[U-Boot] [PATCH v2] driver/ddr/fsl: Add workaround for erratum A-010165

Shengzhou Liu
2016-05-10T08:03:47Z

During DDR-2133 operation, the transmit data eye margins determined
during the memory controller initialization may be sub-optimal, set
DEBUG_29[12] and DEBUG_29[13:16] = 4'b0100 before MEM_EN is set.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
---
v2: rebase

arch/arm/include/asm/arch-fsl-layerscape/config.h | 1 +
drivers/ddr/fsl/fsl_ddr_gen4.c | 10 +++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/arch-fsl-layerscape/config.h b/arch/arm/include/asm/arch-fsl-layerscape/config.h
index 10d17b2..5b0b4ad 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/config.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/config.h
@@ -136,6 +136,7 @@
#define CONFIG_SYS_FSL_ERRATUM_A009663
#define CONFIG_SYS_FSL_ERRATUM_A009803
#define CONFIG_SYS_FSL_ERRATUM_A009942
+#define CONFIG_SYS_FSL_ERRATUM_A010165

/* ARM A57 CORE ERRATA */
#define CONFIG_ARM_ERRATA_826974
diff --git a/drivers/ddr/fsl/fsl_ddr_gen4.c b/drivers/ddr/fsl/fsl_ddr_gen4.c
index 608810d..4a647b0 100644
--- a/drivers/ddr/fsl/fsl_ddr_gen4.c
+++ b/drivers/ddr/fsl/fsl_ddr_gen4.c
@@ -56,7 +56,8 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
u32 vref_seq2[3] = {0xc0, 0xf0, 0x70}; /* for range 2 */
u32 *vref_seq = vref_seq1;
#endif
-#ifdef CONFIG_SYS_FSL_ERRATUM_A009942
+#if defined(CONFIG_SYS_FSL_ERRATUM_A009942) | \
+ defined(CONFIG_SYS_FSL_ERRATUM_A010165)
ulong ddr_freq;
u32 tmp;
#endif
@@ -262,6 +263,13 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
ddr_out32(&ddr->debug[28], tmp | 0x0060007b);
#endif

+#ifdef CONFIG_SYS_FSL_ERRATUM_A010165
+ ddr_freq = get_ddr_freq(ctrl_num) / 1000000;
+ if ((ddr_freq > 1900) && (ddr_freq < 2300)) {
+ tmp = ddr_in32(&ddr->debug[28]);
+ ddr_out32(&ddr->debug[28], tmp | 0x000a0000);
+ }
+#endif
/*
* For RDIMMs, JEDEC spec requires clocks to be stable before reset is
* deasserted. Clocks start when any chip select is enabled and clock
--
2.1.0.27.g96db324