ARM: 7622/1: mmc: mmci: Gate the clock in runtime suspend to save power

The amba bus is already performing same actions but for the apb_pclk.
So here we just make sure the clock to card is gated as well to save
more power. At runtime resume we will thus restore the clock again.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Kevin Liu <kliu5@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 3094ea3ed722..b43e1ab5cb5c 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1614,8 +1614,37 @@ static int mmci_resume(struct device *dev)
 }
 #endif
 
+#ifdef CONFIG_PM_RUNTIME
+static int mmci_runtime_suspend(struct device *dev)
+{
+        struct amba_device *adev = to_amba_device(dev);
+        struct mmc_host *mmc = amba_get_drvdata(adev);
+
+        if (mmc) {
+                struct mmci_host *host = mmc_priv(mmc);
+                clk_disable_unprepare(host->clk);
+        }
+
+        return 0;
+}
+
+static int mmci_runtime_resume(struct device *dev)
+{
+        struct amba_device *adev = to_amba_device(dev);
+        struct mmc_host *mmc = amba_get_drvdata(adev);
+
+        if (mmc) {
+                struct mmci_host *host = mmc_priv(mmc);
+                clk_prepare_enable(host->clk);
+        }
+
+        return 0;
+}
+#endif
+
 static const struct dev_pm_ops mmci_dev_pm_ops = {
         SET_SYSTEM_SLEEP_PM_OPS(mmci_suspend, mmci_resume)
+        SET_RUNTIME_PM_OPS(mmci_runtime_suspend, mmci_runtime_resume, NULL)
 };
 
 static struct amba_id mmci_ids[] = {