From: Lokesh Vutla Date: Sat, 5 Mar 2016 12:02:29 +0000 (+0530) Subject: ARM: DRA7: emif: Fix DDR init sequence during warm reset X-Git-Tag: v2016.05-rc1~435 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=4571c519b4581cffc49f40d4066c328df4d6cdf0;p=u-boot ARM: DRA7: emif: Fix DDR init sequence during warm reset Commit (20fae0a - ARM: DRA7: DDR: Enable SR in Power Management Control) enables Self refresh mode by default and during warm reset the EMIF contents are preserved. After warm reset EMIF sees that it is idle and puts DDR in self-refresh. When in SR, leveling operations cannot be done as DDR can only accept SR exit command, so its hanging during warm reset. In order to fix this reset the power management control register before EMIF initialization if it is a warm reset. Signed-off-by: Lokesh Vutla Reviewed-by: Tom Rini --- diff --git a/arch/arm/cpu/armv7/omap-common/emif-common.c b/arch/arm/cpu/armv7/omap-common/emif-common.c index 90c241a007..6b33b45e7c 100644 --- a/arch/arm/cpu/armv7/omap-common/emif-common.c +++ b/arch/arm/cpu/armv7/omap-common/emif-common.c @@ -327,8 +327,10 @@ static void dra7_ddr3_init(u32 base, const struct emif_regs *regs) { struct emif_reg_struct *emif = (struct emif_reg_struct *)base; - if (warm_reset()) + if (warm_reset()) { emif_reset_phy(base); + writel(0x0, &emif->emif_pwr_mgmt_ctrl); + } do_ext_phy_settings(base, regs); writel(regs->ref_ctrl | EMIF_REG_INITREF_DIS_MASK,