Per the latest erratum document, update step 4 and step 8, only DEBUG_29[21] is changed, all other bits should not be changed.
Signed-off-by: Shengzhou Liu Shengzhou.Liu@nxp.com --- drivers/ddr/fsl/fsl_ddr_gen4.c | 10 +++++++--- include/fsl_ddr_sdram.h | 3 +++ 2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/ddr/fsl/fsl_ddr_gen4.c b/drivers/ddr/fsl/fsl_ddr_gen4.c index 608810d..7cdb700 100644 --- a/drivers/ddr/fsl/fsl_ddr_gen4.c +++ b/drivers/ddr/fsl/fsl_ddr_gen4.c @@ -240,8 +240,10 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs, /* Disable DRAM VRef training */ ddr_out32(&ddr->ddr_cdr2, regs->ddr_cdr2 & ~DDR_CDR2_VREF_TRAIN_EN); - /* Disable deskew */ - ddr_out32(&ddr->debug[28], 0x400); + /* disable transmit bit deskew */ + temp32 = ddr_in32(&ddr->debug[28]); + temp32 |= DDR_TX_BD_DIS; + ddr_out32(&ddr->debug[28], temp32); /* Disable D_INIT */ ddr_out32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2 & ~SDRAM_CFG2_D_INIT); @@ -358,7 +360,9 @@ step2: debug("MR6 = 0x%08x\n", temp32); } ddr_out32(&ddr->sdram_md_cntl, 0); - ddr_out32(&ddr->debug[28], 0); /* Enable deskew */ + temp32 = ddr_in32(&ddr->debug[28]); + temp32 &= ~DDR_TX_BD_DIS; /* Enable deskew */ + ddr_out32(&ddr->debug[28], temp32); ddr_out32(&ddr->debug[1], 0x400); /* restart deskew */ /* wait for idle */ timeout = 40; diff --git a/include/fsl_ddr_sdram.h b/include/fsl_ddr_sdram.h index 44ae7fb..acddf14 100644 --- a/include/fsl_ddr_sdram.h +++ b/include/fsl_ddr_sdram.h @@ -189,6 +189,9 @@ 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_29 register */ +#define DDR_TX_BD_DIS (1 << 10) /* Transmit Bit Deskew Disable */ +
#if (defined(CONFIG_SYS_FSL_DDR_VER) && \ (CONFIG_SYS_FSL_DDR_VER >= FSL_DDR_VER_4_7))