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driver/ddr/fsl: Add workaround for erratum A-009801

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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>
This commit is contained in:
Shengzhou Liu 2016-03-16 13:50:23 +08:00 committed by York Sun
parent 4a68489e12
commit 5fc62fe570
3 changed files with 12 additions and 0 deletions
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1
arch/arm/include/asm/arch-fsl-layerscape/config.h
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@ -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

7
drivers/ddr/fsl/fsl_ddr_gen4.c
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@ -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]);

4
include/fsl_ddr_sdram.h
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@ -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 */