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-rw-r--r--drivers/base/power/domain.c68
-rw-r--r--include/linux/pm_domain.h2
2 files changed, 58 insertions, 12 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 94afaa2686a6..3c9451b10427 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -56,6 +56,16 @@ static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
return GENPD_DEV_CALLBACK(genpd, int, start, dev);
}
+static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
+{
+ return GENPD_DEV_CALLBACK(genpd, int, save_state, dev);
+}
+
+static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev)
+{
+ return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev);
+}
+
static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
{
bool ret = false;
@@ -217,7 +227,6 @@ static int __pm_genpd_save_device(struct pm_domain_data *pdd,
{
struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
struct device *dev = pdd->dev;
- struct device_driver *drv = dev->driver;
int ret = 0;
if (gpd_data->need_restore)
@@ -225,11 +234,9 @@ static int __pm_genpd_save_device(struct pm_domain_data *pdd,
mutex_unlock(&genpd->lock);
- if (drv && drv->pm && drv->pm->runtime_suspend) {
- genpd_start_dev(genpd, dev);
- ret = drv->pm->runtime_suspend(dev);
- genpd_stop_dev(genpd, dev);
- }
+ genpd_start_dev(genpd, dev);
+ ret = genpd_save_dev(genpd, dev);
+ genpd_stop_dev(genpd, dev);
mutex_lock(&genpd->lock);
@@ -250,18 +257,15 @@ static void __pm_genpd_restore_device(struct pm_domain_data *pdd,
{
struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
struct device *dev = pdd->dev;
- struct device_driver *drv = dev->driver;
if (!gpd_data->need_restore)
return;
mutex_unlock(&genpd->lock);
- if (drv && drv->pm && drv->pm->runtime_resume) {
- genpd_start_dev(genpd, dev);
- drv->pm->runtime_resume(dev);
- genpd_stop_dev(genpd, dev);
- }
+ genpd_start_dev(genpd, dev);
+ genpd_restore_dev(genpd, dev);
+ genpd_stop_dev(genpd, dev);
mutex_lock(&genpd->lock);
@@ -1358,6 +1362,44 @@ int pm_genpd_remove_callbacks(struct device *dev)
EXPORT_SYMBOL_GPL(pm_genpd_remove_callbacks);
/**
+ * pm_genpd_default_save_state - Default "save device state" for PM domians.
+ * @dev: Device to handle.
+ */
+static int pm_genpd_default_save_state(struct device *dev)
+{
+ int (*cb)(struct device *__dev);
+ struct device_driver *drv = dev->driver;
+
+ cb = dev_gpd_data(dev)->ops.save_state;
+ if (cb)
+ return cb(dev);
+
+ if (drv && drv->pm && drv->pm->runtime_suspend)
+ return drv->pm->runtime_suspend(dev);
+
+ return 0;
+}
+
+/**
+ * pm_genpd_default_restore_state - Default PM domians "restore device state".
+ * @dev: Device to handle.
+ */
+static int pm_genpd_default_restore_state(struct device *dev)
+{
+ int (*cb)(struct device *__dev);
+ struct device_driver *drv = dev->driver;
+
+ cb = dev_gpd_data(dev)->ops.restore_state;
+ if (cb)
+ return cb(dev);
+
+ if (drv && drv->pm && drv->pm->runtime_resume)
+ return drv->pm->runtime_resume(dev);
+
+ return 0;
+}
+
+/**
* pm_genpd_init - Initialize a generic I/O PM domain object.
* @genpd: PM domain object to initialize.
* @gov: PM domain governor to associate with the domain (may be NULL).
@@ -1400,6 +1442,8 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
genpd->domain.ops.restore = pm_genpd_restore;
genpd->domain.ops.complete = pm_genpd_complete;
+ genpd->dev_ops.save_state = pm_genpd_default_save_state;
+ genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
mutex_lock(&gpd_list_lock);
list_add(&genpd->gpd_list_node, &gpd_list);
mutex_unlock(&gpd_list_lock);
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 8949d2d202ae..731080dad250 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -26,6 +26,8 @@ struct dev_power_governor {
struct gpd_dev_ops {
int (*start)(struct device *dev);
int (*stop)(struct device *dev);
+ int (*save_state)(struct device *dev);
+ int (*restore_state)(struct device *dev);
bool (*active_wakeup)(struct device *dev);
};