linux-kernel - [PATCH 4.9 76/77] mmc: sdhci-of-esdhc: fix eMMC couldnt work after kexec

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Date:   Wed, 21 Feb 2018 13:49:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "yinbo.zhu" <yinbo.zhu@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Subject: [PATCH 4.9 76/77] mmc: sdhci-of-esdhc: fix eMMC couldnt work after kexec

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: yinbo.zhu <yinbo.zhu@....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@....com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -584,6 +584,10 @@ 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;