linux-kernel - [PATCH AUTOSEL 5.4 006/108] mmc: sdhci-esdhc-imx: restore pin state when resume back

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Date:   Sat, 11 Apr 2020 19:08:01 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Haibo Chen <haibo.chen@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sasha Levin <sashal@...nel.org>, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 006/108] mmc: sdhci-esdhc-imx: restore pin state when resume back

From: Haibo Chen <haibo.chen@....com>

[ Upstream commit af8fade4bd7bc7bf49851832a20166213e032978 ]

In some low power mode, SoC will lose the pin state, so need to restore
the pin state when resume back.

Signed-off-by: Haibo Chen <haibo.chen@....com>
Link: https://lore.kernel.org/r/1582100757-20683-8-git-send-email-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index dccb4df465126..ca1566d4ccab1 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1624,7 +1624,11 @@ static int sdhci_esdhc_suspend(struct device *dev)
 	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
 		mmc_retune_needed(host->mmc);
 
-	return sdhci_suspend_host(host);
+	ret = sdhci_suspend_host(host);
+	if (!ret)
+		return pinctrl_pm_select_sleep_state(dev);
+
+	return ret;
 }
 
 static int sdhci_esdhc_resume(struct device *dev)
@@ -1632,6 +1636,10 @@ static int sdhci_esdhc_resume(struct device *dev)
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	int ret;
 
+	ret = pinctrl_pm_select_default_state(dev);
+	if (ret)
+		return ret;
+
 	/* re-initialize hw state in case it's lost in low power mode */
 	sdhci_esdhc_imx_hwinit(host);
 
-- 
2.20.1