
+ * @v_active:                  Vertical active resolution (lines)
+ * @v_sync_width:              Vertical sync width (lines)
+ * @v_total:                   Vertical total (lines)
+ * @v_sync_polarity:           Vertical sync polarity (0=neg|1=pos)
+ *
+ * All porch parameters have been removed, because our videodata is
+ * hstart/vstart based, and there is no benefit in keeping the porches
+ */
+struct main_stream_attributes {
+	u32 pixel_clock_hz;
+	u32 misc_0;
+	u32 misc_1;
+	u32 n_vid;
+	//u32 m_vid;
+	u32 user_pixel_width;
+	u32 data_per_lane;
+	u32 avg_bytes_per_tu;
+	u32 transfer_unit_size;
+	u32 init_wait;
+	u32 bits_per_color;
+	u8 component_format;
+	u8 dynamic_range;
+	u8 y_cb_cr_colorimetry;
+	u8 synchronous_clock_mode;
+	u8 override_user_pixel_width;
+	u32 h_start;
+	u16 h_active;
+	u16 h_sync_width;
+	u16 h_total;
+	bool h_sync_polarity;
+	u32 v_start;
+	u16 v_active;
+	u16 v_sync_width;
+	u16 v_total;
+	bool v_sync_polarity;
+};
+
+/**
+ * struct link_config - Description of link configuration
+ * @lane_count:                    Currently selected lane count for this link
+ * @link_rate:                     Currently selected link rate for this link
+ * @scrambler_en:                  Flag to determine whether the scrambler is
+ *				   enabled for this link
+ * @enhanced_framing_mode:         Flag to determine whether enhanced framing
+ *				   mode is active for this link
+ * @max_lane_count:                Maximum lane count for this link
+ * @max_link_rate:                 Maximum link rate for this link
+ * @support_enhanced_framing_mode: Flag to indicate whether the link supports
+ *				   enhanced framing mode
+ * @vs_level:                      Voltage swing for each lane
+ * @pe_level:                      Pre-emphasis/cursor level for each lane
+ */
+struct link_config {
+	u8 lane_count;
+	u8 link_rate;
+	bool scrambler_en;
+	bool enhanced_framing_mode;
+	u8 max_lane_count;
+	u8 max_link_rate;
+	bool support_enhanced_framing_mode;
+	u8 vs_level;
+	u8 pe_level;
+};
+
+/**
+ * struct dp_tx - Private data structure of LogiCore DP TX devices
+ *
+ * @base:                   Address of register base of device
+ * @s_axi_clk:              The AXI clock frequency in Hz
+ * @train_adaptive:         Use adaptive link trainig (i.e. successively reduce
+ *			    link rate and/or lane count) for this device
+ * @max_link_rate:          Maximum link rate for this device
+ * @max_lane_count:         Maximum lane count for this device
+ * @dpcd_rx_caps:           RX device's status registers, see below
+ * @lane_status_ajd_reqs:   Lane status and adjustment requests information for
+ *			    this device
+ * @link_config:            The link configuration for this device
+ * @main_stream_attributes: MSA set for this device
+ *
+ * dpcd_rx_caps is a raw read of the RX device's status registers. The first 4
+ * bytes correspond to the lane status associated with clock recovery, channel
+ * equalization, symbol lock, and interlane alignment. The remaining 2 bytes
+ * represent the pre-emphasis and voltage swing level adjustments requested by
+ * the RX device.
+ */
+struct dp_tx {
+	u32 base;
+	u32 s_axi_clk;
+	bool train_adaptive;
+	u8 max_link_rate;
+	u8 max_lane_count;
+	u8 dpcd_rx_caps[16];
+	u8 lane_status_ajd_reqs[6];
+	struct link_config link_config;
+	struct main_stream_attributes main_stream_attributes;
+};
+
+/*
+ * Internal API
+ */
+
+/**
+ * get_reg() - Read a register of a LogiCore DP TX device
+ * @dev: The LogiCore DP TX device in question
+ * @reg: The offset of the register to read
+ *
+ * Return: The read register value
+ */
+static u32 get_reg(struct udevice *dev, u32 reg)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u32 value = 0;
+	int res;
+
+	/* TODO(mario.six@gdsys.cc): error handling */
+	res = axi_read(dev->parent, dp_tx->base + reg, &value, AXI_SIZE_32);
+	if (res < 0)
+		printf("%s() failed; res = %d\n", __func__, res);
+
+	return value;
+}
+
+/**
+ * set_reg() - Write a register of a LogiCore DP TX device
+ * @dev:   The LogiCore DP TX device in question
+ * @reg:   The offset of the register to write
+ * @value: The value to write to the register
+ */
+static void set_reg(struct udevice *dev, u32 reg, u32 value)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+
+	axi_write(dev->parent, dp_tx->base + reg, &value, AXI_SIZE_32);
+}
+
+/**
+ * is_connected() - Check if there is a connected RX device
+ * @dev: The LogiCore DP TX device in question
+ *
+ * The Xilinx original calls msleep_interruptible at least once, ignoring
+ * status.
+ *
+ * Return: true if a connected RX device was detected, false otherwise
+ */
+static bool is_connected(struct udevice *dev)
+{
+	u8 retries = 0;
+
+	do {
+		int status = get_reg(dev, REG_INTERRUPT_SIG_STATE) &
+			     INTERRUPT_SIG_STATE_HPD_STATE_MASK;
+		if (status)
+			return true;
+
+		udelay(1000);
+	} while (retries++ < IS_CONNECTED_MAX_TIMEOUT_COUNT);
+
+	return false;
+}
+
+/**
+ * wait_phy_ready() - Wait for the DisplayPort PHY to come out of reset
+ * @dev:  The LogiCore DP TX device in question
+ * @mask: Bit mask specifying which bit in the status register should be waited
+ *	  for
+ *
+ * Return: 0 if wait succeeded, -ve if error occurred
+ */
+static int wait_phy_ready(struct udevice *dev, u32 mask)
+{
+	u16 timeout = 20000;
+	u32 phy_status;
+
+	/* Wait until the PHY is ready. */
+	do {
+		phy_status = get_reg(dev, REG_PHY_STATUS) & mask;
+
+		/* Protect against an infinite loop. */
+		if (!timeout--)
+			return -ETIMEDOUT;
+
+		udelay(20);
+	} while (phy_status != mask);
+
+	return 0;
+}
+
+/* AUX channel access */
+
+/**
+ * aux_wait_ready() -  Wait until another request is no longer in progress
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Return: 0 if wait succeeded, -ve if error occurred
+ */
+static int aux_wait_ready(struct udevice *dev)
+{
+	int status;
+	u32 timeout = 100;
+
+	/* Wait until the DisplayPort TX core is ready. */
+	do {
+		status = get_reg(dev, REG_INTERRUPT_SIG_STATE);
+
+		/* Protect against an infinite loop. */
+		if (!timeout--)
+			return -ETIMEDOUT;
+		udelay(20);
+	} while (status & REPLY_STATUS_REPLY_IN_PROGRESS_MASK);
+
+	return 0;
+}
+
+/**
+ * aux_wait_reply() - Wait for reply on AUX channel
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Wait for a reply indicating that the most recent AUX request
+ * has been received by the RX device.
+ *
+ * Return: 0 if wait succeeded, -ve if error occurred
+ */
+static int aux_wait_reply(struct udevice *dev)
+{
+	u32 timeout = 100;
+
+	while (timeout > 0) {
+		int status = get_reg(dev, REG_REPLY_STATUS);
+
+		/* Check for error. */
+		if (status & REPLY_STATUS_REPLY_ERROR_MASK)
+			return -ETIMEDOUT;
+
+		/* Check for a reply. */
+		if ((status & REPLY_STATUS_REPLY_RECEIVED_MASK) &&
+		    !(status &
+		      REPLY_STATUS_REQUEST_IN_PROGRESS_MASK) &&
+		    !(status &
+		      REPLY_STATUS_REPLY_IN_PROGRESS_MASK)) {
+			return 0;
+		}
+
+		timeout--;
+		udelay(20);
+	}
+
+	return -ETIMEDOUT;
+}
+
+/**
+ * aux_request_send() - Send request on the AUX channel
+ * @dev:     The LogiCore DP TX device in question
+ * @request: The request to send
+ *
+ * Submit the supplied AUX request to the RX device over the AUX
+ * channel by writing the command, the destination address, (the write buffer
+ * for write commands), and the data size to the DisplayPort TX core.
+ *
+ * This is the lower-level sending routine, which is called by aux_request().
+ *
+ * Return: 0 if request was sent successfully, -ve on error
+ */
+static int aux_request_send(struct udevice *dev,
+			    struct aux_transaction *request)
+{
+	u32 timeout_count;
+	int status;
+	u8 index;
+
+	/* Ensure that any pending AUX transactions have completed. */
+	timeout_count = 0;
+	do {
+		status = get_reg(dev, REG_REPLY_STATUS);
+
+		udelay(20);
+		timeout_count++;
+		if (timeout_count >= AUX_MAX_TIMEOUT_COUNT)
+			return -ETIMEDOUT;
+	} while ((status & REPLY_STATUS_REQUEST_IN_PROGRESS_MASK) ||
+		 (status & REPLY_STATUS_REPLY_IN_PROGRESS_MASK));
+
+	set_reg(dev, REG_AUX_ADDRESS, request->address);
+
+	if (request->cmd_code == AUX_CMD_WRITE ||
+	    request->cmd_code == AUX_CMD_I2C_WRITE ||
+	    request->cmd_code == AUX_CMD_I2C_WRITE_MOT) {
+		/* Feed write data into the DisplayPort TX core's write FIFO. */
+		for (index = 0; index < request->num_bytes; index++) {
+			set_reg(dev,
+				REG_AUX_WRITE_FIFO, request->data[index]);
+		}
+	}
+
+	/* Submit the command and the data size. */
+	set_reg(dev, REG_AUX_CMD,
+		((request->cmd_code << AUX_CMD_SHIFT) |
+		 ((request->num_bytes - 1) &
+		  AUX_CMD_NBYTES_TRANSFER_MASK)));
+
+	/* Check for a reply from the RX device to the submitted request. */
+	status = aux_wait_reply(dev);
+	if (status)
+		/* Waiting for a reply timed out. */
+		return -ETIMEDOUT;
+
+	/* Analyze the reply. */
+	status = get_reg(dev, REG_AUX_REPLY_CODE);
+	if (status == AUX_REPLY_CODE_DEFER ||
+	    status == AUX_REPLY_CODE_I2C_DEFER) {
+		/* The request was deferred. */
+		return -EAGAIN;
+	} else if ((status == AUX_REPLY_CODE_NACK) ||
+		   (status == AUX_REPLY_CODE_I2C_NACK)) {
+		/* The request was not acknowledged. */
+		return -EIO;
+	}
+
+	/* The request was acknowledged. */
+
+	if (request->cmd_code == AUX_CMD_READ ||
+	    request->cmd_code == AUX_CMD_I2C_READ ||
+	    request->cmd_code == AUX_CMD_I2C_READ_MOT) {
+		/* Wait until all data has been received. */
+		timeout_count = 0;
+		do {
+			status = get_reg(dev, REG_REPLY_DATA_COUNT);
+
+			udelay(100);
+			timeout_count++;
+			if (timeout_count >= AUX_MAX_TIMEOUT_COUNT)
+				return -ETIMEDOUT;
+		} while (status != request->num_bytes);
+
+		/* Obtain the read data from the reply FIFO. */
+		for (index = 0; index < request->num_bytes; index++)
+			request->data[index] = get_reg(dev, REG_AUX_REPLY_DATA);
+	}
+
+	return 0;
+}
+
+/**
+ * aux_request() - Submit request on the AUX channel
+ * @dev:     The LogiCore DP TX device in question
+ * @request: The request to submit
+ *
+ * Submit the supplied AUX request to the RX device over the AUX
+ * channel. If waiting for a reply times out, or if the DisplayPort TX core
+ * indicates that the request was deferred, the request is sent again (up to a
+ * maximum specified by AUX_MAX_DEFER_COUNT|AUX_MAX_TIMEOUT_COUNT).
+ *
+ * Return: 0 if request was submitted successfully, -ve on error
+ */
+static int aux_request(struct udevice *dev, struct aux_transaction *request)
+{
+	u32 defer_count = 0;
+	u32 timeout_count = 0;
+
+	while ((defer_count < AUX_MAX_DEFER_COUNT) &&
+	       (timeout_count < AUX_MAX_TIMEOUT_COUNT)) {
+		int status = aux_wait_ready(dev);
+
+		if (status) {
+			/* The RX device isn't ready yet. */
+			timeout_count++;
+			continue;
+		}
+
+		status = aux_request_send(dev, request);
+		if (status == -EAGAIN) {
+			/* The request was deferred. */
+			defer_count++;
+		} else if (status == -ETIMEDOUT) {
+			/* Waiting for a reply timed out. */
+			timeout_count++;
+		} else {
+			/*
+			 * -EIO indicates that the request was NACK'ed,
+			 * 0 indicates that the request was ACK'ed.
