From 97618aca1440b5addc5c3d78659d3e176be23b80 Mon Sep 17 00:00:00 2001
From: "yinbo.zhu" <yinbo.zhu@nxp.com>
Date: Wed, 8 Nov 2017 17:09:50 +0800
Subject: [PATCH] mmc: sdhci-of-esdhc: fix eMMC couldn't work after kexec
Git-commit: 97618aca1440b5addc5c3d78659d3e176be23b80
Patch-mainline: v4.16-rc1
References: bsc#1051510

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

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

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 1f424374bbbb..d74030f3bd12 100644
--- 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;
-- 
2.18.0