From 16197bb8ba5962ab3a9c065c06c91c8c288c0f8e Mon Sep 17 00:00:00 2001 From: Anson Huang Date: Thu, 23 Jan 2014 14:00:19 +0800 Subject: [PATCH] imx6: make sure MMDC_CHx_MASK is clear to avoid warm reset failure Boot ROM may mask MMDC_CHx_MASK in CCM_CCDR(such as i.MX6SL TO1.2), it will cause warm reset fail, need to clear this MMDC_CHx_MASK field to make sure all the i.MX6 series SOCs reset function work. Otherwise, uboot "reset" command will fail, tested on i.MX6SL EVK board with TO1.2. Signed-off-by: Anson Huang --- arch/arm/cpu/armv7/mx6/soc.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index 33a2939415..2aad0a15bb 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -189,10 +189,21 @@ static void set_ahb_rate(u32 val) (div << MXC_CCM_CBCDR_AHB_PODF_OFFSET), &mxc_ccm->cbcdr); } +static void clear_mmdc_ch_mask(void) +{ + struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; + + /* Clear MMDC channel mask */ + writel(0, &mxc_ccm->ccdr); +} + int arch_cpu_init(void) { init_aips(); + /* Need to clear MMDC_CHx_MASK to make warm reset work. */ + clear_mmdc_ch_mask(); + /* * When low freq boot is enabled, ROM will not set AHB * freq, so we need to ensure AHB freq is 132MHz in such -- 2.39.2