+			 */
+			return status;
+		}
+
+		udelay(100);
+	}
+
+	/* The request was not successfully received by the RX device. */
+	return -ETIMEDOUT;
+}
+
+/**
+ * aux_common() - Common (read/write) AUX communication transmission
+ * @dev:       The LogiCore DP TX device in question
+ * @cmd_type:  Command code of the transaction
+ * @address:   The DPCD address of the transaction
+ * @num_bytes: Number of bytes in the payload data
+ * @data:      The payload data of the AUX command
+ *
+ * Common sequence of submitting an AUX command for AUX read, AUX write,
+ * I2C-over-AUX read, and I2C-over-AUX write transactions. If required, the
+ * reads and writes are split into multiple requests, each acting on a maximum
+ * of 16 bytes.
+ *
+ * Return: 0 if OK, -ve on error
+ */
+static int aux_common(struct udevice *dev, u32 cmd_type, u32 address,
+		      u32 num_bytes, u8 *data)
+{
+	struct aux_transaction request;
+	u32 bytes_left;
+
+	/*
+	 * Set the start address for AUX transactions. For I2C transactions,
+	 * this is the address of the I2C bus.
+	 */
+	request.address = address;
+
+	bytes_left = num_bytes;
+	while (bytes_left) {
+		int status;
+
+		request.cmd_code = cmd_type;
+
+		if (cmd_type == AUX_CMD_READ ||
+		    cmd_type == AUX_CMD_WRITE) {
+			/* Increment address for normal AUX transactions. */
+			request.address = address + (num_bytes - bytes_left);
+		}
+
+		/* Increment the pointer to the supplied data buffer. */
+		request.data = &data[num_bytes - bytes_left];
+
+		request.num_bytes = (bytes_left > 16) ? 16 : bytes_left;
+		bytes_left -= request.num_bytes;
+
+		if (cmd_type == AUX_CMD_I2C_READ && bytes_left) {
+			/*
+			 * Middle of a transaction I2C read request. Override
+			 * the command code that was set to cmd_type.
+			 */
+			request.cmd_code = AUX_CMD_I2C_READ_MOT;
+		} else if ((cmd_type == AUX_CMD_I2C_WRITE) && bytes_left) {
+			/*
+			 * Middle of a transaction I2C write request. Override
+			 * the command code that was set to cmd_type.
+			 */
+			request.cmd_code = AUX_CMD_I2C_WRITE_MOT;
+		}
+
+		status = aux_request(dev, &request);
+		if (status)
+			return status;
+	}
+
+	return 0;
+}
+
+/**
+ * aux_read() - Issue AUX read request
+ * @dev:           The LogiCore DP TX device in question
+ * @dpcd_address:  The DPCD address to read from
+ * @bytes_to_read: Number of bytes to read
+ * @read_data:     Buffer to receive the read data
+ *
+ * Issue a read request over the AUX channel that will read from the RX
+ * device's DisplayPort Configuration data (DPCD) address space. The read
+ * message will be divided into multiple transactions which read a maximum of
+ * 16 bytes each.
+ *
+ * Return: 0 if read operation was successful, -ve on error
+ */
+static int aux_read(struct udevice *dev, u32 dpcd_address, u32 bytes_to_read,
+		    void *read_data)
+{
+	int status;
+
+	if (!is_connected(dev))
+		return -ENODEV;
+
+	/* Send AUX read transaction. */
+	status = aux_common(dev, AUX_CMD_READ, dpcd_address,
+			    bytes_to_read, (u8 *)read_data);
+
+	return status;
+}
+
+/**
+ * aux_write() - Issue AUX write request
+ * @dev:            The LogiCore DP TX device in question
+ * @dpcd_address:   The DPCD address to write to
+ * @bytes_to_write: Number of bytes to write
+ * @write_data:     Buffer containig data to be written
+ *
+ * Issue a write request over the AUX channel that will write to
+ * the RX device's DisplayPort Configuration data (DPCD) address space. The
+ * write message will be divided into multiple transactions which write a
+ * maximum of 16 bytes each.
+ *
+ * Return: 0 if write operation was successful, -ve on error
+ */
+static int aux_write(struct udevice *dev, u32 dpcd_address, u32 bytes_to_write,
+		     void *write_data)
+{
+	int status;
+
+	if (!is_connected(dev))
+		return -ENODEV;
+
+	/* Send AUX write transaction. */
+	status = aux_common(dev, AUX_CMD_WRITE, dpcd_address,
+			    bytes_to_write, (u8 *)write_data);
+
+	return status;
+}
+
+/* Core initialization */
+
+/**
+ * initialize() - Initialize a LogiCore DP TX device
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Return: Always 0
+ */
+static int initialize(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u32 val;
+	u32 phy_config;
+	unsigned int k;
+
+	/* place the PHY (and GTTXRESET) into reset. */
+	phy_config = get_reg(dev, REG_PHY_CONFIG);
+	set_reg(dev, REG_PHY_CONFIG, phy_config | PHY_CONFIG_GT_ALL_RESET_MASK);
+
+	/* reset the video streams and AUX logic. */
+	set_reg(dev, REG_SOFT_RESET,
+		SOFT_RESET_VIDEO_STREAM_ALL_MASK |
+		SOFT_RESET_AUX_MASK);
+
+	/* disable the DisplayPort TX core. */
+	set_reg(dev, REG_ENABLE, 0);
+
+	/* set the clock divider. */
+	val = get_reg(dev, REG_AUX_CLK_DIVIDER);
+	val &= ~AUX_CLK_DIVIDER_VAL_MASK;
+	val |= dp_tx->s_axi_clk / 1000000;
+	set_reg(dev, REG_AUX_CLK_DIVIDER, val);
+
+	/* set the DisplayPort TX core's clock speed. */
+	set_reg(dev, REG_PHY_CLOCK_SELECT, PHY_CLOCK_SELECT_DEFAULT);
+
+	/* bring the PHY (and GTTXRESET) out of reset. */
+	set_reg(dev, REG_PHY_CONFIG,
+		phy_config & ~PHY_CONFIG_GT_ALL_RESET_MASK);
+
+	/* enable the DisplayPort TX core. */
+	set_reg(dev, REG_ENABLE, 1);
+
+	/* Unmask Hot-Plug-Detect (HPD) interrupts. */
+	set_reg(dev, REG_INTERRUPT_MASK,
+		~INTERRUPT_MASK_HPD_PULSE_DETECTED_MASK &
+		~INTERRUPT_MASK_HPD_EVENT_MASK &
+		~INTERRUPT_MASK_HPD_IRQ_MASK);
+
+	for (k = 0; k < 4; k++) {
+		/* Disable pre-cursor levels. */
+		set_reg(dev, REG_PHY_PRECURSOR_LANE_0 + 4 * k, 0);
+
+		/* Write default voltage swing levels to the TX registers. */
+		set_reg(dev, REG_PHY_VOLTAGE_DIFF_LANE_0 + 4 * k, 0);
+
+		/* Write default pre-emphasis levels to the TX registers. */
+		set_reg(dev, REG_PHY_POSTCURSOR_LANE_0 + 4 * k, 0);
+	}
+
+	return 0;
+}
+
+/**
+ * is_link_rate_valid() - Check if given link rate is valif for device
+ * @dev:       The LogiCore DP TX device in question
+ * @link_rate: The link rate to be checked for validity
+ *
+ * Return: true if he supplied link rate is valid, false otherwise
+ */
+static bool is_link_rate_valid(struct udevice *dev, u8 link_rate)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	bool valid = true;
+
+	if (link_rate != LINK_BW_SET_162GBPS &&
+	    link_rate != LINK_BW_SET_270GBPS &&
+	    link_rate != LINK_BW_SET_540GBPS)
+		valid = false;
+	else if (link_rate > dp_tx->link_config.max_link_rate)
+		valid = false;
+
+	return valid;
+}
+
+/**
+ * is_lane_count_valid() - Check if given lane count is valif for device
+ * @dev:        The LogiCore DP TX device in question
+ * @lane_count: The lane count to be checked for validity
+ *
+ * Return: true if he supplied lane count is valid, false otherwise
+ */
+static bool is_lane_count_valid(struct udevice *dev, u8 lane_count)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	bool valid = true;
+
+	if (lane_count != LANE_COUNT_SET_1 &&
+	    lane_count != LANE_COUNT_SET_2 &&
+	    lane_count != LANE_COUNT_SET_4)
+		valid = false;
+	else if (lane_count > dp_tx->link_config.max_lane_count)
+		valid = false;
+
+	return valid;
+}
+
+/**
+ * get_rx_capabilities() - Check if capabilities of RX device are valid for TX
+ *			   device
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Return: 0 if the capabilities of the RX device are valid for the TX device,
+ *	   -ve if not, of an error occurred during capability determination
+ */
+static int get_rx_capabilities(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u8 rx_max_link_rate;
+	u8 rx_max_lane_count;
+
+	if (!is_connected(dev))
+		return -ENODEV;
+
+	status = aux_read(dev, DPCD_RECEIVER_CAP_FIELD_START, 16,
+			  dp_tx->dpcd_rx_caps);
+	if (status)
+		return -EIO;
+
+	rx_max_link_rate = dp_tx->dpcd_rx_caps[DPCD_MAX_LINK_RATE];
+	rx_max_lane_count = dp_tx->dpcd_rx_caps[DPCD_MAX_LANE_COUNT] &
+			    DPCD_MAX_LANE_COUNT_MASK;
+
+	dp_tx->link_config.max_link_rate =
+		(rx_max_link_rate > dp_tx->max_link_rate) ?
+		dp_tx->max_link_rate : rx_max_link_rate;
+	if (!is_link_rate_valid(dev, rx_max_link_rate))
+		return -EINVAL;
+
+	dp_tx->link_config.max_lane_count =
+		(rx_max_lane_count > dp_tx->max_lane_count) ?
+		dp_tx->max_lane_count : rx_max_lane_count;
+	if (!is_lane_count_valid(dev, rx_max_lane_count))
+		return -EINVAL;
+
+	dp_tx->link_config.support_enhanced_framing_mode =
+		dp_tx->dpcd_rx_caps[DPCD_MAX_LANE_COUNT] &
+		DPCD_ENHANCED_FRAME_SUPPORT_MASK;
+
+	return 0;
+}
+
+/**
+ * enable_main_link() - Switch on main link for a device
+ * @dev: The LogiCore DP TX device in question
+ */
+static void enable_main_link(struct udevice *dev)
+{
+	/* reset the scrambler. */
+	set_reg(dev, REG_FORCE_SCRAMBLER_RESET, 0x1);
+
+	/* enable the main stream. */
+	set_reg(dev, REG_ENABLE_MAIN_STREAM, 0x1);
+}
+
+/**
+ * disable_main_link() - Switch off main link for a device
+ * @dev: The LogiCore DP TX device in question
+ */
+static void disable_main_link(struct udevice *dev)
+{
+	/* reset the scrambler. */
+	set_reg(dev, REG_FORCE_SCRAMBLER_RESET, 0x1);
+
+	/* Disable the main stream. */
+	set_reg(dev, REG_ENABLE_MAIN_STREAM, 0x0);
+}
+
+/**
+ * reset_dp_phy() - Reset a device
+ * @dev:   The LogiCore DP TX device in question
+ * @reset: Bit mask determining which bits in the device's config register
+ *	   should be set for the reset
+ */
+static void reset_dp_phy(struct udevice *dev, u32 reset)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u32 val;
+
+	set_reg(dev, REG_ENABLE, 0x0);
+
+	val = get_reg(dev, REG_PHY_CONFIG);
+
+	/* Apply reset. */
+	set_reg(dev, REG_PHY_CONFIG, val | reset);
+
+	/* Remove reset. */
+	set_reg(dev, REG_PHY_CONFIG, val);
+
+	/* Wait for the PHY to be ready. */
+	wait_phy_ready(dev, phy_status_lanes_ready_mask(dp_tx->max_lane_count));
+
+	set_reg(dev, REG_ENABLE, 0x1);
+}
+
+/**
+ * set_enhanced_frame_mode() - Enable/Disable enhanced frame mode
+ * @dev:    The LogiCore DP TX device in question
+ * @enable: Flag to determine whether to enable (1) or disable (0) the enhanced
+ *	    frame mode
+ *
+ * Enable or disable the enhanced framing symbol sequence for
+ * both the DisplayPort TX core and the RX device.
+ *
+ * Return: 0 if enabling/disabling the enhanced frame mode was successful, -ve
+ *	   on error
+ */
+static int set_enhanced_frame_mode(struct udevice *dev, u8 enable)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u8 val;
+
+	if (!is_connected(dev))
+		return -ENODEV;
+
+	if (dp_tx->link_config.support_enhanced_framing_mode)
+		dp_tx->link_config.enhanced_framing_mode = enable;
+	else
+		dp_tx->link_config.enhanced_framing_mode = false;
+
+	/* Write enhanced frame mode enable to the DisplayPort TX core. */
+	set_reg(dev, REG_ENHANCED_FRAME_EN,
+		dp_tx->link_config.enhanced_framing_mode);
+
+	/* Write enhanced frame mode enable to the RX device. */
+	status = aux_read(dev, DPCD_LANE_COUNT_SET, 0x1, &val);
+	if (status)
+		return -EIO;
+
+	if (dp_tx->link_config.enhanced_framing_mode)
+		val |= DPCD_ENHANCED_FRAME_EN_MASK;
+	else
+		val &= ~DPCD_ENHANCED_FRAME_EN_MASK;
+
+	status = aux_write(dev, DPCD_LANE_COUNT_SET, 0x1, &val);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * set_lane_count() - Set the lane count
+ * @dev:        The LogiCore DP TX device in question
+ * @lane_count: Lane count to set
+ *
+ * Set the number of lanes to be used by the main link for both
+ * the DisplayPort TX core and the RX device.
