ARM: DRA7: EMIF: Update SDRAM_REF_CTRL register value
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>
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 @@
{
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 @@
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 @@
*/
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 @@
.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 @@
.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 @@
.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 342f045..7a545ea 100644
--- a/arch/arm/include/asm/emif.h
+++ b/arch/arm/include/asm/emif.h
@@ -1149,6 +1149,7 @@
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 @@
.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 @@
.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,