diff options
| author | Shengzhou Liu <Shengzhou.Liu@nxp.com> | 2016-03-16 13:50:23 +0800 |
|---|---|---|
| committer | York Sun <york.sun@nxp.com> | 2016-05-17 09:26:53 -0700 |
| commit | 5fc62fe57097e195a8047859cd3c278a5d6790b6 (patch) | |
| tree | 1b22ea733a537daa1866c87543e5cdec7c08d432 | |
| parent | 4a68489e12313a7fa8740463dee0eea2985eb563 (diff) | |
driver/ddr/fsl: Add workaround for erratum A-009801
The initial training for the DDRC may provide results that are not
optimized. The workaround provides better read timing margins.
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
| -rw-r--r-- | arch/arm/include/asm/arch-fsl-layerscape/config.h | 1 | ||||
| -rw-r--r-- | drivers/ddr/fsl/fsl_ddr_gen4.c | 7 | ||||
| -rw-r--r-- | include/fsl_ddr_sdram.h | 4 |
3 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/config.h b/arch/arm/include/asm/arch-fsl-layerscape/config.h index a24dc2805d..6529281c94 100644 --- a/arch/arm/include/asm/arch-fsl-layerscape/config.h +++ b/arch/arm/include/asm/arch-fsl-layerscape/config.h @@ -134,6 +134,7 @@ #define CONFIG_SYS_FSL_ERRATUM_A008751 #define CONFIG_SYS_FSL_ERRATUM_A009635 #define CONFIG_SYS_FSL_ERRATUM_A009663 +#define CONFIG_SYS_FSL_ERRATUM_A009801 #define CONFIG_SYS_FSL_ERRATUM_A009803 #define CONFIG_SYS_FSL_ERRATUM_A009942 diff --git a/drivers/ddr/fsl/fsl_ddr_gen4.c b/drivers/ddr/fsl/fsl_ddr_gen4.c index 7cdb7008b4..1dc0631440 100644 --- a/drivers/ddr/fsl/fsl_ddr_gen4.c +++ b/drivers/ddr/fsl/fsl_ddr_gen4.c @@ -251,6 +251,13 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, } #endif +#ifdef CONFIG_SYS_FSL_ERRATUM_A009801 + temp32 = ddr_in32(&ddr->debug[25]); + temp32 &= ~DDR_CAS_TO_PRE_SUB_MASK; + temp32 |= 9 << DDR_CAS_TO_PRE_SUB_SHIFT; + ddr_out32(&ddr->debug[25], temp32); +#endif + #ifdef CONFIG_SYS_FSL_ERRATUM_A009942 ddr_freq = get_ddr_freq(ctrl_num) / 1000000; tmp = ddr_in32(&ddr->debug[28]); diff --git a/include/fsl_ddr_sdram.h b/include/fsl_ddr_sdram.h index acddf14a3f..486e47e508 100644 --- a/include/fsl_ddr_sdram.h +++ b/include/fsl_ddr_sdram.h @@ -189,6 +189,10 @@ typedef struct ddr4_spd_eeprom_s generic_spd_eeprom_t; #define DDR_MR5_CA_PARITY_LAT_4_CLK 0x1 /* for DDR4-1600/1866/2133 */ #define DDR_MR5_CA_PARITY_LAT_5_CLK 0x2 /* for DDR4-2400 */ +/* DEBUG_26 register */ +#define DDR_CAS_TO_PRE_SUB_MASK 0x0000f000 /* CAS to preamble subtract value */ +#define DDR_CAS_TO_PRE_SUB_SHIFT 12 + /* DEBUG_29 register */ #define DDR_TX_BD_DIS (1 << 10) /* Transmit Bit Deskew Disable */ |