mmc: sdhci-of-esdhc: fix eMMC couldn't work after kexec

commit 97618aca1440b5addc5c3d78659d3e176be23b80 upstream.

The bit eSDHC_TBCTL[TB_EN] couldn't be reset by eSDHC_SYSCTL[RSTA] which is
used to reset for all. The driver should make sure it's cleared before card
initialization, otherwise the initialization would fail.

Signed-off-by: yinbo.zhu <yinbo.zhu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 1f42437..d74030f 100644 (file)
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -785,6 +785,10 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
        pltfm_host = sdhci_priv(host);
        esdhc = sdhci_pltfm_priv(pltfm_host);
 
+       val = sdhci_readl(host, ESDHC_TBCTL);
+       val &= ~ESDHC_TB_EN;
+       sdhci_writel(host, val, ESDHC_TBCTL);
+
        host_ver = sdhci_readw(host, SDHCI_HOST_VERSION);
        esdhc->vendor_ver = (host_ver & SDHCI_VENDOR_VER_MASK) >>
                             SDHCI_VENDOR_VER_SHIFT;