armv7: Add workaround for USB erratum A-008997

Low Frequency Periodic Singaling (LFPS) Peak-to-Peak Differential
Output Voltage Test Compliance fails using default transmitter settings

Change config of transmitter signal swings by setting register
PCSTXSWINGFULL to 0x47 to pass compliance tests.

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

@@ -2,6 +2,7 @@ config ARCH_LS1021A
 	bool
 	select SYS_FSL_ERRATUM_A008378
 	select SYS_FSL_ERRATUM_A008407
+	select SYS_FSL_ERRATUM_A008997
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009663
 	select SYS_FSL_ERRATUM_A009798
@@ -60,6 +61,11 @@ config SYS_CCI400_OFFSET
 	  Offset for CCI400 base.
 	  CCI400 base addr = CCSRBAR + CCI400_OFFSET
 
+config SYS_FSL_ERRATUM_A008997
+	bool
+	help
+	  Workaround for USB PHY erratum A008997
+
 config SYS_FSL_ERRATUM_A009008
 	bool
 	help

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

@@ -81,6 +81,18 @@ static void erratum_a009798(void)
 #endif /* CONFIG_SYS_FSL_ERRATUM_A009798 */
 }
 
+static void erratum_a008997(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008997
+	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
+
+	clrsetbits_be32(scfg + SCFG_USB3PRM2CR / 4,
+			SCFG_USB_PCSTXSWINGFULL_MASK,
+			SCFG_USB_PCSTXSWINGFULL_VAL);
+#endif /* CONFIG_SYS_FSL_ERRATUM_A008997 */
+}
+
+
 void s_init(void)
 {
 }
@@ -171,6 +183,7 @@ int arch_soc_init(void)
 	/* Erratum */
 	erratum_a009008();
 	erratum_a009798();
+	erratum_a008997();
 
 	return 0;
 }

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

@@ -178,6 +178,9 @@ struct ccsr_gur {
 #define SCFG_USB3PRM1CR			0x070
 #define SCFG_USB_TXVREFTUNE		0x9
 #define SCFG_USB_SQRXTUNE_MASK		0x7
+#define SCFG_USB3PRM2CR			0x074
+#define SCFG_USB_PCSTXSWINGFULL_MASK	0x0000FE00
+#define SCFG_USB_PCSTXSWINGFULL_VAL		0x00008E00
 
 /* Supplemental Configuration Unit */
 struct ccsr_scfg {