mmc: dw_mmc: add runtime PM callback

This patch add dw_mci_runtime_suspend/resume interfaces
and expose it to dw_mci variant driver to support runtime
PM.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index df478ae72e23235ca8939128b2ad37497aaf4b71..875ce2d0ac872c9af61eb70995ef27cd54c4b913 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -3267,7 +3267,7 @@ EXPORT_SYMBOL(dw_mci_remove);
 
 
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM
 /*
  * TODO: we should probably disable the clock to the card in the suspend path.
  */
@@ -3325,7 +3325,35 @@ int dw_mci_resume(struct dw_mci *host)
        return 0;
 }
 EXPORT_SYMBOL(dw_mci_resume);
-#endif /* CONFIG_PM_SLEEP */
+
+int dw_mci_runtime_suspend(struct device *dev)
+{
+       int err = 0;
+       struct dw_mci *host = dev_get_drvdata(dev);
+
+       err = dw_mci_suspend(host);
+       if (err)
+               return err;
+
+       clk_disable_unprepare(host->ciu_clk);
+
+       return err;
+}
+EXPORT_SYMBOL(dw_mci_runtime_suspend);
+
+int dw_mci_runtime_resume(struct device *dev)
+{
+       int ret = 0;
+       struct dw_mci *host = dev_get_drvdata(dev);
+
+       ret = clk_prepare_enable(host->ciu_clk);
+       if (ret)
+               return ret;
+
+       return dw_mci_resume(host);
+}
+EXPORT_SYMBOL(dw_mci_runtime_resume);
+#endif /* CONFIG_PM */
 
 static int __init dw_mci_init(void)
 {

diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index e8cd2dec3263d308ed0ebc9f52271c4b72bc5f05..d14a391eb7092b910ec8c186cec6c56daa8e9297 100644 (file)
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -234,9 +234,11 @@
 
 extern int dw_mci_probe(struct dw_mci *host);
 extern void dw_mci_remove(struct dw_mci *host);
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM
 extern int dw_mci_suspend(struct dw_mci *host);
 extern int dw_mci_resume(struct dw_mci *host);
+extern int dw_mci_runtime_suspend(struct device *device);
+extern int dw_mci_runtime_resume(struct device *device);
 #endif
 
 /**