x86: ich-spi: Don't read cached lock status

At present the ICH SPI controller driver reads the controller lock
status from its register in the probe routine and saves the lock
status to a member of priv. Later the driver uses the cached status
from priv to judge whether the controller setting is locked and do
different setup.

But such logic is only valid when there is only the SPI controller
driver that touches the SPI hardware. In fact the lock status change
can be trigged outside the driver, eg: during the fsp_notify() call
when Intel FSP is used.

This changes the driver to read the lock status every time when an
SPI transfer is initiated instead of reading the cached one.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>

drivers/spi/ich.c

@@ -126,7 +126,6 @@ static int ich_init_controller(struct udevice *dev,
 	if (plat->ich_version == ICHV_7) {
 		struct ich7_spi_regs *ich7_spi = sbase;
 
-		ctlr->ichspi_lock = readw(&ich7_spi->spis) & SPIS_LOCK;
 		ctlr->opmenu = offsetof(struct ich7_spi_regs, opmenu);
 		ctlr->menubytes = sizeof(ich7_spi->opmenu);
 		ctlr->optype = offsetof(struct ich7_spi_regs, optype);
@@ -141,7 +140,6 @@ static int ich_init_controller(struct udevice *dev,
 	} else if (plat->ich_version == ICHV_9) {
 		struct ich9_spi_regs *ich9_spi = sbase;
 
-		ctlr->ichspi_lock = readw(&ich9_spi->hsfs) & HSFS_FLOCKDN;
 		ctlr->opmenu = offsetof(struct ich9_spi_regs, opmenu);
 		ctlr->menubytes = sizeof(ich9_spi->opmenu);
 		ctlr->optype = offsetof(struct ich9_spi_regs, optype);
@@ -186,6 +184,23 @@ static inline void spi_use_in(struct spi_trans *trans, unsigned bytes)
 	trans->bytesin -= bytes;
 }
 
+static bool spi_lock_status(struct ich_spi_platdata *plat, void *sbase)
+{
+	int lock = 0;
+
+	if (plat->ich_version == ICHV_7) {
+		struct ich7_spi_regs *ich7_spi = sbase;
+
+		lock = readw(&ich7_spi->spis) & SPIS_LOCK;
+	} else if (plat->ich_version == ICHV_9) {
+		struct ich9_spi_regs *ich9_spi = sbase;
+
+		lock = readw(&ich9_spi->hsfs) & HSFS_FLOCKDN;
+	}
+
+	return lock != 0;
+}
+
 static void spi_setup_type(struct spi_trans *trans, int data_bytes)
 {
 	trans->type = 0xFF;
@@ -219,14 +234,15 @@ static void spi_setup_type(struct spi_trans *trans, int data_bytes)
 	}
 }
 
-static int spi_setup_opcode(struct ich_spi_priv *ctlr, struct spi_trans *trans)
+static int spi_setup_opcode(struct ich_spi_priv *ctlr, struct spi_trans *trans,
+			    bool lock)
 {
 	uint16_t optypes;
 	uint8_t opmenu[ctlr->menubytes];
 
 	trans->opcode = trans->out[0];
 	spi_use_out(trans, 1);
-	if (!ctlr->ichspi_lock) {
+	if (!lock) {
 		/* The lock is off, so just use index 0. */
 		ich_writeb(ctlr, trans->opcode, ctlr->opmenu);
 		optypes = ich_readw(ctlr, ctlr->optype);
@@ -336,6 +352,7 @@ static int ich_spi_xfer(struct udevice *dev, unsigned int bitlen,
 	struct spi_trans *trans = &ctlr->trans;
 	unsigned type = flags & (SPI_XFER_BEGIN | SPI_XFER_END);
 	int using_cmd = 0;
+	bool lock = spi_lock_status(plat, ctlr->base);
 	int ret;
 
 	/* We don't support writing partial bytes */
@@ -399,7 +416,7 @@ static int ich_spi_xfer(struct udevice *dev, unsigned int bitlen,
 		ich_writeb(ctlr, SPIS_CDS | SPIS_FCERR, ctlr->status);
 
 	spi_setup_type(trans, using_cmd ? bytes : 0);
-	opcode_index = spi_setup_opcode(ctlr, trans);
+	opcode_index = spi_setup_opcode(ctlr, trans, lock);
 	if (opcode_index < 0)
 		return -EINVAL;
 	with_address = spi_setup_offset(trans);
@@ -412,7 +429,7 @@ static int ich_spi_xfer(struct udevice *dev, unsigned int bitlen,
 		 * in order to prevent the Management Engine from
 		 * issuing a transaction between WREN and DATA.
 		 */
-		if (!ctlr->ichspi_lock)
+		if (!lock)
 			ich_writew(ctlr, trans->opcode, ctlr->preop);
 		return 0;
 	}

drivers/spi/ich.h

@@ -177,8 +177,6 @@ struct ich_spi_platdata {
 };
 
 struct ich_spi_priv {
-	int ichspi_lock;
-	int locked;
 	int opmenu;
 	int menubytes;
 	void *base;		/* Base of register set */