From 784229cc25feee0bb3f2bba6c1318f4d73c293e0 Mon Sep 17 00:00:00 2001
From: Lokesh Vutla <lokeshvutla@ti.com>
Date: Tue, 29 May 2012 19:26:42 +0000
Subject: OMAP4+: Handle sdram init after warm reset

EMIF and DDR device state are preserved in warmreset.  Redoing the full
initialisation would cause unexpected behaviour.  Do only partial
initialisation to account for frequency change.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: R Sricharan <r.sricharan@ti.com>
Signed-off-by: Senthilvadivu Guruswamy <svadivu@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 23cf619..edc63fa 100644
--- a/arch/arm/cpu/armv7/omap-common/emif-common.c
+++ b/arch/arm/cpu/armv7/omap-common/emif-common.c
@@ -990,7 +990,7 @@ struct lpddr2_device_details *emif_get_device_details(u32 emif_nr, u8 cs,
 		return NULL;
 
 	/* Do the minimum init for mode register accesses */
-	if (!running_from_sdram()) {
+	if (!(running_from_sdram() || warm_reset())) {
 		phy = get_ddr_phy_ctrl_1(get_sys_clk_freq() / 2, RL_BOOT);
 		writel(phy, &emif->emif_ddr_phy_ctrl_1);
 	}
@@ -1070,7 +1070,7 @@ static void do_sdram_init(u32 base)
 	 * Changing the timing registers in EMIF can happen(going from one
 	 * OPP to another)
 	 */
-	if (!in_sdram) {
+	if (!(in_sdram || warm_reset())) {
 		if (omap_revision() != OMAP5432_ES1_0)
 			lpddr2_init(base, regs);
 		else
@@ -1242,7 +1242,7 @@ void sdram_init(void)
 	in_sdram = running_from_sdram();
 	debug("in_sdram = %d\n", in_sdram);
 
-	if (!in_sdram) {
+	if (!(in_sdram || warm_reset())) {
 		if (omap_rev != OMAP5432_ES1_0)
 			bypass_dpll(&prcm->cm_clkmode_dpll_core);
 		else
@@ -1252,8 +1252,10 @@ void sdram_init(void)
 	do_sdram_init(EMIF1_BASE);
 	do_sdram_init(EMIF2_BASE);
 
-	if (!in_sdram) {
+	if (!in_sdram)
 		dmm_init(DMM_BASE);
+
+	if (!(in_sdram || warm_reset())) {
 		emif_post_init_config(EMIF1_BASE);
 		emif_post_init_config(EMIF2_BASE);
 	}
-- 
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