From: Shawn Guo Date: Wed, 22 Aug 2012 15:10:01 +0000 (+0800) Subject: mmc: sdhci-esdhc: break out early if clock is 0 X-Git-Tag: v3.0.44~88 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0afe8813641fda8e31a24add2f753488a8dd7c8a;p=karo-tx-linux.git mmc: sdhci-esdhc: break out early if clock is 0 commit 74f330bceaa7b88d06062e1cac3d519a3dfc041e upstream. Since commit 30832ab56 ("mmc: sdhci: Always pass clock request value zero to set_clock host op") was merged, esdhc_set_clock starts hitting "if (clock == 0)" where ESDHC_SYSTEM_CONTROL has been operated. This causes SDHCI card-detection function being broken. Fix the regression by moving "if (clock == 0)" above ESDHC_SYSTEM_CONTROL operation. Signed-off-by: Shawn Guo Signed-off-by: Chris Ball Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h index c3b08f111942..62ca03af8aca 100644 --- a/drivers/mmc/host/sdhci-esdhc.h +++ b/drivers/mmc/host/sdhci-esdhc.h @@ -48,14 +48,14 @@ static inline void esdhc_set_clock(struct sdhci_host *host, unsigned int clock) int div = 1; u32 temp; + if (clock == 0) + goto out; + temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL); temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN | ESDHC_CLOCK_MASK); sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL); - if (clock == 0) - goto out; - while (host->max_clk / pre_div / 16 > clock && pre_div < 256) pre_div *= 2;