+ *
+ * Return: 0 if setting the lane count was successful, -ve on error
+ */
+static int set_lane_count(struct udevice *dev, u8 lane_count)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u8 val;
+
+	if (!is_connected(dev))
+		return -ENODEV;
+
+	printf("       set lane count to %u\n", lane_count);
+
+	dp_tx->link_config.lane_count = lane_count;
+
+	/* Write the new lane count to the DisplayPort TX core. */
+	set_reg(dev, REG_LANE_COUNT_SET, dp_tx->link_config.lane_count);
+
+	/* Write the new lane count to the RX device. */
+	status = aux_read(dev, DPCD_LANE_COUNT_SET, 0x1, &val);
+	if (status)
+		return -EIO;
+	val &= ~DPCD_LANE_COUNT_SET_MASK;
+	val |= dp_tx->link_config.lane_count;
+
+	status = aux_write(dev, DPCD_LANE_COUNT_SET, 0x1, &val);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * set_clk_speed() - Set DP phy clock speed
+ * @dev:   The LogiCore DP TX device in question
+ * @speed: The clock frquency to set (one of PHY_CLOCK_SELECT_*)
+ *
+ * Set the clock frequency for the DisplayPort PHY corresponding to a desired
+ * data rate.
+ *
+ * Return: 0 if setting the DP phy clock speed was successful, -ve on error
+ */
+static int set_clk_speed(struct udevice *dev, u32 speed)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u32 val;
+	u32 mask;
+
+	/* Disable the DisplayPort TX core first. */
+	val = get_reg(dev, REG_ENABLE);
+	set_reg(dev, REG_ENABLE, 0x0);
+
+	/* Change speed of the feedback clock. */
+	set_reg(dev, REG_PHY_CLOCK_SELECT, speed);
+
+	/* Re-enable the DisplayPort TX core if it was previously enabled. */
+	if (val)
+		set_reg(dev, REG_ENABLE, 0x1);
+
+	/* Wait until the PHY is ready. */
+	mask = phy_status_lanes_ready_mask(dp_tx->max_lane_count);
+	status = wait_phy_ready(dev, mask);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * set_link_rate() - Set the link rate
+ * @dev:       The LogiCore DP TX device in question
+ * @link_rate: The link rate to set (one of LINK_BW_SET_*)
+ *
+ * Set the data rate to be used by the main link for both the DisplayPort TX
+ * core and the RX device.
+ *
+ * Return: 0 if setting the link rate was successful, -ve on error
+ */
+static int set_link_rate(struct udevice *dev, u8 link_rate)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+
+	/* Write a corresponding clock frequency to the DisplayPort TX core. */
+	switch (link_rate) {
+	case LINK_BW_SET_162GBPS:
+		printf("       set link rate to 1.62 Gb/s\n");
+		status = set_clk_speed(dev, PHY_CLOCK_SELECT_162GBPS);
+		break;
+	case LINK_BW_SET_270GBPS:
+		printf("       set link rate to 2.70 Gb/s\n");
+		status = set_clk_speed(dev, PHY_CLOCK_SELECT_270GBPS);
+		break;
+	case LINK_BW_SET_540GBPS:
+		printf("       set link rate to 5.40 Gb/s\n");
+		status = set_clk_speed(dev, PHY_CLOCK_SELECT_540GBPS);
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (status)
+		return -EIO;
+
+	dp_tx->link_config.link_rate = link_rate;
+
+	/* Write new link rate to the DisplayPort TX core. */
+	set_reg(dev, REG_LINK_BW_SET, dp_tx->link_config.link_rate);
+
+	/* Write new link rate to the RX device. */
+	status = aux_write(dev, DPCD_LINK_BW_SET, 1,
+			   &dp_tx->link_config.link_rate);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/* Link training */
+
+/**
+ * get_training_delay() - Get training delay
+ * @dev:            The LogiCore DP TX device in question
+ * @training_state: The training state for which the required training delay
+ *		    should be queried
+ *
+ * Determine what the RX device's required training delay is for
+ * link training.
+ *
+ * Return: The training delay in us
+ */
+static int get_training_delay(struct udevice *dev, int training_state)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u16 delay;
+
+	switch (dp_tx->dpcd_rx_caps[DPCD_TRAIN_AUX_RD_INTERVAL]) {
+	case DPCD_TRAIN_AUX_RD_INT_100_400US:
+		if (training_state == TS_CLOCK_RECOVERY)
+			/* delay for the clock recovery phase. */
+			delay = 100;
+		else
+			/* delay for the channel equalization phase. */
+			delay = 400;
+		break;
+	case DPCD_TRAIN_AUX_RD_INT_4MS:
+		delay = 4000;
+		break;
+	case DPCD_TRAIN_AUX_RD_INT_8MS:
+		delay = 8000;
+		break;
+	case DPCD_TRAIN_AUX_RD_INT_12MS:
+		delay = 12000;
+		break;
+	case DPCD_TRAIN_AUX_RD_INT_16MS:
+		delay = 16000;
+		break;
+	default:
+		/* Default to 20 ms. */
+		delay = 20000;
+		break;
+	}
+
+	return delay;
+}
+
+/**
+ * set_vswing_preemp() - Build AUX data to set voltage swing and pre-emphasis
+ * @dev:      The LogiCore DP TX device in question
+ * @aux_data: Buffer to receive the built AUX data
+ *
+ * Build AUX data to set current voltage swing and pre-emphasis level settings;
+ * the necessary data is taken from the link_config structure.
+ */
+static void set_vswing_preemp(struct udevice *dev, u8 *aux_data)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u8 data;
+	u8 vs_level_rx = dp_tx->link_config.vs_level;
+	u8 pe_level_rx = dp_tx->link_config.pe_level;
+
+	/* Set up the data buffer for writing to the RX device. */
+	data = (pe_level_rx << DPCD_TRAINING_LANEX_SET_PE_SHIFT) | vs_level_rx;
+	/* The maximum voltage swing has been reached. */
+	if (vs_level_rx == MAXIMUM_VS_LEVEL)
+		data |= DPCD_TRAINING_LANEX_SET_MAX_VS_MASK;
+
+	/* The maximum pre-emphasis level has been reached. */
+	if (pe_level_rx == MAXIMUM_PE_LEVEL)
+		data |= DPCD_TRAINING_LANEX_SET_MAX_PE_MASK;
+	memset(aux_data, data, 4);
+}
+
+/**
+ * adj_vswing_preemp() - Adjust voltage swing and pre-emphasis
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Set new voltage swing and pre-emphasis levels using the
+ * adjustment requests obtained from the RX device.
+ *
+ * Return: 0 if voltage swing and pre-emphasis could be adjusted successfully,
+ *	   -ve on error
+ */
+static int adj_vswing_preemp(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u8 index;
+	u8 vs_level_adj_req[4];
+	u8 pe_level_adj_req[4];
+	u8 aux_data[4];
+	u8 *ajd_reqs = &dp_tx->lane_status_ajd_reqs[4];
+
+	/*
+	 * Analyze the adjustment requests for changes in voltage swing and
+	 * pre-emphasis levels.
+	 */
+	vs_level_adj_req[0] = ajd_reqs[0] & DPCD_ADJ_REQ_LANE_0_2_VS_MASK;
+	vs_level_adj_req[1] = (ajd_reqs[0] & DPCD_ADJ_REQ_LANE_1_3_VS_MASK) >>
+			      DPCD_ADJ_REQ_LANE_1_3_VS_SHIFT;
+	vs_level_adj_req[2] = ajd_reqs[1] & DPCD_ADJ_REQ_LANE_0_2_VS_MASK;
+	vs_level_adj_req[3] = (ajd_reqs[1] & DPCD_ADJ_REQ_LANE_1_3_VS_MASK) >>
+			      DPCD_ADJ_REQ_LANE_1_3_VS_SHIFT;
+	pe_level_adj_req[0] = (ajd_reqs[0] & DPCD_ADJ_REQ_LANE_0_2_PE_MASK) >>
+			      DPCD_ADJ_REQ_LANE_0_2_PE_SHIFT;
+	pe_level_adj_req[1] = (ajd_reqs[0] & DPCD_ADJ_REQ_LANE_1_3_PE_MASK) >>
+			      DPCD_ADJ_REQ_LANE_1_3_PE_SHIFT;
+	pe_level_adj_req[2] = (ajd_reqs[1] & DPCD_ADJ_REQ_LANE_0_2_PE_MASK) >>
+			      DPCD_ADJ_REQ_LANE_0_2_PE_SHIFT;
+	pe_level_adj_req[3] = (ajd_reqs[1] & DPCD_ADJ_REQ_LANE_1_3_PE_MASK) >>
+			      DPCD_ADJ_REQ_LANE_1_3_PE_SHIFT;
+
+	/*
+	 * Change the drive settings to match the adjustment requests. Use the
+	 * greatest level requested.
+	 */
+	dp_tx->link_config.vs_level = 0;
+	dp_tx->link_config.pe_level = 0;
+	for (index = 0; index < dp_tx->link_config.lane_count; index++) {
+		if (vs_level_adj_req[index] > dp_tx->link_config.vs_level)
+			dp_tx->link_config.vs_level = vs_level_adj_req[index];
+		if (pe_level_adj_req[index] > dp_tx->link_config.pe_level)
+			dp_tx->link_config.pe_level = pe_level_adj_req[index];
+	}
+
+	/*
+	 * Verify that the voltage swing and pre-emphasis combination is
+	 * allowed. Some combinations will result in a differential peak-to-peak
+	 * voltage that is outside the permissible range. See the VESA
+	 * DisplayPort v1.2 Specification, section 3.1.5.2.
+	 * The valid combinations are:
+	 *      PE=0    PE=1    PE=2    PE=3
+	 * VS=0 valid   valid   valid   valid
+	 * VS=1 valid   valid   valid
+	 * VS=2 valid   valid
+	 * VS=3 valid
+	 *
+	 * NOTE:
+	 * Xilinix dp_v3_1 driver seems to have an off by one error when
+	 * limiting pe_level which is fixed here.
+	 */
+	if (dp_tx->link_config.pe_level > (3 - dp_tx->link_config.vs_level))
+		dp_tx->link_config.pe_level = 3 - dp_tx->link_config.vs_level;
+
+	/*
+	 * Make the adjustments to both the DisplayPort TX core and the RX
+	 * device.
+	 */
+	set_vswing_preemp(dev, aux_data);
+	/*
+	 * Write the voltage swing and pre-emphasis levels for each lane to the
+	 * RX device.
+	 */
+	status = aux_write(dev, DPCD_TRAINING_LANE0_SET, 4, aux_data);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * get_lane_status_adj_reqs() - Read lane status and adjustment requests
+ *				information from the device
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Do a burst AUX read from the RX device over the AUX channel. The contents of
+ * the status registers will be stored for later use by check_clock_recovery,
+ * check_channel_equalization, and adj_vswing_preemp.
+ *
+ * Return: 0 if the status information were read successfully, -ve on error
+ */
+static int get_lane_status_adj_reqs(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+
+	/*
+	 * Read and store 4 bytes of lane status and 2 bytes of adjustment
+	 * requests.
+	 */
+	status = aux_read(dev, DPCD_STATUS_LANE_0_1, 6,
+			  dp_tx->lane_status_ajd_reqs);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * check_clock_recovery() - Check clock recovery success
+ * @dev:        The LogiCore DP TX device in question
+ * @lane_count: The number of lanes for which to check clock recovery success
+ *
+ * Check if the RX device's DisplayPort Configuration data (DPCD) indicates
+ * that the clock recovery sequence during link training was successful - the
+ * RX device's link clock and data recovery unit has realized and maintained
+ * the frequency lock for all lanes currently in use.
+ *
+ * Return: 0 if clock recovery was successful on all lanes in question, -ve if
+ *	   not
+ */
+static int check_clock_recovery(struct udevice *dev, u8 lane_count)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u8 *lane_status = dp_tx->lane_status_ajd_reqs;
+
+	/* Check that all LANEx_CR_DONE bits are set. */
+	switch (lane_count) {
+	case LANE_COUNT_SET_4:
+		if (!(lane_status[1] & DPCD_STATUS_LANE_3_CR_DONE_MASK))
+			goto out_fail;
+		if (!(lane_status[1] & DPCD_STATUS_LANE_2_CR_DONE_MASK))
+			goto out_fail;
+	/* Drop through and check lane 1. */
+	case LANE_COUNT_SET_2:
+		if (!(lane_status[0] & DPCD_STATUS_LANE_1_CR_DONE_MASK))
+			goto out_fail;
+	/* Drop through and check lane 0. */
+	case LANE_COUNT_SET_1:
+		if (!(lane_status[0] & DPCD_STATUS_LANE_0_CR_DONE_MASK))
+			goto out_fail;
+	default:
+		/* All (lane_count) lanes have achieved clock recovery. */
+		break;
+	}
+
+	return 0;
+
+out_fail:
+	return -EIO;
+}
+
+/**
+ * check_channel_equalization() - Check channel equalization success
+ * @dev:        The LogiCore DP TX device in question
+ * @lane_count: The number of lanes for which to check channel equalization
+ *		success
+ *
+ * Check if the RX device's DisplayPort Configuration data (DPCD) indicates
+ * that the channel equalization sequence during link training was successful -
+ * the RX device has achieved channel equalization, symbol lock, and interlane
+ * alignment for all lanes currently in use.
