From: Marek Vasut Date: Mon, 28 Apr 2014 01:38:40 +0000 (+0200) Subject: arm: mxs: Wait when disabling VDDMEM current limiter X-Git-Tag: v2014.10~3^2~19^2~51 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=be0ecdbed5efc7833275701ebdb1ff8ef7ffd4c0;p=platform%2Fkernel%2Fu-boot.git arm: mxs: Wait when disabling VDDMEM current limiter According to i.MX23 datasheet Table 32-17, we must wait for the supply to settle before disabling the current limiter. Indeed, not waiting a little here causes the system to crash at times. Signed-off-by: Marek Vasut Cc: Stefano Babic --- diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c index 3baf4dd..de8841a 100644 --- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c +++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c @@ -240,9 +240,14 @@ static void mx23_mem_setup_vddmem(void) struct mxs_power_regs *power_regs = (struct mxs_power_regs *)MXS_POWER_BASE; + /* We must wait before and after disabling the current limiter! */ + early_delay(10000); + clrbits_le32(&power_regs->hw_power_vddmemctrl, POWER_VDDMEMCTRL_ENABLE_ILIMIT); + early_delay(10000); + } static void mx23_mem_init(void)