[PATCH v3 2/3] mmc: sdhci-of-dwcmshc: Add runtime PM support

[Shawn Lin]

This patch adds runtime PM support.

Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
---

Changes in v2: None

 drivers/mmc/host/sdhci-of-dwcmshc.c | 51 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index 46b1ce7..fc917ed 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/sizes.h>
 
@@ -551,6 +552,13 @@ static int dwcmshc_probe(struct platform_device *pdev)
 	if (err)
 		goto err_setup_host;
 
+	pm_runtime_get_noresume(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+
 	return 0;
 
 err_setup_host:
@@ -580,6 +588,11 @@ static int dwcmshc_remove(struct platform_device *pdev)
 	if (rk_priv)
 		clk_bulk_disable_unprepare(RK35xx_MAX_CLKS,
 					   rk_priv->rockchip_clks);
+
+	pm_runtime_get_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
+
 	sdhci_pltfm_free(pdev);
 
 	return 0;
@@ -638,7 +651,43 @@ static int dwcmshc_resume(struct device *dev)
 }
 #endif
 
-static SIMPLE_DEV_PM_OPS(dwcmshc_pmops, dwcmshc_suspend, dwcmshc_resume);
+#ifdef CONFIG_PM
+static int dwcmshc_runtime_suspend(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	u16 data;
+	int ret;
+
+	ret = sdhci_runtime_suspend_host(host);
+	if (ret)
+		return ret;
+
+	data = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+	data &= ~SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, data, SDHCI_CLOCK_CONTROL);
+
+	return 0;
+}
+
+static int dwcmshc_runtime_resume(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	u16 data;
+
+	data = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+	data |= SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, data, SDHCI_CLOCK_CONTROL);
+
+	return sdhci_runtime_resume_host(host, 0);
+}
+#endif
+
+static const struct dev_pm_ops dwcmshc_pmops = {
+	SET_SYSTEM_SLEEP_PM_OPS(dwcmshc_suspend,
+				dwcmshc_resume)
+	SET_RUNTIME_PM_OPS(dwcmshc_runtime_suspend,
+			   dwcmshc_runtime_resume, NULL)
+};
 
 static struct platform_driver sdhci_dwcmshc_driver = {
 	.driver	= {
-- 
2.7.4