mmc: sdhci-pxav3: add pm runtime support

Signed-off-by: Kevin Liu <kliu5@marvell.com>
Signed-off-by: Jialing Fu <jlfu@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 95 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
index f09877fcc3ec..a0cdbc570a83 100644
--- a/drivers/mmc/host/sdhci-pxav3.c
+++ b/drivers/mmc/host/sdhci-pxav3.c
@@ -32,10 +32,14 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
 
 #include "sdhci.h"
 #include "sdhci-pltfm.h"
 
+#define PXAV3_RPM_DELAY_MS     50
+
 #define SD_CLOCK_BURST_SIZE_SETUP               0x10A
 #define SDCLK_SEL       0x100
 #define SDCLK_DELAY_SHIFT       9
@@ -296,9 +300,18 @@ static int sdhci_pxav3_probe(struct platform_device *pdev)
 
         sdhci_get_of_property(pdev);
 
+        pm_runtime_set_active(&pdev->dev);
+        pm_runtime_enable(&pdev->dev);
+        pm_runtime_set_autosuspend_delay(&pdev->dev, PXAV3_RPM_DELAY_MS);
+        pm_runtime_use_autosuspend(&pdev->dev);
+        pm_suspend_ignore_children(&pdev->dev, 1);
+        pm_runtime_get_noresume(&pdev->dev);
+
         ret = sdhci_add_host(host);
         if (ret) {
                 dev_err(&pdev->dev, "failed to add host\n");
+                pm_runtime_forbid(&pdev->dev);
+                pm_runtime_disable(&pdev->dev);
                 goto err_add_host;
         }
 
@@ -311,6 +324,8 @@ static int sdhci_pxav3_probe(struct platform_device *pdev)
                 device_init_wakeup(&pdev->dev, 0);
         }
 
+        pm_runtime_put_autosuspend(&pdev->dev);
+
         return 0;
 
 err_add_host:
@@ -329,7 +344,9 @@ static int sdhci_pxav3_remove(struct platform_device *pdev)
         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
         struct sdhci_pxa *pxa = pltfm_host->priv;
 
+        pm_runtime_get_sync(&pdev->dev);
         sdhci_remove_host(host, 1);
+        pm_runtime_disable(&pdev->dev);
 
         clk_disable_unprepare(pltfm_host->clk);
         clk_put(pltfm_host->clk);
@@ -342,6 +359,83 @@ static int sdhci_pxav3_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sdhci_pxav3_suspend(struct device *dev)
+{
+        int ret;
+        struct sdhci_host *host = dev_get_drvdata(dev);
+
+        pm_runtime_get_sync(dev);
+        ret = sdhci_suspend_host(host);
+        pm_runtime_mark_last_busy(dev);
+        pm_runtime_put_autosuspend(dev);
+
+        return ret;
+}
+
+static int sdhci_pxav3_resume(struct device *dev)
+{
+        int ret;
+        struct sdhci_host *host = dev_get_drvdata(dev);
+
+        pm_runtime_get_sync(dev);
+        ret = sdhci_resume_host(host);
+        pm_runtime_mark_last_busy(dev);
+        pm_runtime_put_autosuspend(dev);
+
+        return ret;
+}
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int sdhci_pxav3_runtime_suspend(struct device *dev)
+{
+        struct sdhci_host *host = dev_get_drvdata(dev);
+        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        unsigned long flags;
+
+        if (pltfm_host->clk) {
+                spin_lock_irqsave(&host->lock, flags);
+                host->runtime_suspended = true;
+                spin_unlock_irqrestore(&host->lock, flags);
+
+                clk_disable_unprepare(pltfm_host->clk);
+        }
+
+        return 0;
+}
+
+static int sdhci_pxav3_runtime_resume(struct device *dev)
+{
+        struct sdhci_host *host = dev_get_drvdata(dev);
+        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        unsigned long flags;
+
+        if (pltfm_host->clk) {
+                clk_prepare_enable(pltfm_host->clk);
+
+                spin_lock_irqsave(&host->lock, flags);
+                host->runtime_suspended = false;
+                spin_unlock_irqrestore(&host->lock, flags);
+        }
+
+        return 0;
+}
+#endif
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops sdhci_pxav3_pmops = {
+        SET_SYSTEM_SLEEP_PM_OPS(sdhci_pxav3_suspend, sdhci_pxav3_resume)
+        SET_RUNTIME_PM_OPS(sdhci_pxav3_runtime_suspend,
+                sdhci_pxav3_runtime_resume, NULL)
+};
+
+#define SDHCI_PXAV3_PMOPS (&sdhci_pxav3_pmops)
+
+#else
+#define SDHCI_PXAV3_PMOPS NULL
+#endif
+
 static struct platform_driver sdhci_pxav3_driver = {
         .driver         = {
                 .name   = "sdhci-pxav3",
@@ -349,7 +443,7 @@ static struct platform_driver sdhci_pxav3_driver = {
                 .of_match_table = sdhci_pxav3_of_match,
 #endif
                 .owner  = THIS_MODULE,
-                .pm     = SDHCI_PLTFM_PMOPS,
+                .pm     = SDHCI_PXAV3_PMOPS,
         },
         .probe          = sdhci_pxav3_probe,
         .remove         = sdhci_pxav3_remove,