[PATCH 4.15 162/163] mmc: sdhci-of-esdhc: fix eMMC couldnt work after kexec

Greg Kroah-Hartman
2018-02-21T13:16:36Z

From: yinbo.zhu <yinbo.zhu@nxp.com>

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>

---
drivers/mmc/host/sdhci-of-esdhc.c | 4 ++++
1 file changed, 4 insertions(+)

--- 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_d
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;