+ *
+ * Return: 0 if channel equalization was successful on all lanes in question,
+ *	   -ve if not
+ */
+static int check_channel_equalization(struct udevice *dev, u8 lane_count)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u8 *lane_status = dp_tx->lane_status_ajd_reqs;
+
+	/* Check that all LANEx_CHANNEL_EQ_DONE bits are set. */
+	switch (lane_count) {
+	case LANE_COUNT_SET_4:
+		if (!(lane_status[1] & DPCD_STATUS_LANE_3_CE_DONE_MASK))
+			goto out_fail;
+		if (!(lane_status[1] & DPCD_STATUS_LANE_2_CE_DONE_MASK))
+			goto out_fail;
+	/* Drop through and check lane 1. */
+	case LANE_COUNT_SET_2:
+		if (!(lane_status[0] & DPCD_STATUS_LANE_1_CE_DONE_MASK))
+			goto out_fail;
+	/* Drop through and check lane 0. */
+	case LANE_COUNT_SET_1:
+		if (!(lane_status[0] & DPCD_STATUS_LANE_0_CE_DONE_MASK))
+			goto out_fail;
+	default:
+		/* All (lane_count) lanes have achieved channel equalization. */
+		break;
+	}
+
+	/* Check that all LANEx_SYMBOL_LOCKED bits are set. */
+	switch (lane_count) {
+	case LANE_COUNT_SET_4:
+		if (!(lane_status[1] & DPCD_STATUS_LANE_3_SL_DONE_MASK))
+			goto out_fail;
+		if (!(lane_status[1] & DPCD_STATUS_LANE_2_SL_DONE_MASK))
+			goto out_fail;
+	/* Drop through and check lane 1. */
+	case LANE_COUNT_SET_2:
+		if (!(lane_status[0] & DPCD_STATUS_LANE_1_SL_DONE_MASK))
+			goto out_fail;
+	/* Drop through and check lane 0. */
+	case LANE_COUNT_SET_1:
+		if (!(lane_status[0] & DPCD_STATUS_LANE_0_SL_DONE_MASK))
+			goto out_fail;
+	default:
+		/* All (lane_count) lanes have achieved symbol lock. */
+		break;
+	}
+
+	/* Check that interlane alignment is done. */
+	if (!(lane_status[2] & DPCD_LANE_ALIGN_STATUS_UPDATED_IA_DONE_MASK))
+		goto out_fail;
+
+	return 0;
+
+out_fail:
+	return -EIO;
+}
+
+/**
+ * set_training_pattern() - Set training pattern for link training
+ * @dev:     The LogiCore DP TX device in question
+ * @pattern: The training pattern to set
+ *
+ * Set the training pattern to be used during link training for both the
+ * DisplayPort TX core and the RX device.
+ *
+ * Return: 0 if the training pattern could be set successfully, -ve if not
+ */
+static int set_training_pattern(struct udevice *dev, u32 pattern)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u8 aux_data[5];
+
+	/* Write to the DisplayPort TX core. */
+	set_reg(dev, REG_TRAINING_PATTERN_SET, pattern);
+
+	aux_data[0] = pattern;
+
+	/* Write scrambler disable to the DisplayPort TX core. */
+	switch (pattern) {
+	case TRAINING_PATTERN_SET_OFF:
+		set_reg(dev, REG_SCRAMBLING_DISABLE, 0);
+		dp_tx->link_config.scrambler_en = 1;
+		break;
+	case TRAINING_PATTERN_SET_TP1:
+	case TRAINING_PATTERN_SET_TP2:
+	case TRAINING_PATTERN_SET_TP3:
+		aux_data[0] |= DPCD_TP_SET_SCRAMB_DIS_MASK;
+		set_reg(dev, REG_SCRAMBLING_DISABLE, 1);
+		dp_tx->link_config.scrambler_en = 0;
+		break;
+	default:
+		break;
+	}
+
+	/*
+	 * Make the adjustments to both the DisplayPort TX core and the RX
+	 * device.
+	 */
+	set_vswing_preemp(dev, &aux_data[1]);
+	/*
+	 * Write the voltage swing and pre-emphasis levels for each lane to the
+	 * RX device.
+	 */
+	if  (pattern == TRAINING_PATTERN_SET_OFF)
+		status = aux_write(dev, DPCD_TP_SET, 1, aux_data);
+	else
+		status = aux_write(dev, DPCD_TP_SET, 5, aux_data);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * training_state_clock_recovery() - Run clock recovery part of link training
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Run the clock recovery sequence as part of link training. The
+ * sequence is as follows:
+ *
+ *	0) Start signaling at the minimum voltage swing, pre-emphasis, and
+ *	   post- cursor levels.
+ *	1) Transmit training pattern 1 over the main link with symbol
+ *	   scrambling disabled.
+ *	2) The clock recovery loop. If clock recovery is unsuccessful after
+ *	   MaxIterations loop iterations, return.
+ *	2a) Wait for at least the period of time specified in the RX device's
+ *	    DisplayPort Configuration data (DPCD) register,
+ *	    TRAINING_AUX_RD_INTERVAL.
+ *	2b) Check if all lanes have achieved clock recovery lock. If so,
+ *	    return.
+ *	2c) Check if the same voltage swing level has been used 5 consecutive
+ *	    times or if the maximum level has been reached. If so, return.
+ *	2d) Adjust the voltage swing, pre-emphasis, and post-cursor levels as
+ *	    requested by the RX device.
+ *	2e) Loop back to 2a.
+ *
+ * For a more detailed description of the clock recovery sequence, see section
+ * 3.5.1.2.1 of the DisplayPort 1.2a specification document.
+ *
+ * Return: The next state machine state to advance to
+ */
+static unsigned int training_state_clock_recovery(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u32 delay_us;
+	u8 prev_vs_level = 0;
+	u8 same_vs_level_count = 0;
+
+	/*
+	 * Obtain the required delay for clock recovery as specified by the
+	 * RX device.
+	 */
+	delay_us = get_training_delay(dev, TS_CLOCK_RECOVERY);
+
+	/* Start CRLock. */
+
+	/* Transmit training pattern 1. */
+	/* Disable the scrambler. */
+	/* Start from minimal voltage swing and pre-emphasis levels. */
+	dp_tx->link_config.vs_level = 0;
+	dp_tx->link_config.pe_level = 0;
+	status = set_training_pattern(dev, TRAINING_PATTERN_SET_TP1);
+	if (status)
+		return TS_FAILURE;
+
+	while (1) {
+		/* Wait delay specified in TRAINING_AUX_RD_INTERVAL. */
+		udelay(delay_us);
+
+		/* Get lane and adjustment requests. */
+		status = get_lane_status_adj_reqs(dev);
+		if (status)
+			return TS_FAILURE;
+
+		/*
+		 * Check if all lanes have realized and maintained the frequency
+		 * lock and get adjustment requests.
+		 */
+		status = check_clock_recovery(dev,
+					      dp_tx->link_config.lane_count);
+		if (!status)
+			return TS_CHANNEL_EQUALIZATION;
+
+		/*
+		 * Check if the same voltage swing for each lane has been used 5
+		 * consecutive times.
+		 */
+		if (prev_vs_level == dp_tx->link_config.vs_level) {
+			same_vs_level_count++;
+		} else {
+			same_vs_level_count = 0;
+			prev_vs_level = dp_tx->link_config.vs_level;
+		}
+		if (same_vs_level_count >= 5)
+			break;
+
+		/* Only try maximum voltage swing once. */
+		if (dp_tx->link_config.vs_level == MAXIMUM_VS_LEVEL)
+			break;
+
+		/* Adjust the drive settings as requested by the RX device. */
+		status = adj_vswing_preemp(dev);
+		if (status)
+			/* The AUX write failed. */
+			return TS_FAILURE;
+	}
+
+	return TS_ADJUST_LINK_RATE;
+}
+
+/**
+ * training_state_channel_equalization() - Run channel equalization part of
+ *					   link training
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Run the channel equalization sequence as part of link
+ * training. The sequence is as follows:
+ *
+ *	0) Start signaling with the same drive settings used at the end of the
+ *	   clock recovery sequence.
+ *	1) Transmit training pattern 2 (or 3) over the main link with symbol
+ *	   scrambling disabled.
+ *	2) The channel equalization loop. If channel equalization is
+ *	   unsuccessful after 5 loop iterations, return.
+ *	2a) Wait for at least the period of time specified in the RX device's
+ *	    DisplayPort Configuration data (DPCD) register,
+ *	    TRAINING_AUX_RD_INTERVAL.
+ *	2b) Check if all lanes have achieved channel equalization, symbol lock,
+ *	    and interlane alignment. If so, return.
+ *	2c) Check if the same voltage swing level has been used 5 consecutive
+ *	    times or if the maximum level has been reached. If so, return.
+ *	2d) Adjust the voltage swing, pre-emphasis, and post-cursor levels as
+ *	    requested by the RX device.
+ *	2e) Loop back to 2a.
+ *
+ * For a more detailed description of the channel equalization sequence, see
+ * section 3.5.1.2.2 of the DisplayPort 1.2a specification document.
+ *
+ * Return: The next state machine state to advance to
+ */
+static int training_state_channel_equalization(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	u32 delay_us;
+	u32 iteration_count = 0;
+
+	/*
+	 * Obtain the required delay for channel equalization as specified by
+	 * the RX device.
+	 */
+	delay_us = get_training_delay(dev, TS_CHANNEL_EQUALIZATION);
+
+	/* Start channel equalization. */
+
+	/* Write the current drive settings. */
+	/* Transmit training pattern 2/3. */
+	if (dp_tx->dpcd_rx_caps[DPCD_MAX_LANE_COUNT] & DPCD_TPS3_SUPPORT_MASK)
+		status = set_training_pattern(dev, TRAINING_PATTERN_SET_TP3);
+	else
+		status = set_training_pattern(dev, TRAINING_PATTERN_SET_TP2);
+
+	if (status)
+		return TS_FAILURE;
+
+	while (iteration_count < 5) {
+		/* Wait delay specified in TRAINING_AUX_RD_INTERVAL. */
+		udelay(delay_us);
+
+		/* Get lane and adjustment requests. */
+		status = get_lane_status_adj_reqs(dev);
+		if (status)
+			/* The AUX read failed. */
+			return TS_FAILURE;
+
+		/* Check that all lanes still have their clocks locked. */
+		status = check_clock_recovery(dev,
+					      dp_tx->link_config.lane_count);
+		if (status)
+			break;
+
+		/*
+		 * Check if all lanes have accomplished channel equalization,
+		 * symbol lock, and interlane alignment.
+		 */
+		status =
+		    check_channel_equalization(dev,
+					       dp_tx->link_config.lane_count);
+		if (!status)
+			return TS_SUCCESS;
+
+		/* Adjust the drive settings as requested by the RX device. */
+		status = adj_vswing_preemp(dev);
+		if (status)
+			/* The AUX write failed. */
+			return TS_FAILURE;
+
+		iteration_count++;
+	}
+
+	/*
+	 * Tried 5 times with no success. Try a reduced bitrate first, then
+	 * reduce the number of lanes.
+	 */
+	return TS_ADJUST_LINK_RATE;
+}
+
+/**
+ * training_state_adjust_link_rate() - Downshift data rate and/or lane count
+ * @dev: The LogiCore DP TX device in question
+ *
+ * This function is reached if either the clock recovery or the channel
+ * equalization process failed during training. As a result, the data rate will
+ * be downshifted, and training will be re-attempted (starting with clock
+ * recovery) at the reduced data rate. If the data rate is already at 1.62
+ * Gbps, a downshift in lane count will be attempted.
+ *
+ * Return: The next state machine state to advance to
+ */
+static int training_state_adjust_link_rate(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+
+	switch (dp_tx->link_config.link_rate) {
+	case LINK_BW_SET_540GBPS:
+		status = set_link_rate(dev, LINK_BW_SET_270GBPS);
+		if (status) {
+			status = TS_FAILURE;
+			break;
+		}
+		status = TS_CLOCK_RECOVERY;
+		break;
+	case LINK_BW_SET_270GBPS:
+		status = set_link_rate(dev, LINK_BW_SET_162GBPS);
+		if (status) {
+			status = TS_FAILURE;
+			break;
+		}
+		status = TS_CLOCK_RECOVERY;
+		break;
+	default:
+		/*
+		 * Already at the lowest link rate. Try reducing the lane
+		 * count next.
+		 */
+		status = TS_ADJUST_LANE_COUNT;
+		break;
+	}
+
+	return status;
+}
+
+/**
+ * trainig_state_adjust_lane_count - Downshift lane count
+ * @dev: The LogiCore DP TX device in question
+ *
+ * This function is reached if either the clock recovery or the channel
+ * equalization process failed during training, and a minimal data rate of 1.62
+ * Gbps was being used. As a result, the number of lanes in use will be
+ * reduced, and training will be re-attempted (starting with clock recovery) at
+ * this lower lane count.
