The value in SDRAM_REF_CTRL controls the delay time between the initial rising edge of DDR_RESETn to rising edge of DDR_CKE (JEDEC specs this as 500us). In order to achieve this, SDRAM_REF_CTRL should be written with a value corresponding to 500us delay before starting DDR initialization sequence, and configure proper value at the end of sequence.
Signed-off-by: Lokesh Vutla lokeshvutla@ti.com --- arch/arm/cpu/armv7/omap-common/emif-common.c | 4 +++- arch/arm/cpu/armv7/omap5/sdram.c | 9 ++++++--- arch/arm/include/asm/emif.h | 1 + board/ti/beagle_x15/board.c | 6 ++++-- 4 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap-common/emif-common.c b/arch/arm/cpu/armv7/omap-common/emif-common.c index e601ba1..c01a98f 100644 --- a/arch/arm/cpu/armv7/omap-common/emif-common.c +++ b/arch/arm/cpu/armv7/omap-common/emif-common.c @@ -252,6 +252,8 @@ static void ddr3_init(u32 base, const struct emif_regs *regs) { struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+ writel(regs->ref_ctrl, &emif->emif_sdram_ref_ctrl); + writel(regs->sdram_config_init, &emif->emif_sdram_config); /* * Set SDRAM_CONFIG and PHY control registers to locked frequency * and RL =7. As the default values of the Mode Registers are not @@ -265,7 +267,6 @@ static void ddr3_init(u32 base, const struct emif_regs *regs) writel(regs->sdram_tim2, &emif->emif_sdram_tim_2); writel(regs->sdram_tim3, &emif->emif_sdram_tim_3);
- writel(regs->ref_ctrl, &emif->emif_sdram_ref_ctrl); writel(regs->read_idle_ctrl, &emif->emif_read_idlectrl);
/* @@ -274,6 +275,7 @@ static void ddr3_init(u32 base, const struct emif_regs *regs) */ if (is_dra7xx()) { do_ext_phy_settings(base, regs); + writel(regs->ref_ctrl_final, &emif->emif_sdram_ref_ctrl); writel(regs->sdram_config2, &emif->emif_lpddr2_nvm_config); writel(regs->sdram_config_init, &emif->emif_sdram_config); } else { diff --git a/arch/arm/cpu/armv7/omap5/sdram.c b/arch/arm/cpu/armv7/omap5/sdram.c index e5456ff..61e9aef 100644 --- a/arch/arm/cpu/armv7/omap5/sdram.c +++ b/arch/arm/cpu/armv7/omap5/sdram.c @@ -141,7 +141,8 @@ const struct emif_regs emif_1_regs_ddr3_532_mhz_1cs_dra_es1 = { .sdram_config_init = 0x61851ab2, .sdram_config = 0x61851ab2, .sdram_config2 = 0x08000000, - .ref_ctrl = 0x00001035, + .ref_ctrl = 0x000040F1, + .ref_ctrl_final = 0x00001035, .sdram_tim1 = 0xCCCF36B3, .sdram_tim2 = 0x308F7FDA, .sdram_tim3 = 0x027F88A8, @@ -165,7 +166,8 @@ const struct emif_regs emif_2_regs_ddr3_532_mhz_1cs_dra_es1 = { .sdram_config_init = 0x61851B32, .sdram_config = 0x61851B32, .sdram_config2 = 0x08000000, - .ref_ctrl = 0x00001035, + .ref_ctrl = 0x000040F1, + .ref_ctrl_final = 0x00001035, .sdram_tim1 = 0xCCCF36B3, .sdram_tim2 = 0x308F7FDA, .sdram_tim3 = 0x027F88A8, @@ -189,7 +191,8 @@ const struct emif_regs emif_1_regs_ddr3_666_mhz_1cs_dra_es1 = { .sdram_config_init = 0x61862B32, .sdram_config = 0x61862B32, .sdram_config2 = 0x08000000, - .ref_ctrl = 0x0000144A, + .ref_ctrl = 0x0000493E, + .ref_ctrl_final = 0x0000144A, .sdram_tim1 = 0xD113781C, .sdram_tim2 = 0x308F7FE3, .sdram_tim3 = 0x009F86A8, diff --git a/arch/arm/include/asm/emif.h b/arch/arm/include/asm/emif.h index 2fe5776..5a7a812 100644 --- a/arch/arm/include/asm/emif.h +++ b/arch/arm/include/asm/emif.h @@ -1122,6 +1122,7 @@ struct emif_regs { u32 sdram_config; u32 sdram_config2; u32 ref_ctrl; + u32 ref_ctrl_final; u32 sdram_tim1; u32 sdram_tim2; u32 sdram_tim3; diff --git a/board/ti/beagle_x15/board.c b/board/ti/beagle_x15/board.c index db96e34..3a7e04d 100644 --- a/board/ti/beagle_x15/board.c +++ b/board/ti/beagle_x15/board.c @@ -47,7 +47,8 @@ static const struct emif_regs beagle_x15_emif1_ddr3_532mhz_emif_regs = { .sdram_config_init = 0x61851b32, .sdram_config = 0x61851b32, .sdram_config2 = 0x00000000, - .ref_ctrl = 0x00001035, + .ref_ctrl = 0x000040F1, + .ref_ctrl_final = 0x00001035, .sdram_tim1 = 0xceef266b, .sdram_tim2 = 0x328f7fda, .sdram_tim3 = 0x027f88a8, @@ -103,7 +104,8 @@ static const struct emif_regs beagle_x15_emif2_ddr3_532mhz_emif_regs = { .sdram_config_init = 0x61851b32, .sdram_config = 0x61851b32, .sdram_config2 = 0x00000000, - .ref_ctrl = 0x00001035, + .ref_ctrl = 0x000040F1, + .ref_ctrl_final = 0x00001035, .sdram_tim1 = 0xceef266b, .sdram_tim2 = 0x328f7fda, .sdram_tim3 = 0x027f88a8,