mmc: core: Add bus_ops for runtime pm callbacks

SDIO is the only protocol that uses runtime pm for the card device
right now. To provide the option for sd and mmc to use runtime pm as
well the bus_ops callback are extended with two new functions. One for
runtime_suspend and one for runtime_resume.

This patch will also implement the callbacks for SDIO to make sure
existing functionality is maintained. It also prepares to move
away from using the mmc_power_restore_host API, since it is not
needed when using runtime PM.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 444668c210b2..1fbbd1bc55ec 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -1059,11 +1059,27 @@ out:
         return ret;
 }
 
+static int mmc_sdio_runtime_suspend(struct mmc_host *host)
+{
+        /* No references to the card, cut the power to it. */
+        mmc_power_off(host);
+        return 0;
+}
+
+static int mmc_sdio_runtime_resume(struct mmc_host *host)
+{
+        /* Restore power and re-initialize. */
+        mmc_power_up(host);
+        return mmc_sdio_power_restore(host);
+}
+
 static const struct mmc_bus_ops mmc_sdio_ops = {
         .remove = mmc_sdio_remove,
         .detect = mmc_sdio_detect,
         .suspend = mmc_sdio_suspend,
         .resume = mmc_sdio_resume,
+        .runtime_suspend = mmc_sdio_runtime_suspend,
+        .runtime_resume = mmc_sdio_runtime_resume,
         .power_restore = mmc_sdio_power_restore,
         .alive = mmc_sdio_alive,
 };