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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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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 */