+ *
+ * Return: The next state machine state to advance to
+ */
+static int trainig_state_adjust_lane_count(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+
+	switch (dp_tx->link_config.lane_count) {
+	case LANE_COUNT_SET_4:
+		status = set_lane_count(dev, LANE_COUNT_SET_2);
+		if (status) {
+			status = TS_FAILURE;
+			break;
+		}
+
+		status = set_link_rate(dev, dp_tx->link_config.max_link_rate);
+		if (status) {
+			status = TS_FAILURE;
+			break;
+		}
+		status = TS_CLOCK_RECOVERY;
+		break;
+	case LANE_COUNT_SET_2:
+		status = set_lane_count(dev, LANE_COUNT_SET_1);
+		if (status) {
+			status = TS_FAILURE;
+			break;
+		}
+
+		status = set_link_rate(dev, dp_tx->link_config.max_link_rate);
+		if (status) {
+			status = TS_FAILURE;
+			break;
+		}
+		status = TS_CLOCK_RECOVERY;
+		break;
+	default:
+		/*
+		 * Already at the lowest lane count. Training has failed at the
+		 * lowest lane count and link rate.
+		 */
+		status = TS_FAILURE;
+		break;
+	}
+
+	return status;
+}
+
+/**
+ * check_link_status() - Check status of link
+ * @dev:        The LogiCore DP TX device in question
+ * @lane_count: The lane count to use for the check
+ *
+ * Check if the receiver's DisplayPort Configuration data (DPCD) indicates the
+ * receiver has achieved and maintained clock recovery, channel equalization,
+ * symbol lock, and interlane alignment for all lanes currently in use.
+ *
+ * Return: 0 if the link status is OK, -ve if a error occurred during checking
+ */
+static int check_link_status(struct udevice *dev, u8 lane_count)
+{
+	u8 retry_count = 0;
+
+	if (!is_connected(dev))
+		return -ENODEV;
+
+	/* Retrieve AUX info. */
+	do {
+		int status;
+
+		/* Get lane and adjustment requests. */
+		status = get_lane_status_adj_reqs(dev);
+		if (status)
+			return -EIO;
+
+		/* Check if the link needs training. */
+		if ((check_clock_recovery(dev, lane_count) == 0) &&
+		    (check_channel_equalization(dev, lane_count) == 0))
+			return 0;
+
+		retry_count++;
+	} while (retry_count < 5); /* Retry up to 5 times. */
+
+	return -EIO;
+}
+
+/**
+ * run_training() - Run link training
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Run the link training process. It is implemented as a state machine, with
+ * each state returning the next state. First, the clock recovery sequence will
+ * be run; if successful, the channel equalization sequence will run. If either
+ * the clock recovery or channel equalization sequence failed, the link rate or
+ * the number of lanes used will be reduced and training will be re-attempted.
+ * If training fails at the minimal data rate, 1.62 Gbps with a single lane,
+ * training will no longer re-attempt and fail.
+ *
+ * ### Here be dragons ###
+ * There are undocumented timeout constraints in the link training process. In
+ * DP v1.2a spec, Chapter 3.5.1.2.2 a 10ms limit for the complete training
+ * process is mentioned. Which individual timeouts are derived and implemented
+ * by sink manufacturers is unknown. So each step should be as short as
+ * possible and link training should start as soon as possible after HPD.
+ *
+ * Return: 0 if the training sequence ran successfully, -ve if a error occurred
+ *	   or the training failed
+ */
+static int run_training(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	int training_state = TS_CLOCK_RECOVERY;
+
+	while (1) {
+		switch (training_state) {
+		case TS_CLOCK_RECOVERY:
+			training_state =
+				training_state_clock_recovery(dev);
+			break;
+		case TS_CHANNEL_EQUALIZATION:
+			training_state =
+				training_state_channel_equalization(dev);
+			break;
+		case TS_ADJUST_LINK_RATE:
+			training_state =
+				training_state_adjust_link_rate(dev);
+			break;
+		case TS_ADJUST_LANE_COUNT:
+			training_state =
+				trainig_state_adjust_lane_count(dev);
+			break;
+		default:
+			break;
+		}
+
+		if (training_state == TS_SUCCESS)
+			break;
+		else if (training_state == TS_FAILURE)
+			return -EIO;
+
+		if (training_state == TS_ADJUST_LINK_RATE ||
+		    training_state == TS_ADJUST_LANE_COUNT) {
+			if (!dp_tx->train_adaptive)
+				return -EIO;
+
+			status = set_training_pattern(dev,
+						      TRAINING_PATTERN_SET_OFF);
+			if (status)
+				return -EIO;
+		}
+	}
+
+	/* Final status check. */
+	status = check_link_status(dev, dp_tx->link_config.lane_count);
+	if (status)
+		return -EIO;
+
+	return 0;
+}
+
+/* Link policy maker */
+
+/**
+ * cfg_main_link_max() - Determine best common capabilities
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Determine the common capabilities between the DisplayPort TX core and the RX
+ * device.
+ *
+ * Return: 0 if the determination succeeded, -ve on error
+ */
+static int cfg_main_link_max(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+
+	if (!is_connected(dev))
+		return -ENODEV;
+
+	/*
+	 * Configure the main link to the maximum common link rate between the
+	 * DisplayPort TX core and the RX device.
+	 */
+	status = set_link_rate(dev, dp_tx->link_config.max_link_rate);
+	if (status)
+		return status;
+
+	/*
+	 * Configure the main link to the maximum common lane count between the
+	 * DisplayPort TX core and the RX device.
+	 */
+	status = set_lane_count(dev, dp_tx->link_config.max_lane_count);
+	if (status)
+		return status;
+
+	return 0;
+}
+
+/**
+ * establish_link() - Establish a link
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Check if the link needs training and run the training sequence if training
+ * is required.
+ *
+ * Return: 0 if the link was established successfully, -ve on error
+ */
+static int establish_link(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int status;
+	int status2;
+	u32 mask;
+
+	reset_dp_phy(dev, PHY_CONFIG_PHY_RESET_MASK);
+
+	/* Disable main link during training. */
+	disable_main_link(dev);
+
+	/* Wait for the PHY to be ready. */
+	mask = phy_status_lanes_ready_mask(dp_tx->max_lane_count);
+	status = wait_phy_ready(dev, mask);
+	if (status)
+		return -EIO;
+
+	/* Train main link. */
+	status = run_training(dev);
+
+	/* Turn off the training pattern and enable scrambler. */
+	status2 = set_training_pattern(dev, TRAINING_PATTERN_SET_OFF);
+	if (status || status2)
+		return -EIO;
+
+	return 0;
+}
+
+/*
+ * Stream policy maker
+ */
+
+/**
+ * cfg_msa_recalculate() - Calculate MSA parameters
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Calculate the following Main Stream Attributes (MSA):
+ * - Transfer unit size
+ * - User pixel width
+ * - Horizontal total clock
+ * - Vertical total clock
+ * - misc_0
+ * - misc_1
+ * - Data per lane
+ * - Average number of bytes per transfer unit
+ * - Number of initial wait cycles
+ *
+ * These values are derived from:
+ * - Bits per color
+ * - Horizontal resolution
+ * - Vertical resolution
+ * - Horizontal blank start
+ * - Vertical blank start
+ * - Pixel clock (in KHz)
+ * - Horizontal sync polarity
+ * - Vertical sync polarity
+ * - Horizontal sync pulse width
+ * - Vertical sync pulse width
+ */
+static void cfg_msa_recalculate(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u32 video_bw;
+	u32 link_bw;
+	u32 words_per_line;
+	u8 bits_per_pixel;
+	struct main_stream_attributes *msa_config;
+	struct link_config *link_config;
+
+	msa_config = &dp_tx->main_stream_attributes;
+	link_config = &dp_tx->link_config;
+
+	/*
+	 * Set the user pixel width to handle clocks that exceed the
+	 * capabilities of the DisplayPort TX core.
+	 */
+	if (msa_config->override_user_pixel_width == 0) {
+		if (msa_config->pixel_clock_hz > 300000000 &&
+		    link_config->lane_count == LANE_COUNT_SET_4) {
+			msa_config->user_pixel_width = 4;
+		} /*
+		   * Xilinx driver used 75 MHz as a limit here, 150 MHZ should
+		   * be more sane
+		   */
+		else if ((msa_config->pixel_clock_hz > 150000000) &&
+			 (link_config->lane_count != LANE_COUNT_SET_1)) {
+			msa_config->user_pixel_width = 2;
+		} else {
+			msa_config->user_pixel_width = 1;
+		}
+	}
+
+	/* Compute the rest of the MSA values. */
+	msa_config->n_vid = 27 * 1000 * link_config->link_rate;
+
+	/* Miscellaneous attributes. */
+	if (msa_config->bits_per_color == 6)
+		msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_6BPC;
+	else if (msa_config->bits_per_color == 8)
+		msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_8BPC;
+	else if (msa_config->bits_per_color == 10)
+		msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_10BPC;
+	else if (msa_config->bits_per_color == 12)
+		msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_12BPC;
+	else if (msa_config->bits_per_color == 16)
+		msa_config->misc_0 = MAIN_STREAMX_MISC0_BDC_16BPC;
+
+	msa_config->misc_0 = (msa_config->misc_0 <<
+			      MAIN_STREAMX_MISC0_BDC_SHIFT) |
+			     (msa_config->y_cb_cr_colorimetry <<
+			      MAIN_STREAMX_MISC0_YCBCR_COLORIMETRY_SHIFT) |
+			     (msa_config->dynamic_range <<
+			      MAIN_STREAMX_MISC0_DYNAMIC_RANGE_SHIFT) |
+			     (msa_config->component_format <<
+			      MAIN_STREAMX_MISC0_COMPONENT_FORMAT_SHIFT) |
+			     (msa_config->synchronous_clock_mode);
+
+	msa_config->misc_1 = 0;
+
+	/*
+	 * Determine the number of bits per pixel for the specified color
+	 * component format.
+	 */
+	if (msa_config->component_format ==
+	    MAIN_STREAMX_MISC0_COMPONENT_FORMAT_YCBCR422)
+		/* YCbCr422 color component format. */
+		bits_per_pixel = msa_config->bits_per_color * 2;
+	else
+		/* RGB or YCbCr 4:4:4 color component format. */
+		bits_per_pixel = msa_config->bits_per_color * 3;
+
+	/* Calculate the data per lane. */
+	words_per_line = (msa_config->h_active * bits_per_pixel);
+	if (words_per_line % 16)
+		words_per_line += 16;
+	words_per_line /= 16;
+
+	msa_config->data_per_lane = words_per_line - link_config->lane_count;
+	if (words_per_line % link_config->lane_count)
+		msa_config->data_per_lane += (words_per_line %
+					      link_config->lane_count);
+
+	/*
+	 * Allocate a fixed size for single-stream transport (SST)
+	 * operation.
+	 */
+	msa_config->transfer_unit_size = 64;
+
+	/*
+	 * Calculate the average number of bytes per transfer unit.
+	 * Note: Both the integer and the fractional part is stored in
+	 * avg_bytes_per_tu.
+	 */
+	video_bw = ((msa_config->pixel_clock_hz / 1000) * bits_per_pixel) / 8;
+	link_bw = (link_config->lane_count * link_config->link_rate * 27);
+	msa_config->avg_bytes_per_tu = (video_bw *
+					msa_config->transfer_unit_size) /
+					link_bw;
+
+	/*
+	 * The number of initial wait cycles at the start of a new line
+	 * by the framing logic. This allows enough data to be buffered
+	 * in the input FIFO before video is sent.
+	 */
+	if ((msa_config->avg_bytes_per_tu / 1000) <= 4)
+		msa_config->init_wait = 64;
+	else
+		msa_config->init_wait = msa_config->transfer_unit_size -
+					(msa_config->avg_bytes_per_tu / 1000);
+}
+
+/**
+ * set_line_reset() - Enable/Disable end-of-line-reset
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Disable/enable the end-of-line-reset to the internal video pipe in case of
+ * reduced blanking as required.
+ */
+static void set_line_reset(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	u32 reg_val;
+	u16 h_blank;
+	u16 h_reduced_blank;
+	struct main_stream_attributes *msa_config =
+		&dp_tx->main_stream_attributes;
+
+	h_blank = msa_config->h_total - msa_config->h_active;
+	/* Reduced blanking starts at ceil(0.2 * HTotal). */
+	h_reduced_blank = 2 * msa_config->h_total;
+	if (h_reduced_blank % 10)
+		h_reduced_blank += 10;
+	h_reduced_blank /= 10;
+
+	/* CVT spec. states h_blank is either 80 or 160 for reduced blanking. */
+	reg_val = get_reg(dev, REG_LINE_RESET_DISABLE);
+	if (h_blank < h_reduced_blank &&
+	    (h_blank == 80 || h_blank == 160)) {
+		reg_val |= LINE_RESET_DISABLE_MASK;
+	} else {
+		reg_val &= ~LINE_RESET_DISABLE_MASK;
+	}
+	set_reg(dev, REG_LINE_RESET_DISABLE, reg_val);
+}
+
+/**
+ * clear_msa_values() - Clear MSA values
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Clear the main stream attributes registers of the DisplayPort TX core.
