From 7c604e98c2213619af6a8c3064418af9b689cf56 Mon Sep 17 00:00:00 2001 From: Marek Vasut 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 Cc: Stefano Babic --- 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); -- 2.30.2