From 5f7886c5ef40c79b5811f23219167096ab578a91 Mon Sep 17 00:00:00 2001 From: Dong Aisheng Date: Fri, 13 Sep 2013 19:11:36 +0800 Subject: [PATCH] mmc: sdhci-esdhc-imx: correct pre_div for imx6q According to spec, the pre_div for imx6q should be 1, or the biggest clock rate we can get is a half of host clock rate. This may cause we can not get the proper clock rate as we want. e.g. if the desired clock is 200Mhz, however, the host clock is 200Mhz too, then it causes the actual clock we get is 100Mhz due to pre_div is 2. Signed-off-by: Dong Aisheng Acked-by: Shawn Guo Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci-esdhc-imx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index ed00d6ddd5fd..fe48ec3323af 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -510,6 +510,9 @@ static inline void esdhc_pltfm_set_clock(struct sdhci_host *host, goto out; } + if (is_imx6q_usdhc(imx_data)) + pre_div = 1; + temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL); temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN | ESDHC_CLOCK_MASK); -- 2.20.1