+ */
+static void clear_msa_values(struct udevice *dev)
+{
+	set_reg(dev, REG_MAIN_STREAM_HTOTAL, 0);
+	set_reg(dev, REG_MAIN_STREAM_VTOTAL, 0);
+	set_reg(dev, REG_MAIN_STREAM_POLARITY, 0);
+	set_reg(dev, REG_MAIN_STREAM_HSWIDTH, 0);
+	set_reg(dev, REG_MAIN_STREAM_VSWIDTH, 0);
+	set_reg(dev, REG_MAIN_STREAM_HRES, 0);
+	set_reg(dev, REG_MAIN_STREAM_VRES, 0);
+	set_reg(dev, REG_MAIN_STREAM_HSTART, 0);
+	set_reg(dev, REG_MAIN_STREAM_VSTART, 0);
+	set_reg(dev, REG_MAIN_STREAM_MISC0, 0);
+	set_reg(dev, REG_MAIN_STREAM_MISC1, 0);
+	set_reg(dev, REG_USER_PIXEL_WIDTH, 0);
+	set_reg(dev, REG_USER_DATA_COUNT_PER_LANE, 0);
+	set_reg(dev, REG_M_VID, 0);
+	set_reg(dev, REG_N_VID, 0);
+
+	set_reg(dev, REG_STREAM1, 0);
+	set_reg(dev, REG_TU_SIZE, 0);
+	set_reg(dev, REG_MIN_BYTES_PER_TU, 0);
+	set_reg(dev, REG_FRAC_BYTES_PER_TU, 0);
+	set_reg(dev, REG_INIT_WAIT, 0);
+}
+
+/**
+ * set_msa_values() - Set MSA values
+ * @dev: The LogiCore DP TX device in question
+ *
+ * Set the main stream attributes registers of the DisplayPort TX
+ * core with the values specified in the main stream attributes configuration
+ * structure.
+ */
+static void set_msa_values(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	struct main_stream_attributes *msa_config =
+		&dp_tx->main_stream_attributes;
+
+	printf("       set MSA %u x %u\n", msa_config->h_active,
+	       msa_config->v_active);
+
+	set_reg(dev, REG_MAIN_STREAM_HTOTAL, msa_config->h_total);
+	set_reg(dev, REG_MAIN_STREAM_VTOTAL, msa_config->v_total);
+	set_reg(dev, REG_MAIN_STREAM_POLARITY,
+		msa_config->h_sync_polarity |
+		(msa_config->v_sync_polarity <<
+		 MAIN_STREAMX_POLARITY_VSYNC_POL_SHIFT));
+	set_reg(dev, REG_MAIN_STREAM_HSWIDTH, msa_config->h_sync_width);
+	set_reg(dev, REG_MAIN_STREAM_VSWIDTH, msa_config->v_sync_width);
+	set_reg(dev, REG_MAIN_STREAM_HRES, msa_config->h_active);
+	set_reg(dev, REG_MAIN_STREAM_VRES, msa_config->v_active);
+	set_reg(dev, REG_MAIN_STREAM_HSTART, msa_config->h_start);
+	set_reg(dev, REG_MAIN_STREAM_VSTART, msa_config->v_start);
+	set_reg(dev, REG_MAIN_STREAM_MISC0, msa_config->misc_0);
+	set_reg(dev, REG_MAIN_STREAM_MISC1, msa_config->misc_1);
+	set_reg(dev, REG_USER_PIXEL_WIDTH, msa_config->user_pixel_width);
+
+	set_reg(dev, REG_M_VID, msa_config->pixel_clock_hz / 1000);
+	set_reg(dev, REG_N_VID, msa_config->n_vid);
+	set_reg(dev, REG_USER_DATA_COUNT_PER_LANE, msa_config->data_per_lane);
+
+	set_line_reset(dev);
+
+	set_reg(dev, REG_TU_SIZE, msa_config->transfer_unit_size);
+	set_reg(dev, REG_MIN_BYTES_PER_TU, msa_config->avg_bytes_per_tu / 1000);
+	set_reg(dev, REG_FRAC_BYTES_PER_TU,
+		(msa_config->avg_bytes_per_tu % 1000) * 1024 / 1000);
+	set_reg(dev, REG_INIT_WAIT, msa_config->init_wait);
+}
+
+/*
+ * external API
+ */
+
+/**
+ * logicore_dp_tx_set_msa() - Set given MSA values on device
+ * @dev: The LogiCore DP TX device in question
+ * @msa: The MSA values to set for the device
+ */
+static void logicore_dp_tx_set_msa(struct udevice *dev,
+				   struct logicore_dp_tx_msa *msa)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+
+	memset(&dp_tx->main_stream_attributes, 0,
+	       sizeof(struct main_stream_attributes));
+
+	dp_tx->main_stream_attributes.pixel_clock_hz = msa->pixel_clock_hz;
+	dp_tx->main_stream_attributes.bits_per_color = msa->bits_per_color;
+	dp_tx->main_stream_attributes.h_active = msa->h_active;
+	dp_tx->main_stream_attributes.h_start = msa->h_start;
+	dp_tx->main_stream_attributes.h_sync_polarity = msa->h_sync_polarity;
+	dp_tx->main_stream_attributes.h_sync_width = msa->h_sync_width;
+	dp_tx->main_stream_attributes.h_total = msa->h_total;
+	dp_tx->main_stream_attributes.v_active = msa->v_active;
+	dp_tx->main_stream_attributes.v_start = msa->v_start;
+	dp_tx->main_stream_attributes.v_sync_polarity = msa->v_sync_polarity;
+	dp_tx->main_stream_attributes.v_sync_width = msa->v_sync_width;
+	dp_tx->main_stream_attributes.v_total = msa->v_total;
+	dp_tx->main_stream_attributes.override_user_pixel_width =
+		msa->override_user_pixel_width;
+	dp_tx->main_stream_attributes.user_pixel_width = msa->user_pixel_width;
+	dp_tx->main_stream_attributes.synchronous_clock_mode = 0;
+}
+
+/**
+ * logicore_dp_tx_video_enable() - Enable video output
+ * @dev: The LogiCore DP TX device in question
+ * @msa: The MSA values to set for the device
+ *
+ * Return: 0 if the video was enabled successfully, -ve on error
+ */
+static int logicore_dp_tx_video_enable(struct udevice *dev,
+				       struct logicore_dp_tx_msa *msa)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+	int res;
+	u8 power = 0x01;
+
+	if (!is_connected(dev)) {
+		printf("       no DP sink connected\n");
+		return -EIO;
+	}
+
+	initialize(dev);
+
+	disable_main_link(dev);
+
+	logicore_dp_tx_set_msa(dev, msa);
+
+	get_rx_capabilities(dev);
+
+	printf("       DP sink connected\n");
+	aux_write(dev, DPCD_SET_POWER_DP_PWR_VOLTAGE, 1, &power);
+	set_enhanced_frame_mode(dev, true);
+	cfg_main_link_max(dev);
+	res = establish_link(dev);
+	printf("       establish_link: %s, vs: %d, pe: %d\n",
+	       res ? "failed" : "ok", dp_tx->link_config.vs_level,
+	       dp_tx->link_config.pe_level);
+
+	cfg_msa_recalculate(dev);
+
+	clear_msa_values(dev);
+	set_msa_values(dev);
+
+	enable_main_link(dev);
+
+	return 0;
+}
+
+/*
+ * Driver functions
+ */
+
+static int logicore_dp_tx_enable(struct udevice *dev, int panel_bpp,
+				 const struct display_timing *timing)
+{
+	struct clk pixclock;
+	struct logicore_dp_tx_msa *msa;
+	struct logicore_dp_tx_msa mode_640_480_60 = {
+		.pixel_clock_hz = 25175000,
+		.bits_per_color = 8,
+		.h_active = 640,
+		.h_start = 144,
+		.h_sync_polarity = false,
+		.h_sync_width = 96,
+		.h_total = 800,
+		.v_active = 480,
+		.v_start = 35,
+		.v_sync_polarity = false,
+		.v_sync_width = 2,
+		.v_total = 525,
+		.override_user_pixel_width = false,
+		.user_pixel_width = 0,
+	};
+
+	struct logicore_dp_tx_msa mode_720_400_70 = {
+		.pixel_clock_hz = 28300000,
+		.bits_per_color = 8,
+		.h_active = 720,
+		.h_start = 162,
+		.h_sync_polarity = false,
+		.h_sync_width = 108,
+		.h_total = 900,
+		.v_active = 400,
+		.v_start = 37,
+		.v_sync_polarity = true,
+		.v_sync_width = 2,
+		.v_total = 449,
+		.override_user_pixel_width = false,
+		.user_pixel_width = 0,
+	};
+
+	struct logicore_dp_tx_msa mode_1024_768_60 = {
+		.pixel_clock_hz = 65000000,
+		.bits_per_color = 8,
+		.h_active = 1024,
+		.h_start = 296,
+		.h_sync_polarity = false,
+		.h_sync_width = 136,
+		.h_total = 1344,
+		.v_active = 768,
+		.v_start = 35,
+		.v_sync_polarity = false,
+		.v_sync_width = 2,
+		.v_total = 806,
+		.override_user_pixel_width = false,
+		.user_pixel_width = 0,
+	};
+
+	if (timing->hactive.typ == 1024 && timing->vactive.typ == 768)
+		msa = &mode_1024_768_60;
+	else if (timing->hactive.typ == 720 && timing->vactive.typ == 400)
+		msa = &mode_720_400_70;
+	else
+		msa = &mode_640_480_60;
+
+	if (clk_get_by_index(dev, 0, &pixclock)) {
+		printf("%s: Could not get pixelclock\n", dev->name);
+		return -1;
+	}
+	clk_set_rate(&pixclock, msa->pixel_clock_hz);
+
+	return logicore_dp_tx_video_enable(dev, msa);
+}
+
+static int logicore_dp_tx_probe(struct udevice *dev)
+{
+	struct dp_tx *dp_tx = dev_get_priv(dev);
+
+	dp_tx->s_axi_clk = S_AXI_CLK_DEFAULT;
+	dp_tx->train_adaptive = false;
+	dp_tx->max_link_rate = DPCD_MAX_LINK_RATE_540GBPS;
+	dp_tx->max_lane_count = DPCD_MAX_LANE_COUNT_4;
+
+	dp_tx->base = dev_read_u32_default(dev, "reg", -1);
+
+	return 0;
+}
+
+static const struct dm_display_ops logicore_dp_tx_ops = {
+	.enable = logicore_dp_tx_enable,
+};
+
+static const struct udevice_id logicore_dp_tx_ids[] = {
+	{ .compatible = "gdsys,logicore_dp_tx" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(logicore_dp_tx) = {
+	.name			= "logicore_dp_tx",
+	.id			= UCLASS_DISPLAY,
+	.of_match		= logicore_dp_tx_ids,
+	.probe			= logicore_dp_tx_probe,
+	.priv_auto_alloc_size	= sizeof(struct dp_tx),
+	.ops			= &logicore_dp_tx_ops,
+};

drivers/video/logicore_dp_tx.h

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * logicore_dp_tx.h
+ *
+ * Driver for XILINX LogiCore DisplayPort v6.1 TX (Source)
+ *
+ * (C) Copyright 2016
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
+ */
+
+#ifndef __GDSYS_LOGICORE_DP_TX_H__
+#define __GDSYS_LOGICORE_DP_TX_H__
+
+/*
+ * struct logicore_dp_tx_msa - Main Stream Attributes (MSA)
+ * @pixel_clock_hz:            The pixel clock of the stream (in Hz)
+ * @bits_per_color:            Number of bits per color component
+ * @h_active:                  Horizontal active resolution (pixels)
+ * @h_start:                   Horizontal blank start (in pixels)
+ * @h_sync_polarity:           Horizontal sync polarity
+ *			       (0 = negative | 1 = positive)
+ * @h_sync_width:              Horizontal sync width (pixels)
+ * @h_total:                   Horizontal total (pixels)
+ * @v_active:                  Vertical active resolution (lines)
+ * @v_start:                   Vertical blank start (in lines).
+ * @v_sync_polarity:           Vertical sync polarity
+ *			       (0 = negative | 1 = positive)
+ * @v_sync_width:              Vertical sync width (lines)
+ * @v_total:                   Vertical total (lines)
+ * @override_user_pixel_width: If true, the value stored for user_pixel_width
+ *			       will be used as the pixel width.
+ * @user_pixel_width:          The width of the user data input port.
