[U-Boot] [PATCH v4 7/8] armv7: Add workaround for USB erratum A-008997

[Ran Wang]

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 at nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat at nxp.com>
Signed-off-by: Suresh Gupta <suresh.gupta at nxp.com>
Signed-off-by: Ran Wang <ran.wang_1 at nxp.com>
---
Change in v4:
	Update commit message about register setting.
	Rename USB_PCSTXSWINGFULL to SCFG_USB_PCSTXSWINGFULL.

Change in v3:
- none

Change in v2:
	In function erratum_a008997():
	1.Put a blank line after variable declaration.

 arch/arm/cpu/armv7/ls102xa/Kconfig                |  6 ++++++
 arch/arm/cpu/armv7/ls102xa/soc.c                  | 14 ++++++++++++++
 arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h |  3 +++
 3 files changed, 23 insertions(+)

diff --git a/arch/arm/cpu/armv7/ls102xa/Kconfig b/arch/arm/cpu/armv7/ls102xa/Kconfig
index f09766cf03..ee09dd6fed 100644
--- a/arch/arm/cpu/armv7/ls102xa/Kconfig
+++ b/arch/arm/cpu/armv7/ls102xa/Kconfig
@@ -7,6 +7,7 @@ config ARCH_LS1021A
 	select SYS_FSL_ERRATUM_A010315
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009798
+	select SYS_FSL_ERRATUM_A008997
 	select SYS_FSL_SRDS_1
 	select SYS_HAS_SERDES
 	select SYS_FSL_DDR_BE if SYS_FSL_DDR
@@ -64,6 +65,11 @@ config SYS_FSL_ERRATUM_A009798
 	help
 		Workaround for USB PHY erratum A009798
 
+config SYS_FSL_ERRATUM_A008997
+	bool
+	help
+		Workaround for USB PHY erratum A008997
+
 config SYS_FSL_SRDS_1
 	bool
 
diff --git a/arch/arm/cpu/armv7/ls102xa/soc.c b/arch/arm/cpu/armv7/ls102xa/soc.c
index 487b5cf0ec..ee9eb59f59 100644
--- a/arch/arm/cpu/armv7/ls102xa/soc.c
+++ b/arch/arm/cpu/armv7/ls102xa/soc.c
@@ -83,6 +83,19 @@ 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;
+	u32 val = in_be32(scfg + SCFG_USB3PRM2CR / 4);
+
+	val &= ~SCFG_USB_PCSTXSWINGFULL_MASK;
+	val |= SCFG_USB_PCSTXSWINGFULL_VAL;
+	out_be32(scfg + SCFG_USB3PRM2CR / 4, val);
+#endif /* CONFIG_SYS_FSL_ERRATUM_A008997 */
+}
+
+
 void s_init(void)
 {
 }
@@ -172,6 +185,7 @@ int arch_soc_init(void)
 	/* Erratum */
 	erratum_a009008();
 	erratum_a009798();
+	erratum_a008997();
 
 	return 0;
 }
diff --git a/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h b/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h
index 5762d3308a..e5c06170da 100644
--- a/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h
+++ b/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h
@@ -177,6 +177,9 @@ 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 {
-- 
2.14.1