[U-Boot] [PATCH 3/8] armv8: Add workaround for USB erratum A-008997

[Ran Wang]

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

Change setting required for transmitter signal swings 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>
---
 arch/arm/cpu/armv8/fsl-layerscape/Kconfig          |  6 ++++++
 arch/arm/cpu/armv8/fsl-layerscape/soc.c            | 23 ++++++++++++++++++++++
 .../include/asm/arch-fsl-layerscape/immap_lsch2.h  |  4 ++++
 3 files changed, 33 insertions(+)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index 63f4eec..867794d 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -24,6 +24,7 @@ config ARCH_LS1043A
 	select SYS_FSL_ERRATUM_A010539
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009798
+	select SYS_FSL_ERRATUM_A008997
 	select SYS_FSL_HAS_DDR3
 	select SYS_FSL_HAS_DDR4
 	select ARCH_EARLY_INIT_R
@@ -46,6 +47,7 @@ config ARCH_LS1046A
 	select SYS_FSL_ERRATUM_A010539
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009798
+	select SYS_FSL_ERRATUM_A008997
 	select SYS_FSL_HAS_DDR4
 	select SYS_FSL_SRDS_2
 	select ARCH_EARLY_INIT_R
@@ -83,6 +85,7 @@ config ARCH_LS2080A
 	select SYS_FSL_ERRATUM_A009203
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009798
+	select SYS_FSL_ERRATUM_A008997
 	select ARCH_EARLY_INIT_R
 	select BOARD_EARLY_INIT_F
 
@@ -232,6 +235,9 @@ config SYS_FSL_ERRATUM_A009008
 config SYS_FSL_ERRATUM_A009798
 	bool "Workaround for USB PHY erratum A009798"
 
+config SYS_FSL_ERRATUM_A008997
+	bool "Workaround for USB PHY erratum A008997"
+
 config MAX_CPUS
 	int "Maximum number of CPUs permitted for Layerscape"
 	default 4 if ARCH_LS1043A
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/soc.c b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
index ad9127a..7ebb8d4 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/soc.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
@@ -94,6 +94,27 @@ static void erratum_a009798(void)
 #endif /* CONFIG_SYS_FSL_ERRATUM_A009798 */
 }
 
+static void erratum_a008997(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008997
+#if defined(CONFIG__ARCH_LS1043A) || defined(CONFIG_ARCH_LS1046A)
+	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
+	u32 val = scfg_in32(scfg + SCFG_USB3PRM2CR_USB1 / 4);
+	val &= ~(0x7F << 9);
+	scfg_out32(scfg + SCFG_USB3PRM2CR_USB1 / 4,
+		   val | (USB_PCSTXSWINGFULL << 9));
+	val = scfg_in32(scfg + SCFG_USB3PRM2CR_USB2 / 4);
+	val &= ~(0x7F << 9);
+	scfg_out32(scfg + SCFG_USB3PRM2CR_USB2 / 4,
+		   val | (USB_PCSTXSWINGFULL << 9));
+	val = scfg_in32(scfg + SCFG_USB3PRM2CR_USB3 / 4);
+	val &= ~(0x7F << 9);
+	scfg_out32(scfg + SCFG_USB3PRM2CR_USB3 / 4,
+		   val | (USB_PCSTXSWINGFULL << 9));
+#endif
+#endif /* CONFIG_SYS_FSL_ERRATUM_A008997 */
+}
+
 #if defined(CONFIG_FSL_LSCH3)
 /*
  * This erratum requires setting a value to eddrtqcr1 to
@@ -242,6 +263,7 @@ void fsl_lsch3_early_init_f(void)
 	erratum_a008336();
 	erratum_a009008();
 	erratum_a009798();
+	erratum_a008997();
 #ifdef CONFIG_CHAIN_OF_TRUST
 	/* In case of Secure Boot, the IBR configures the SMMU
 	* to allow only Secure transactions.
@@ -519,6 +541,7 @@ void fsl_lsch2_early_init_f(void)
 	erratum_a010539();
 	erratum_a009008();
 	erratum_a009798();
+	erratum_a008997();
 }
 #endif
 
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
index 8bd40e8..2e52078 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
@@ -339,10 +339,14 @@ struct ccsr_gur {
 
 #define SCFG_BASE			0x01570000
 #define SCFG_USB3PRM1CR_USB1		0x070
+#define SCFG_USB3PRM2CR_USB1		0x074
 #define SCFG_USB3PRM1CR_USB2		0x07C
+#define SCFG_USB3PRM2CR_USB2		0x080
 #define SCFG_USB3PRM1CR_USB3		0x088
+#define SCFG_USB3PRM2CR_USB3		0x08c
 #define USB_TXVREFTUNE			0x9
 #define USB_SQRXTUNE			0xFC7FFFFF
+#define USB_PCSTXSWINGFULL		0x47
 
 #define SCFG_SNPCNFGCR_SECRDSNP		0x80000000
 #define SCFG_SNPCNFGCR_SECWRSNP		0x40000000
-- 
2.1.0.27.g96db324