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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, "yinbo.zhu" <yinbo.zhu@nxp.com>,
        Yangbo Lu <yangbo.lu@nxp.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Subject: [PATCH 4.15 163/163] mmc: sdhci-of-esdhc: fix the mmc error after sleep on ls1046ardb
Date:   Wed, 21 Feb 2018 13:49:52 +0100
Message-Id: <20180221124538.908072794@linuxfoundation.org>
In-Reply-To: <20180221124529.931834518@linuxfoundation.org>
References: <20180221124529.931834518@linuxfoundation.org>
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4.15-stable review patch.  If anyone has any objections, please let me know.

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

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

commit f2bc600008bd6f7f5d0b6b56238d14f95cd454d2 upstream.

When system wakes up from sleep on ls1046ardb, the SD operation fails
with mmc error messages since ESDHC_TB_EN bit couldn't be cleaned by
eSDHC_SYSCTL[RSTA]. It's proper to clean this bit in esdhc_reset()
rather than in probe.

Signed-off-by: yinbo.zhu <yinbo.zhu@nxp.com>
Acked-by: Yangbo Lu <yangbo.lu@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 |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -589,10 +589,18 @@ static void esdhc_pltfm_set_bus_width(st
 
 static void esdhc_reset(struct sdhci_host *host, u8 mask)
 {
+	u32 val;
+
 	sdhci_reset(host, mask);
 
 	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+
+	if (mask & SDHCI_RESET_ALL) {
+		val = sdhci_readl(host, ESDHC_TBCTL);
+		val &= ~ESDHC_TB_EN;
+		sdhci_writel(host, val, ESDHC_TBCTL);
+	}
 }
 
 /* The SCFG, Supplemental Configuration Unit, provides SoC specific
@@ -785,10 +793,6 @@ 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;