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>

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 3094ea3ed72264b846e0241055a59d7c41684d7e..b43e1ab5cb5cf3de671796744638508c5e7ea2d3 100644 (file)
--- 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[] = {