+ *
+ * This is a stripped down version of struct main_stream_attributes that
+ * contains only the parameters that are not set by cfg_msa_recalculate()
+ */
+struct logicore_dp_tx_msa {
+	u32 pixel_clock_hz;
+	u32 bits_per_color;
+	u16 h_active;
+	u32 h_start;
+	bool h_sync_polarity;
+	u16 h_sync_width;
+	u16 h_total;
+	u16 v_active;
+	u32 v_start;
+	bool v_sync_polarity;
+	u16 v_sync_width;
+	u16 v_total;
+	bool override_user_pixel_width;
+	u32 user_pixel_width;
+};
+
+#endif /* __GDSYS_LOGICORE_DP_TX_H__ */

drivers/video/logicore_dp_tx_regif.h

@@ -0,0 +1,396 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * logicore_dp_tx_regif.h
+ *
+ * Register interface definition for XILINX LogiCore DisplayPort v6.1 TX
+ * (Source) based on Xilinx dp_v3_1 driver sources
+ *
+ * (C) Copyright 2016
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
+ */
+
+#ifndef __GDSYS_LOGICORE_DP_TX_REGIF_H__
+#define __GDSYS_LOGICORE_DP_TX_REGIF_H__
+
+enum {
+	/* link configuration field */
+	REG_LINK_BW_SET =		0x000,
+	REG_LANE_COUNT_SET =		0x004,
+	REG_ENHANCED_FRAME_EN =		0x008,
+	REG_TRAINING_PATTERN_SET =	0x00C,
+	REG_LINK_QUAL_PATTERN_SET =	0x010,
+	REG_SCRAMBLING_DISABLE =	0x014,
+	REG_DOWNSPREAD_CTRL =		0x018,
+	REG_SOFT_RESET =		0x01C,
+};
+
+enum {
+	/* core enables */
+	REG_ENABLE =			0x080,
+	REG_ENABLE_MAIN_STREAM =	0x084,
+	REG_ENABLE_SEC_STREAM =		0x088,
+	REG_FORCE_SCRAMBLER_RESET =	0x0C0,
+	REG_MST_CONFIG =		0x0D0,
+	REG_LINE_RESET_DISABLE =	0x0F0,
+};
+
+enum {
+	/* core ID */
+	REG_VERSION =			0x0F8,
+	REG_CORE_ID =			0x0FC,
+};
+
+enum {
+	/* AUX channel interface */
+	REG_AUX_CMD =			0x100,
+	REG_AUX_WRITE_FIFO =		0x104,
+	REG_AUX_ADDRESS =		0x108,
+	REG_AUX_CLK_DIVIDER =		0x10C,
+	REG_USER_FIFO_OVERFLOW =	0x110,
+	REG_INTERRUPT_SIG_STATE =	0x130,
+	REG_AUX_REPLY_DATA =		0x134,
+	REG_AUX_REPLY_CODE =		0x138,
+	REG_AUX_REPLY_COUNT =		0x13C,
+	REG_INTERRUPT_STATUS =		0x140,
+	REG_INTERRUPT_MASK =		0x144,
+	REG_REPLY_DATA_COUNT =		0x148,
+	REG_REPLY_STATUS =		0x14C,
+	REG_HPD_DURATION =		0x150,
+};
+
+enum {
+	/* main stream attributes for SST / MST STREAM1 */
+	REG_STREAM1_MSA_START =		0x180,
+	REG_MAIN_STREAM_HTOTAL =	0x180,
+	REG_MAIN_STREAM_VTOTAL =	0x184,
+	REG_MAIN_STREAM_POLARITY =	0x188,
+	REG_MAIN_STREAM_HSWIDTH =	0x18C,
+	REG_MAIN_STREAM_VSWIDTH =	0x190,
+	REG_MAIN_STREAM_HRES =		0x194,
+	REG_MAIN_STREAM_VRES =		0x198,
+	REG_MAIN_STREAM_HSTART =	0x19C,
+	REG_MAIN_STREAM_VSTART =	0x1A0,
+	REG_MAIN_STREAM_MISC0 =		0x1A4,
+	REG_MAIN_STREAM_MISC1 =		0x1A8,
+	REG_M_VID =			0x1AC,
+	REG_TU_SIZE =			0x1B0,
+	REG_N_VID =			0x1B4,
+	REG_USER_PIXEL_WIDTH =		0x1B8,
+	REG_USER_DATA_COUNT_PER_LANE =	0x1BC,
+	REG_MAIN_STREAM_INTERLACED =	0x1C0,
+	REG_MIN_BYTES_PER_TU =		0x1C4,
+	REG_FRAC_BYTES_PER_TU =		0x1C8,
+	REG_INIT_WAIT =			0x1CC,
+	REG_STREAM1 =			0x1D0,
+	REG_STREAM2 =			0x1D4,
+	REG_STREAM3 =			0x1D8,
+	REG_STREAM4 =			0x1DC,
+};
+
+enum {
+	/* PHY configuration status */
+	REG_PHY_CONFIG =		0x200,
+	REG_PHY_VOLTAGE_DIFF_LANE_0 =	0x220,
+	REG_PHY_VOLTAGE_DIFF_LANE_1 =	0x224,
+	REG_PHY_VOLTAGE_DIFF_LANE_2 =	0x228,
+	REG_PHY_VOLTAGE_DIFF_LANE_3 =	0x22C,
+	REG_PHY_TRANSMIT_PRBS7 =	0x230,
+	REG_PHY_CLOCK_SELECT =		0x234,
+	REG_PHY_POWER_DOWN =		0x238,
+	REG_PHY_PRECURSOR_LANE_0 =	0x23C,
+	REG_PHY_PRECURSOR_LANE_1 =	0x240,
+	REG_PHY_PRECURSOR_LANE_2 =	0x244,
+	REG_PHY_PRECURSOR_LANE_3 =	0x248,
+	REG_PHY_POSTCURSOR_LANE_0 =	0x24C,
+	REG_PHY_POSTCURSOR_LANE_1 =	0x250,
+	REG_PHY_POSTCURSOR_LANE_2 =	0x254,
+	REG_PHY_POSTCURSOR_LANE_3 =	0x258,
+	REG_PHY_STATUS =		0x280,
+	REG_GT_DRP_COMMAND =		0x2A0,
+	REG_GT_DRP_READ_DATA =		0x2A4,
+	REG_GT_DRP_CHANNEL_STATUS =	0x2A8,
+};
+
+enum {
+	/* DisplayPort audio */
+	REG_AUDIO_CONTROL =		0x300,
+	REG_AUDIO_CHANNELS =		0x304,
+	REG_AUDIO_INFO_DATA =		0x308,
+	REG_AUDIO_MAUD =		0x328,
+	REG_AUDIO_NAUD =		0x32C,
+	REG_AUDIO_EXT_DATA =		0x330,
+};
+
+enum {
+	/* HDCP */
+	REG_HDCP_ENABLE =		0x400,
+};
+
+enum {
+	/* main stream attributes for MST STREAM2, 3, and 4 */
+	REG_STREAM2_MSA_START =		0x500,
+	REG_STREAM3_MSA_START =		0x550,
+	REG_STREAM4_MSA_START =		0x5A0,
+
+	REG_VC_PAYLOAD_BUFFER_ADDR =	0x800,
+};
+
+enum {
+	LINK_BW_SET_162GBPS = 0x06,
+	LINK_BW_SET_270GBPS = 0x0A,
+	LINK_BW_SET_540GBPS = 0x14,
+};
+
+enum {
+	LANE_COUNT_SET_1 = 0x1,
+	LANE_COUNT_SET_2 = 0x2,
+	LANE_COUNT_SET_4 = 0x4,
+};
+
+enum {
+	TRAINING_PATTERN_SET_OFF =	0x0,
+	/* training pattern 1 used for clock recovery */
+	TRAINING_PATTERN_SET_TP1 =	0x1,
+	/* training pattern 2 used for channel equalization */
+	TRAINING_PATTERN_SET_TP2 =	0x2,
+	/*
+	 * training pattern 3 used for channel equalization for cores with DP
+	 * v1.2
+	 */
+	TRAINING_PATTERN_SET_TP3 =	0x3,
+};
+
+enum {
+	LINK_QUAL_PATTERN_SET_OFF =		0x0,
+	/* D10.2 unscrambled test pattern transmitted */
+	LINK_QUAL_PATTERN_SET_D102_TEST =	0x1,
+	/* symbol error rate measurement pattern transmitted */
+	LINK_QUAL_PATTERN_SET_SER_MES =		0x2,
+	/* pseudo random bit sequence 7 transmitted */
+	LINK_QUAL_PATTERN_SET_PRBS7 =		0x3,
+};
+
+enum {
+	SOFT_RESET_VIDEO_STREAM1_MASK =		0x00000001,
+	SOFT_RESET_VIDEO_STREAM2_MASK =		0x00000002,
+	SOFT_RESET_VIDEO_STREAM3_MASK =		0x00000004,
+	SOFT_RESET_VIDEO_STREAM4_MASK =		0x00000008,
+	SOFT_RESET_AUX_MASK =			0x00000080,
+	SOFT_RESET_VIDEO_STREAM_ALL_MASK =	0x0000000F,
+};
+
+enum {
+	MST_CONFIG_MST_EN_MASK =	0x00000001,
+};
+
+enum {
+	LINE_RESET_DISABLE_MASK =	0x1,
+};
+
+#define AUX_CMD_NBYTES_TRANSFER_MASK	0x0000000F
+
+#define AUX_CMD_SHIFT		8
+#define AUX_CMD_MASK			0x00000F00
+enum {
+	AUX_CMD_I2C_WRITE =		0x0,
+	AUX_CMD_I2C_READ =		0x1,
+	AUX_CMD_I2C_WRITE_STATUS =	0x2,
+	AUX_CMD_I2C_WRITE_MOT =		0x4,
+	AUX_CMD_I2C_READ_MOT =		0x5,
+	AUX_CMD_I2C_WRITE_STATUS_MOT =	0x6,
+	AUX_CMD_WRITE =			0x8,
+	AUX_CMD_READ =			0x9,
+};
+
+#define AUX_CLK_DIVIDER_VAL_MASK		0x00FF
+
+#define AUX_CLK_DIVIDER_AUX_SIG_WIDTH_FILT_SHIFT 8
+#define AUX_CLK_DIVIDER_AUX_SIG_WIDTH_FILT_MASK 0xFF00
+
+enum {
+	INTERRUPT_SIG_STATE_HPD_STATE_MASK =		0x00000001,
+	INTERRUPT_SIG_STATE_REQUEST_STATE_MASK =	0x00000002,
+	INTERRUPT_SIG_STATE_REPLY_STATE_MASK =		0x00000004,
+	INTERRUPT_SIG_STATE_REPLY_TIMEOUT_MASK =	0x00000008,
+};
+
+enum {
+	AUX_REPLY_CODE_ACK =		0x0,
+	AUX_REPLY_CODE_I2C_ACK =	0x0,
+	AUX_REPLY_CODE_NACK =		0x1,
+	AUX_REPLY_CODE_DEFER =		0x2,
+	AUX_REPLY_CODE_I2C_NACK =	0x4,
+	AUX_REPLY_CODE_I2C_DEFER =	0x8,
+};
+
+enum {
+	INTERRUPT_STATUS_HPD_IRQ_MASK =			0x00000001,
+	INTERRUPT_STATUS_HPD_EVENT_MASK =		0x00000002,
+	INTERRUPT_STATUS_REPLY_RECEIVED_MASK =		0x00000004,
+	INTERRUPT_STATUS_REPLY_TIMEOUT_MASK =		0x00000008,
+	INTERRUPT_STATUS_HPD_PULSE_DETECTED_MASK =	0x00000010,
+	INTERRUPT_STATUS_EXT_PKT_TXD_MASK =		0x00000020,
+};
+
+enum {
+	INTERRUPT_MASK_HPD_IRQ_MASK =			0x00000001,
+	INTERRUPT_MASK_HPD_EVENT_MASK =			0x00000002,
+	INTERRUPT_MASK_REPLY_RECEIVED_MASK =		0x00000004,
+	INTERRUPT_MASK_REPLY_TIMEOUT_MASK =		0x00000008,
+	INTERRUPT_MASK_HPD_PULSE_DETECTED_MASK =	0x00000010,
+	INTERRUPT_MASK_EXT_PKT_TXD_MASK =		0x00000020,
+};
+
+#define REPLY_STATUS_REPLY_STATUS_STATE_SHIFT 4
+#define REPLY_STATUS_REPLY_STATUS_STATE_MASK	0x00000FF0
+enum {
+	REPLY_STATUS_REPLY_RECEIVED_MASK =	0x00000001,
+	REPLY_STATUS_REPLY_IN_PROGRESS_MASK =	0x00000002,
+	REPLY_STATUS_REQUEST_IN_PROGRESS_MASK =	0x00000004,
+	REPLY_STATUS_REPLY_ERROR_MASK =		0x00000008,
+};
+
+#define MAIN_STREAMX_POLARITY_VSYNC_POL_SHIFT 1
+enum {
+	MAIN_STREAMX_POLARITY_HSYNC_POL_MASK =	0x00000001,
+	MAIN_STREAMX_POLARITY_VSYNC_POL_MASK =	0x00000002,
+};
+
+enum {
+	MAIN_STREAMX_MISC0_SYNC_CLK_MASK = 0x00000001,
+};
+
+#define MAIN_STREAMX_MISC0_COMPONENT_FORMAT_SHIFT 1
+#define MAIN_STREAMX_MISC0_COMPONENT_FORMAT_MASK 0x00000006
+enum {
+	MAIN_STREAMX_MISC0_COMPONENT_FORMAT_RGB =	0x0,
+	MAIN_STREAMX_MISC0_COMPONENT_FORMAT_YCBCR422 =	0x1,
+	MAIN_STREAMX_MISC0_COMPONENT_FORMAT_YCBCR444 =	0x2,
+};
+
+#define MAIN_STREAMX_MISC0_DYNAMIC_RANGE_SHIFT 3
+#define MAIN_STREAMX_MISC0_DYNAMIC_RANGE_MASK 0x00000008
+
+#define MAIN_STREAMX_MISC0_YCBCR_COLORIMETRY_SHIFT 4
+#define MAIN_STREAMX_MISC0_YCBCR_COLORIMETRY_MASK 0x00000010
+
+#define MAIN_STREAMX_MISC0_BDC_SHIFT 5
+#define MAIN_STREAMX_MISC0_BDC_MASK 0x000000E0
+enum {
+	MAIN_STREAMX_MISC0_BDC_6BPC =	0x0,
+	MAIN_STREAMX_MISC0_BDC_8BPC =	0x1,
+	MAIN_STREAMX_MISC0_BDC_10BPC =	0x2,
+	MAIN_STREAMX_MISC0_BDC_12BPC =	0x3,
+	MAIN_STREAMX_MISC0_BDC_16BPC =	0x4,
+};
+
+enum {
+	PHY_CONFIG_PHY_RESET_ENABLE_MASK =		0x0000000,
+	PHY_CONFIG_PHY_RESET_MASK =			0x0000001,
+	PHY_CONFIG_GTTX_RESET_MASK =			0x0000002,
+	PHY_CONFIG_GT_ALL_RESET_MASK =			0x0000003,
+	PHY_CONFIG_TX_PHY_PMA_RESET_MASK =		0x0000100,
+	PHY_CONFIG_TX_PHY_PCS_RESET_MASK =		0x0000200,
+	PHY_CONFIG_TX_PHY_POLARITY_MASK =		0x0000800,
+	PHY_CONFIG_TX_PHY_PRBSFORCEERR_MASK =		0x0001000,
+	PHY_CONFIG_TX_PHY_POLARITY_IND_LANE_MASK =	0x0010000,
+	PHY_CONFIG_TX_PHY_POLARITY_LANE0_MASK =		0x0020000,
+	PHY_CONFIG_TX_PHY_POLARITY_LANE1_MASK =		0x0040000,
+	PHY_CONFIG_TX_PHY_POLARITY_LANE2_MASK =		0x0080000,
+	PHY_CONFIG_TX_PHY_POLARITY_LANE3_MASK =		0x0100000,
+	PHY_CONFIG_TX_PHY_8B10BEN_MASK =		0x0200000,
+};
+
+#define PHY_CONFIG_TX_PHY_LOOPBACK_SHIFT 13
+#define PHY_CONFIG_TX_PHY_LOOPBACK_MASK 0x000E000
