linux-kernel - [PATCH] mmc: sdhci-msm: Add pm

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Date:	Thu, 16 Jun 2016 18:05:09 +0530
From:	Pramod Gurav <pramod.gurav@...aro.org>
To:	adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pramod Gurav <pramod.gurav@...aro.org>
Subject: [PATCH] mmc: sdhci-msm: Add pm_runtime and system PM support

Provides runtime PM callbacks to enable and disable clock resources
when idle. Also support system PM callbacks to be called during system
suspend and resume.

Signed-off-by: Pramod Gurav <pramod.gurav@...aro.org>
---
 drivers/mmc/host/sdhci-msm.c | 57 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 0653fe7..f4394c8 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -18,6 +18,7 @@
 #include <linux/of_device.h>
 #include <linux/delay.h>
 #include <linux/mmc/mmc.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
 #include "sdhci-pltfm.h"
@@ -549,6 +550,11 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	if (ret)
 		goto clk_disable;
 
+	platform_set_drvdata(pdev, msm_host);
+
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
 	return 0;
 
 clk_disable:
@@ -580,12 +586,63 @@ static int sdhci_msm_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int sdhci_msm_runtime_suspend(struct device *dev)
+{
+	struct sdhci_msm_host *msm_host = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(msm_host->clk);
+	clk_disable_unprepare(msm_host->pclk);
+
+	return 0;
+}
+
+static int sdhci_msm_runtime_resume(struct device *dev)
+{
+	struct sdhci_msm_host *msm_host = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(msm_host->clk);
+	if (ret) {
+		dev_err(dev, "clk_enable failed: %d\n", ret);
+		return ret;
+	}
+	ret = clk_prepare_enable(msm_host->pclk);
+	if (ret) {
+		dev_err(dev, "clk_enable failed: %d\n", ret);
+		clk_disable_unprepare(msm_host->clk);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sdhci_msm_suspend(struct device *dev)
+{
+	pm_runtime_force_suspend(dev);
+
+	return 0;
+}
+
+static int sdhci_msm_resume(struct device *dev)
+{
+	pm_runtime_force_resume(dev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops sdhci_msm_pm_ops = {
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(sdhci_msm_suspend, sdhci_msm_resume)
+	SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend, sdhci_msm_runtime_resume,
+				NULL)
+};
+
 static struct platform_driver sdhci_msm_driver = {
 	.probe = sdhci_msm_probe,
 	.remove = sdhci_msm_remove,
 	.driver = {
 		   .name = "sdhci_msm",
 		   .of_match_table = sdhci_msm_dt_match,
+		   .pm = &sdhci_msm_pm_ops,
 	},
 };
 
-- 
1.8.2.1