From: Brad Griffis <bgrif...@ti.com>
In case of RTC+DDR resume, need to restore EMIF context
before initiating hardware leveling.
Signed-off-by: Brad Griffis <bgrif...@ti.com>
[j-keer...@ti.com Fixed the am335x build issues]
Signed-off-by: Keerthy <j-keer...@ti.com>
---
Changes in v2:
* Added the am43xx specific changes under #ifdef
arch/arm/mach-omap2/am33xx/board.c | 3 ---
arch/arm/mach-omap2/am33xx/ddr.c | 14 ++++++++++++++
2 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-omap2/am33xx/board.c
b/arch/arm/mach-omap2/am33xx/board.c
index fe7b8e1e55..5507348981 100644
--- a/arch/arm/mach-omap2/am33xx/board.c
+++ b/arch/arm/mach-omap2/am33xx/board.c
@@ -481,9 +481,6 @@ static void rtc_only(void)
rtc_only_prcm_init();
sdram_init();
- /* Disable EMIF_DEVOFF for normal operation and to exit self-refresh */
- writel(0, &prm_device->emif_ctrl);
-
/* Check EMIF4D_SDRAM_CONFIG[31:29] SDRAM_TYPE */
/* Only perform leveling if SDRAM_TYPE = 3 (DDR3) */
sdrc = readl(AM43XX_EMIF_BASE + AM43XX_SDRAM_CONFIG_OFFSET);
diff --git a/arch/arm/mach-omap2/am33xx/ddr.c b/arch/arm/mach-omap2/am33xx/ddr.c
index 5d947a68c3..c70b6fe31b 100644
--- a/arch/arm/mach-omap2/am33xx/ddr.c
+++ b/arch/arm/mach-omap2/am33xx/ddr.c
@@ -80,6 +80,11 @@ static void configure_mr(int nr, u32 cs)
*/
void config_sdram_emif4d5(const struct emif_regs *regs, int nr)
{
+#ifdef CONFIG_AM43XX
+ struct prm_device_inst *prm_device =
+ (struct prm_device_inst *)PRM_DEVICE_INST;
+#endif
+
writel(0xA0, &emif_reg[nr]->emif_pwr_mgmt_ctrl);
writel(0xA0, &emif_reg[nr]->emif_pwr_mgmt_ctrl_shdw);
writel(regs->zq_config, &emif_reg[nr]->emif_zq_config);
@@ -126,6 +131,15 @@ void config_sdram_emif4d5(const struct emif_regs *regs,
int nr)
writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
+#ifdef CONFIG_AM43XX
+ /*
+ * Disable EMIF_DEVOFF
+ * -> Cold Boot: This is just rewriting the default register value.
+ * -> RTC Resume: Must disable DEVOFF before leveling.
+ */
+ writel(0, &prm_device->emif_ctrl);
+#endif
+
/* Perform hardware leveling for DDR3 */
if (emif_sdram_type(regs->sdram_config) == EMIF_SDRAM_TYPE_DDR3) {
writel(readl(&emif_reg[nr]->emif_ddr_ext_phy_ctrl_36) |
--
2.17.1
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