Add MMC runtime PM handlers, which call mmc_power_save_host
and mmc_power_restore_host in response to runtime_suspend and
runtime_resume events.
Runtime PM is still disabled by default, so this patch alone
has no immediate effect.
Signed-off-by: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
---
drivers/mmc/core/bus.c | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index da3c01b..af8dc6a 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -14,6 +14,7 @@
#include <linux/device.h>
#include <linux/err.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
@@ -141,6 +142,41 @@ static int mmc_bus_resume(struct device *dev)
return ret;
}
+#ifdef CONFIG_PM_RUNTIME
+
+static int mmc_runtime_suspend(struct device *dev)
+{
+ struct mmc_card *card = mmc_dev_to_card(dev);
+
+ return mmc_power_save_host(card->host);
+}
+
+static int mmc_runtime_resume(struct device *dev)
+{
+ struct mmc_card *card = mmc_dev_to_card(dev);
+
+ return mmc_power_restore_host(card->host);
+}
+
+static int mmc_runtime_idle(struct device *dev)
+{
+ return pm_runtime_suspend(dev);
+}
+
+static const struct dev_pm_ops mmc_bus_pm_ops = {
+ .runtime_suspend = mmc_runtime_suspend,
+ .runtime_resume = mmc_runtime_resume,
+ .runtime_idle = mmc_runtime_idle,
+};
+
+#define MMC_PM_OPS_PTR (&mmc_bus_pm_ops)
+
+#else /* !CONFIG_PM_RUNTIME */
+
+#define MMC_PM_OPS_PTR NULL
+
+#endif /* !CONFIG_PM_RUNTIME */
+
static struct bus_type mmc_bus_type = {
.name = "mmc",
.dev_attrs = mmc_dev_attrs,
@@ -150,6 +186,7 @@ static struct bus_type mmc_bus_type = {
.remove = mmc_bus_remove,
.suspend = mmc_bus_suspend,
.resume = mmc_bus_resume,
+ .pm = MMC_PM_OPS_PTR,
};
int mmc_register_bus(void)
--
1.7.0.4
--
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