From 7c604e98c2213619af6a8c3064418af9b689cf56 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Mon, 28 Apr 2014 03:38:41 +0200
Subject: [PATCH] arm: mxs: Wait for DRAM to start
Instead of waiting for a fixed period of time and hoping for the best
that the DRAM will start, read back an EMI status register which tells
us exactly when the DRAM started.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
---
arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
index de8841a0e1..97ef67d8c5 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
@@ -274,7 +274,13 @@ static void mx23_mem_init(void)
setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
- early_delay(20000);
+
+ /* Wait for EMI_STAT bit DRAM_HALTED */
+ for (;;) {
+ if (!(readl(MXS_EMI_BASE + 0x10) & (1 << 1)))
+ break;
+ early_delay(1000);
+ }
/* Adjust EMI port priority. */
clrsetbits_le32(0x80020000, 0x1f << 16, 0x2);
--
2.39.5