armv7: 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 Receive
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/armv7/ls102xa/Kconfig

@@ -4,6 +4,7 @@ config ARCH_LS1021A
 	select SYS_FSL_ERRATUM_A008407
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009663
+	select SYS_FSL_ERRATUM_A009798
 	select SYS_FSL_ERRATUM_A009942
 	select SYS_FSL_ERRATUM_A010315
 	select SYS_FSL_HAS_CCI400
@@ -64,6 +65,11 @@ config SYS_FSL_ERRATUM_A009008
 	help
 	  Workaround for USB PHY erratum A009008
 
+config SYS_FSL_ERRATUM_A009798
+	bool
+	help
+	  Workaround for USB PHY erratum A009798
+
 config SYS_FSL_ERRATUM_A010315
 	bool "Workaround for PCIe erratum A010315"
 

arch/arm/cpu/armv7/ls102xa/soc.c

@@ -71,6 +71,15 @@ static void erratum_a009008(void)
 #endif /* CONFIG_SYS_FSL_ERRATUM_A009008 */
 }
 
+static void erratum_a009798(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A009798
+	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
+
+	clrbits_be32(scfg + SCFG_USB3PRM1CR / 4,
+			SCFG_USB_SQRXTUNE_MASK << 23);
+#endif /* CONFIG_SYS_FSL_ERRATUM_A009798 */
+}
 
 void s_init(void)
 {
@@ -161,6 +170,7 @@ int arch_soc_init(void)
 
 	/* Erratum */
 	erratum_a009008();
+	erratum_a009798();
 
 	return 0;
 }

arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h

@@ -177,6 +177,7 @@ struct ccsr_gur {
 #define SCFG_BASE			0x01570000
 #define SCFG_USB3PRM1CR			0x070
 #define SCFG_USB_TXVREFTUNE		0x9
+#define SCFG_USB_SQRXTUNE_MASK		0x7
 
 /* Supplemental Configuration Unit */
 struct ccsr_scfg {