+
+enum {
+	PHY_CLOCK_SELECT_162GBPS =	0x1,
+	PHY_CLOCK_SELECT_270GBPS =	0x3,
+	PHY_CLOCK_SELECT_540GBPS =	0x5,
+};
+
+enum {
+	VS_LEVEL_0	= 0x2,
+	VS_LEVEL_1	= 0x5,
+	VS_LEVEL_2	= 0x8,
+	VS_LEVEL_3	= 0xF,
+	VS_LEVEL_OFFSET	= 0x4,
+};
+
+enum {
+	PE_LEVEL_0 =	0x00,
+	PE_LEVEL_1 =	0x0E,
+	PE_LEVEL_2 =	0x14,
+	PE_LEVEL_3 =	0x1B,
+};
+
+enum {
+	PHY_STATUS_RESET_LANE_2_3_DONE_SHIFT =		2,
+	PHY_STATUS_TX_ERROR_LANE_0_SHIFT =		18,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_1_SHIFT =	20,
+	PHY_STATUS_TX_ERROR_LANE_1_SHIFT =		22,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_0_SHIFT =	16,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_2_SHIFT =	24,
+	PHY_STATUS_TX_ERROR_LANE_2_SHIFT =		26,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_3_SHIFT =	28,
+	PHY_STATUS_TX_ERROR_LANE_3_SHIFT =		30,
+};
+
+enum {
+	PHY_STATUS_RESET_LANE_0_DONE_MASK =		0x00000001,
+	PHY_STATUS_RESET_LANE_1_DONE_MASK =		0x00000002,
+	PHY_STATUS_RESET_LANE_2_3_DONE_MASK =		0x0000000C,
+	PHY_STATUS_PLL_LANE0_1_LOCK_MASK =		0x00000010,
+	PHY_STATUS_PLL_LANE2_3_LOCK_MASK =		0x00000020,
+	PHY_STATUS_PLL_FABRIC_LOCK_MASK =		0x00000040,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_0_MASK =	0x00030000,
+	PHY_STATUS_TX_ERROR_LANE_0_MASK =		0x000C0000,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_1_MASK =	0x00300000,
+	PHY_STATUS_TX_ERROR_LANE_1_MASK =		0x00C00000,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_2_MASK =	0x03000000,
+	PHY_STATUS_TX_ERROR_LANE_2_MASK =		0x0C000000,
+	PHY_STATUS_TX_BUFFER_STATUS_LANE_3_MASK =	0x30000000,
+	PHY_STATUS_TX_ERROR_LANE_3_MASK =		0xC0000000,
+};
+
+#define PHY_STATUS_LANE_0_READY_MASK \
+	(PHY_STATUS_RESET_LANE_0_DONE_MASK | \
+	PHY_STATUS_PLL_LANE0_1_LOCK_MASK)
+#define PHY_STATUS_LANES_0_1_READY_MASK \
+	(PHY_STATUS_LANE_0_READY_MASK | \
+	PHY_STATUS_RESET_LANE_1_DONE_MASK)
+/*
+ * PHY_STATUS_ALL_LANES_READY_MASK seems to be missing lanes 0 and 1 in
+ * Xilinx dp_v3_0 implementation
+ */
+#define PHY_STATUS_ALL_LANES_READY_MASK \
+	(PHY_STATUS_LANES_0_1_READY_MASK | \
+	PHY_STATUS_RESET_LANE_2_3_DONE_MASK | \
+	PHY_STATUS_PLL_LANE2_3_LOCK_MASK)
+
+/**
+ * phy_status_lanes_ready_mask() - Generate phy status ready mask
+ * @lane_count: Number of lanes for which to generate a mask
+ *
+ * Return: The generated phy status ready mask
+ */
+static inline u32 phy_status_lanes_ready_mask(u8 lane_count)
+{
+	if (lane_count > 2)
+		return PHY_STATUS_ALL_LANES_READY_MASK;
+
+	if (lane_count == 2)
+		return PHY_STATUS_LANES_0_1_READY_MASK;
+
+	return PHY_STATUS_LANE_0_READY_MASK;
+}
+
+#define GT_DRP_COMMAND_DRP_ADDR_MASK	0x000F
+#define GT_DRP_COMMAND_DRP_RW_CMD_MASK	0x0080
+#define GT_DRP_COMMAND_DRP_W_DATA_SHIFT 16
+#define GT_DRP_COMMAND_DRP_W_DATA_MASK	0xFF00
+
+#define HDCP_ENABLE_BYPASS_DISABLE_MASK	0x0001
+
+#endif /* __GDSYS_LOGICORE_DP_TX_REGIF_H__ */

include/axi.h

@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2017, 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#ifndef _AXI_H_
+#define _AXI_H_
+
+/**
+ * enum axi_size_t - Determine size of AXI transfer
+ * @AXI_SIZE_8:  AXI sransfer is 8-bit wide
+ * @AXI_SIZE_16: AXI sransfer is 16-bit wide
+ * @AXI_SIZE_32: AXI sransfer is 32-bit wide
+ */
+enum axi_size_t {
+	AXI_SIZE_8,
+	AXI_SIZE_16,
+	AXI_SIZE_32,
+};
+
+struct axi_ops {
+	/**
+	 * read() - Read a single value from a specified address on a AXI bus
+	 * @dev:	AXI bus to read from.
+	 * @address:	The address to read from.
+	 * @data:	Pointer to a variable that takes the data value read
+	 *		from the address on the AXI bus.
+	 * @size:	The size of the data to be read.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*read)(struct udevice *dev, ulong address, void *data,
+		    enum axi_size_t size);
+
+	/**
+	 * write() - Write a single value to a specified address on a AXI bus
+	 * @dev:	AXI bus to write to.
+	 * @address:	The address to write to.
+	 * @data:	Pointer to the data value to be written to the address
+	 *		on the AXI bus.
+	 * @size:	The size of the data to write.
+	 *
+	 * Return 0 if OK, -ve on error.
+	 */
+	int (*write)(struct udevice *dev, ulong address, void *data,
+		     enum axi_size_t size);
+};
+
+#define axi_get_ops(dev)	((struct axi_ops *)(dev)->driver->ops)
+
+/**
+ * axi_read() - Read a single value from a specified address on a AXI bus
+ * @dev:	AXI bus to read from.
+ * @address:	The address to read from.
+ * @data:	Pointer to a variable that takes the data value read from the
+ *              address on the AXI bus.
+ * @size:	The size of the data to write.
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int axi_read(struct udevice *dev, ulong address, void *data,
+	     enum axi_size_t size);
+
+/**
+ * axi_write() - Write a single value to a specified address on a AXI bus
+ * @dev:	AXI bus to write to.
+ * @address:	The address to write to.
+ * @data:	Pointer to the data value to be written to the address on the
+ *		AXI bus.
+ * @size:	The size of the data to write.
+ *
+ * Return: 0 if OK, -ve on error.
+ */
+int axi_write(struct udevice *dev, ulong address, void *data,
+	      enum axi_size_t size);
+
+struct axi_emul_ops {
+	/**
+	 * read() - Read a single value from a specified address on a AXI bus
+	 * @dev:	AXI bus to read from.
+	 * @address:	The address to read from.
+	 * @data:	Pointer to a variable that takes the data value read
+	 *		from the address on the AXI bus.
+	 * @size:	The size of the data to be read.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*read)(struct udevice *dev, ulong address, void *data,
+		    enum axi_size_t size);
+
+	/**
+	 * write() - Write a single value to a specified address on a AXI bus
+	 * @dev:	AXI bus to write to.
+	 * @address:	The address to write to.
+	 * @data:	Pointer to the data value to be written to the address
+	 *		on the AXI bus.
+	 * @size:	The size of the data to write.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*write)(struct udevice *dev, ulong address, void *data,
+		     enum axi_size_t size);
+
+	/**
+	 * get_store() - Get address of internal storage of a emulated AXI
+	 *		 device
+	 * @dev:	Emulated AXI device to get the pointer of the internal
+	 *		storage for.
+	 * @storep:	Pointer to the internal storage of the emulated AXI
+	 *		device.
+	 *
+	 * Return: 0 if OK, -ve on error.
+	 */
+	int (*get_store)(struct udevice *dev, u8 **storep);
+};
+
+#endif

include/dm/uclass-id.h

@@ -23,6 +23,7 @@ enum uclass_id {
 	UCLASS_I2C_EMUL,	/* sandbox I2C device emulator */
 	UCLASS_PCI_EMUL,	/* sandbox PCI device emulator */
 	UCLASS_USB_EMUL,	/* sandbox USB bus device emulator */
+	UCLASS_AXI_EMUL,	/* sandbox AXI bus device emulator */
 	UCLASS_SIMPLE_BUS,	/* bus with child devices */
 
 	/* U-Boot uclasses start here - in alphabetical order */
@@ -43,6 +44,7 @@ enum uclass_id {
 	UCLASS_I2C_GENERIC,	/* Generic I2C device */
 	UCLASS_I2C_MUX,		/* I2C multiplexer */
 	UCLASS_IDE,		/* IDE device */
+	UCLASS_AXI,		/* AXI bus */
 	UCLASS_IRQ,		/* Interrupt controller */
 	UCLASS_KEYBOARD,	/* Keyboard input device */
 	UCLASS_LED,		/* Light-emitting diode (LED) */

test/dm/Makefile

@@ -44,4 +44,5 @@ obj-$(CONFIG_DM_VIDEO) += video.o
 obj-$(CONFIG_ADC) += adc.o
 obj-$(CONFIG_SPMI) += spmi.o
 obj-$(CONFIG_WDT) += wdt.o
+obj-$(CONFIG_AXI) += axi.o
 endif

test/dm/axi.c

@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+#include <dm/test.h>
+#include <test/ut.h>
+#include <asm/axi.h>
+
+/* Test that sandbox AXI works correctly */
+static int dm_test_axi_base(struct unit_test_state *uts)
+{
+	struct udevice *bus;
+
+	ut_assertok(uclass_get_device(UCLASS_AXI, 0, &bus));
+
+	return 0;
+}
+
+DM_TEST(dm_test_axi_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test that sandbox PCI bus numbering works correctly */
+static int dm_test_axi_busnum(struct unit_test_state *uts)
+{
+	struct udevice *bus;
+
+	ut_assertok(uclass_get_device_by_seq(UCLASS_AXI, 0, &bus));
+
+	return 0;
+}
+
+DM_TEST(dm_test_axi_busnum, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test that we can use the store device correctly */
+static int dm_test_axi_store(struct unit_test_state *uts)
+{
+	struct udevice *store;
+	u8 tdata1[] = {0x55, 0x66, 0x77, 0x88};
+	u8 tdata2[] = {0xaa, 0xbb, 0xcc, 0xdd};
+	u32 val;
+	u8 *data;
+
+	/* Check that asking for the device automatically fires up AXI */
+	ut_assertok(uclass_get_device(UCLASS_AXI_EMUL, 0, &store));
+	ut_assert(device_active(store));
+
+	axi_get_store(store, &data);
+
+	/* Test reading */
+	memcpy(data, tdata1, ARRAY_SIZE(tdata1));
+	axi_read(store, 0, &val, AXI_SIZE_32);
+	ut_asserteq(0x55667788, val);
+
+	memcpy(data + 3, tdata2, ARRAY_SIZE(tdata2));
+	axi_read(store, 3, &val, AXI_SIZE_32);
+	ut_asserteq(0xaabbccdd, val);
+
+	/* Reset data store */
+	memset(data, 0, 16);
+
+	/* Test writing */
+	val = 0x55667788;
+	axi_write(store, 0, &val, AXI_SIZE_32);
+	ut_asserteq(0, memcmp(data, tdata1, ARRAY_SIZE(tdata1)));
+
+	val = 0xaabbccdd;
+	axi_write(store, 3, &val, AXI_SIZE_32);
+	ut_asserteq(0, memcmp(data + 3, tdata2, ARRAY_SIZE(tdata1)));
+
+	return 0;
+}
+
+DM_TEST(dm_test_axi_store, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);