armv8: Add workaround for USB erratum A-009798

The default setting for USB High Speed Squelch Threshold results
in a threshold close to or lower than 100mV. This leads to Receiver
Compliance test failure for a 100mV threshold.

Shift the threshold from ~100mV towards ~130mV by setting SQRXTUNE
to 0x0 to pass USB High Speed Receiver Sensitivity Compliance test.

Signed-off-by: Sriram Dash <sriram.dash@nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Signed-off-by: Suresh Gupta <suresh.gupta@nxp.com>
Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
[YS: Reordered Kconfig options]
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/fsl-layerscape/Kconfig

@@ -19,6 +19,7 @@ config ARCH_LS1043A
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009660
 	select SYS_FSL_ERRATUM_A009663
+	select SYS_FSL_ERRATUM_A009798
 	select SYS_FSL_ERRATUM_A009929
 	select SYS_FSL_ERRATUM_A009942
 	select SYS_FSL_ERRATUM_A010315
@@ -41,6 +42,7 @@ config ARCH_LS1046A
 	select SYS_FSL_ERRATUM_A008511
 	select SYS_FSL_ERRATUM_A008850
 	select SYS_FSL_ERRATUM_A009008
+	select SYS_FSL_ERRATUM_A009798
 	select SYS_FSL_ERRATUM_A009801
 	select SYS_FSL_ERRATUM_A009803
 	select SYS_FSL_ERRATUM_A009942
@@ -105,6 +107,7 @@ config ARCH_LS2080A
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009635
 	select SYS_FSL_ERRATUM_A009663
+	select SYS_FSL_ERRATUM_A009798
 	select SYS_FSL_ERRATUM_A009801
 	select SYS_FSL_ERRATUM_A009803
 	select SYS_FSL_ERRATUM_A009942
@@ -254,6 +257,9 @@ endmenu
 config SYS_FSL_ERRATUM_A009008
 	bool "Workaround for USB PHY erratum A009008"
 
+config SYS_FSL_ERRATUM_A009798
+	bool "Workaround for USB PHY erratum A009798"
+
 config SYS_FSL_ERRATUM_A010315
 	bool "Workaround for PCIe erratum A010315"
 

arch/arm/cpu/armv8/fsl-layerscape/soc.c

@@ -65,6 +65,7 @@ static void erratum_a009008(void)
 {
 #ifdef CONFIG_SYS_FSL_ERRATUM_A009008
 	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
+
 #if defined(CONFIG_ARCH_LS1043A) || defined(CONFIG_ARCH_LS1046A)
 	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB1);
 	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB2);
@@ -75,6 +76,27 @@ static void erratum_a009008(void)
 #endif /* CONFIG_SYS_FSL_ERRATUM_A009008 */
 }
 
+static inline void set_usb_sqrxtune(u32 __iomem *scfg, u32 offset)
+{
+	scfg_clrbits32(scfg + offset / 4,
+			SCFG_USB_SQRXTUNE_MASK << 23);
+}
+
+static void erratum_a009798(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A009798
+	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
+
+#if defined(CONFIG_ARCH_LS1043A) || defined(CONFIG_ARCH_LS1046A)
+	set_usb_sqrxtune(scfg, SCFG_USB3PRM1CR_USB1);
+	set_usb_sqrxtune(scfg, SCFG_USB3PRM1CR_USB2);
+	set_usb_sqrxtune(scfg, SCFG_USB3PRM1CR_USB3);
+#elif defined(CONFIG_ARCH_LS2080A)
+	set_usb_sqrxtune(scfg, SCFG_USB3PRM1CR);
+#endif
+#endif /* CONFIG_SYS_FSL_ERRATUM_A009798 */
+}
+
 #if defined(CONFIG_FSL_LSCH3)
 /*
  * This erratum requires setting a value to eddrtqcr1 to
@@ -222,6 +244,7 @@ void fsl_lsch3_early_init_f(void)
 	erratum_a008514();
 	erratum_a008336();
 	erratum_a009008();
+	erratum_a009798();
 #ifdef CONFIG_CHAIN_OF_TRUST
 	/* In case of Secure Boot, the IBR configures the SMMU
 	* to allow only Secure transactions.
@@ -501,6 +524,7 @@ void fsl_lsch2_early_init_f(void)
 	erratum_a009660();
 	erratum_a010539();
 	erratum_a009008();
+	erratum_a009798();
 }
 #endif
 

arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h

@@ -342,6 +342,7 @@ struct ccsr_gur {
 #define SCFG_USB3PRM1CR_USB2		0x07C
 #define SCFG_USB3PRM1CR_USB3		0x088
 #define SCFG_USB_TXVREFTUNE			0x9
+#define SCFG_USB_SQRXTUNE_MASK		0x7
 
 #define SCFG_SNPCNFGCR_SECRDSNP		0x80000000
 #define SCFG_SNPCNFGCR_SECWRSNP		0x40000000

arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h

@@ -134,6 +134,7 @@
 #define SCFG_USB3PRM1CR			0x000
 #define SCFG_USB3PRM1CR_INIT		0x27672b2a
 #define SCFG_USB_TXVREFTUNE		0x9
+#define SCFG_USB_SQRXTUNE_MASK	0x7
 #define SCFG_QSPICLKCTLR	0x10
 
 #define TP_ITYP_AV		0x00000001	/* Initiator available */