ARM: DRA7: DDR: Enable SR in Power Management Control

If EMIF is idle for certain amount of DDR cycles, EMIF will put the
DDR in self refresh mode to save power if EMIF_PWR_MGMT_CTRL register
is programmed. And also before entering suspend-resume ddr needs to
be put in self-refresh. Linux kernel does not program this register
before entering suspend and relies on u-boot setting.
So configuring it in u-boot.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Tested-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/include/asm/emif.h

@@ -914,8 +914,8 @@ struct dmm_lisa_map_regs {
 
 /* Maximum delay before Low Power Modes */
 #define REG_CS_TIM		0x0
-#define REG_SR_TIM		0x0
-#define REG_PD_TIM		0x0
+#define REG_SR_TIM		0xF
+#define REG_PD_TIM		0xF
 
 
 /* EMIF_PWR_MGMT_CTRL register */
@@ -923,7 +923,7 @@ struct dmm_lisa_map_regs {
 	((REG_CS_TIM << EMIF_REG_CS_TIM_SHIFT) & EMIF_REG_CS_TIM_MASK)|\
 	((REG_SR_TIM << EMIF_REG_SR_TIM_SHIFT) & EMIF_REG_SR_TIM_MASK)|\
 	((REG_PD_TIM << EMIF_REG_PD_TIM_SHIFT) & EMIF_REG_PD_TIM_MASK)|\
-	((LP_MODE_DISABLE << EMIF_REG_LP_MODE_SHIFT)\
+	((LP_MODE_SELF_REFRESH << EMIF_REG_LP_MODE_SHIFT)\
 			& EMIF_REG_LP_MODE_MASK) |\
 	((DPD_DISABLE << EMIF_REG_DPD_EN_SHIFT)\
 			& EMIF_REG_DPD_EN_MASK))\