am33xx: Update DDR3 EMIF configuration sequence

[platform/kernel/u-boot.git] / arch / arm / cpu / armv7 / am33xx / ddr.c

diff --git a/arch/arm/cpu/armv7/am33xx/ddr.c b/arch/arm/cpu/armv7/am33xx/ddr.c
index fd9fc4a..448cc40 100644 (file)
--- a/arch/arm/cpu/armv7/am33xx/ddr.c
+++ b/arch/arm/cpu/armv7/am33xx/ddr.c
@@ -45,13 +45,19 @@ static struct ddr_cmdtctrl *ioctrl_reg = {
  */
 void config_sdram(const struct emif_regs *regs)
 {
-       writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl);
-       writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl_shdw);
-       if (regs->zq_config){
+       if (regs->zq_config) {
+               /*
+                * A value of 0x2800 for the REF CTRL will give us
+                * about 570us for a delay, which will be long enough
+                * to configure things.
+                */
+               writel(0x2800, &emif_reg->emif_sdram_ref_ctrl);
                writel(regs->zq_config, &emif_reg->emif_zq_config);
                writel(regs->sdram_config, &cstat->secure_emif_sdram_config);
        }
        writel(regs->sdram_config, &emif_reg->emif_sdram_config);
+       writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl);
+       writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl_shdw);
 }
 
 /**