[PATCH v4 4/4] mmc: sdhci-of-arasan: add runtime pm support

[Shawn Lin]

This patch add runtime_suspend and runtime_resume for
sdhci-of-arasan. Currently we also power-off phy at
runtime_suspend for power-saving.

Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>

Serise-changes: 4
- remove ifdef for PM callback statement
- fix missing pm_runtime_set_active
- remove pm_runtime_dont_use_autosuspend from remove hook
- add pm_runtime_force_suspend|resume for PM callback to
  deal with suspend invoked from rpm
- remove wrappers of phy ops

---

Changes in v2: None

 drivers/mmc/host/sdhci-of-arasan.c | 85 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 82 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 2d327d4..b044df7 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -30,6 +30,8 @@
 #define CLK_CTRL_TIMEOUT_MASK		(0xf << CLK_CTRL_TIMEOUT_SHIFT)
 #define CLK_CTRL_TIMEOUT_MIN_EXP	13
 
+#define ARASAN_RPM_DELAY_MS		50
+
 /**
  * struct sdhci_arasan_data
  * @clk_ahb:	Pointer to the AHB clock
@@ -71,6 +73,46 @@ static struct sdhci_pltfm_data sdhci_arasan_pdata = {
 			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
 };
 
+#ifdef CONFIG_PM
+static int sdhci_arasan_runtime_suspend(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
+	int ret;
+
+	ret = sdhci_runtime_suspend_host(host);
+	if (ret)
+		return ret;
+
+	if (!IS_ERR(sdhci_arasan->phy))
+		phy_power_off(sdhci_arasan->phy);
+
+	clk_disable_unprepare(sdhci_arasan->clk_ahb);
+	clk_disable_unprepare(pltfm_host->clk);
+
+	return 0;
+}
+
+static int sdhci_arasan_runtime_resume(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
+
+	clk_prepare_enable(pltfm_host->clk);
+	clk_prepare_enable(sdhci_arasan->clk_ahb);
+
+	if (!IS_ERR(sdhci_arasan->phy))
+		phy_power_on(sdhci_arasan->phy);
+
+	return sdhci_runtime_resume_host(host);
+}
+#else
+#define sdhci_arasan_runtime_suspend NULL
+#define sdhci_arasan_runtime_resume NULL
+#endif
+
 #ifdef CONFIG_PM_SLEEP
 /**
  * sdhci_arasan_suspend - Suspend method for the driver
@@ -87,6 +129,12 @@ static int sdhci_arasan_suspend(struct device *dev)
 	struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
 	int ret;
 
+	ret = pm_runtime_force_suspend(dev);
+	if (ret) {
+		dev_err(dev, "problem force suspending\n");
+		return ret;
+	}
+
 	ret = sdhci_suspend_host(host);
 	if (ret)
 		return ret;
@@ -140,18 +188,39 @@ static int sdhci_arasan_resume(struct device *dev)
 		}
 	}
 
-	return sdhci_resume_host(host);
+	ret = sdhci_resume_host(host);
+	if (ret)
+		goto err_resume_host;
+
+	ret = pm_runtime_force_resume(dev);
+	if (ret) {
+		dev_err(dev, "problem force resuming\n");
+		goto err_force_resume;
+	}
+
+	return 0;
 
+err_force_resume:
+	sdhci_suspend_host(host);
+err_resume_host:
+	if (!IS_ERR(sdhci_arasan->phy))
+		phy_power_off(sdhci_arasan->phy);
 err_phy_power:
 	clk_disable_unprepare(pltfm_host->clk);
 err_clk_en:
 	clk_disable_unprepare(sdhci_arasan->clk_ahb);
 	return ret;
 }
+#else
+#define sdhci_arasan_suspend NULL
+#define sdhci_arasan_resume NULL
 #endif /* ! CONFIG_PM_SLEEP */
 
-static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
-			 sdhci_arasan_resume);
+static const struct dev_pm_ops sdhci_arasan_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sdhci_arasan_suspend, sdhci_arasan_resume)
+	SET_RUNTIME_PM_OPS(sdhci_arasan_runtime_suspend,
+				sdhci_arasan_runtime_resume, NULL)
+};
 
 static int sdhci_arasan_probe(struct platform_device *pdev)
 {
@@ -237,6 +306,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 		}
 	}
 
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, ARASAN_RPM_DELAY_MS);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_suspend_ignore_children(&pdev->dev, 1);
+
 	ret = sdhci_add_host(host);
 	if (ret)
 		goto err_pltfm_free;
@@ -244,6 +319,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	return 0;
 
 err_pltfm_free:
+	pm_runtime_disable(&pdev->dev);
 	sdhci_pltfm_free(pdev);
 err_phy_power:
 	if (!IS_ERR(sdhci_arasan->phy))
@@ -265,6 +341,9 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
 	if (!IS_ERR(sdhci_arasan->phy))
 		phy_exit(sdhci_arasan->phy);
 
+	pm_runtime_get_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	clk_disable_unprepare(sdhci_arasan->clk_ahb);
 
 	return sdhci_pltfm_unregister(pdev);
-- 
2.3.7


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