linux-kernel - [PATCH v1 1/1] sdhci-of-dwcmshc: disable PM runtime in dwcmshc

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Message-ID: <b9155963ffb12d18375002bf9ac9a3f98b727fc8.1710854108.git.limings@nvidia.com>
Date: Tue, 19 Mar 2024 12:16:16 -0400
From: Liming Sun <limings@...dia.com>
To: Adrian Hunter <adrian.hunter@...el.com>, Ulf Hansson
	<ulf.hansson@...aro.org>, David Thompson <davthompson@...dia.com>, Shawn Lin
	<shawn.lin@...k-chips.com>
CC: Liming Sun <limings@...dia.com>, <linux-mmc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v1 1/1] sdhci-of-dwcmshc: disable PM runtime in dwcmshc_remove()

This commit disables PM runtime in dwcmshc_remove() to avoid the
error message below when reloading the sdhci-of-dwcmshc.ko

  sdhci-dwcmshc MLNXBF30:00: Unbalanced pm_runtime_enable!

Fixes: 48fe8fadbe5e ("mmc: sdhci-of-dwcmshc: Add runtime PM operations")
Reviewed-by: David Thompson <davthompson@...dia.com>
Signed-off-by: Liming Sun <limings@...dia.com>
---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index ab4b964d4058..1d8f5a76096a 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -999,6 +999,17 @@ static int dwcmshc_probe(struct platform_device *pdev)
 	return err;
 }
 
+static void dwcmshc_disable_card_clk(struct sdhci_host *host)
+{
+	u16 ctrl;
+
+	ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+	if (ctrl & SDHCI_CLOCK_CARD_EN) {
+		ctrl &= ~SDHCI_CLOCK_CARD_EN;
+		sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
+	}
+}
+
 static void dwcmshc_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
@@ -1006,8 +1017,14 @@ static void dwcmshc_remove(struct platform_device *pdev)
 	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
 	struct rk35xx_priv *rk_priv = priv->priv;
 
+	pm_runtime_get_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+
 	sdhci_remove_host(host, 0);
 
+	dwcmshc_disable_card_clk(host);
+
 	clk_disable_unprepare(pltfm_host->clk);
 	clk_disable_unprepare(priv->bus_clk);
 	if (rk_priv)
@@ -1099,17 +1116,6 @@ static void dwcmshc_enable_card_clk(struct sdhci_host *host)
 	}
 }
 
-static void dwcmshc_disable_card_clk(struct sdhci_host *host)
-{
-	u16 ctrl;
-
-	ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
-	if (ctrl & SDHCI_CLOCK_CARD_EN) {
-		ctrl &= ~SDHCI_CLOCK_CARD_EN;
-		sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
-	}
-}
-
 static int dwcmshc_runtime_suspend(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
-- 
2.30.1