From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Add a new helper routine, pm_runtime_enabled_and_suspended(), to
allow subsystems (or PM domains) to check the runtime PM status of
devices during system suspend (possibly to avoid resuming those
devices upfront at that time).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
drivers/base/power/runtime.c | 27 +++++++++++++++++++++++++++
include/linux/pm_runtime.h | 2 ++
2 files changed, 29 insertions(+)
Index: linux-pm/include/linux/pm_runtime.h
===================================================================
--- linux-pm.orig/include/linux/pm_runtime.h
+++ linux-pm/include/linux/pm_runtime.h
@@ -57,6 +57,7 @@ extern unsigned long pm_runtime_autosusp
extern void pm_runtime_update_max_time_suspended(struct device *dev,
s64 delta_ns);
extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
+extern bool pm_runtime_enabled_and_suspended(struct device *dev);
extern void pm_set_direct_resume(struct device *dev, bool val);
static inline bool pm_children_suspended(struct device *dev)
@@ -175,6 +176,7 @@ static inline unsigned long pm_runtime_a
struct device *dev) { return 0; }
static inline void pm_runtime_set_memalloc_noio(struct device *dev,
bool enable){}
+static inline bool pm_runtime_enabled_and_suspended(struct device *dev) { return false; }
static inline void __set_direct_resume(struct device *dev, bool val) {}
static inline void pm_set_direct_resume(struct device *dev, bool val) {}
static inline bool pm_direct_resume_is_set(struct device *dev) { return false; }
Index: linux-pm/drivers/base/power/runtime.c
===================================================================
--- linux-pm.orig/drivers/base/power/runtime.c
+++ linux-pm/drivers/base/power/runtime.c
@@ -1196,6 +1196,33 @@ void pm_runtime_enable(struct device *de
EXPORT_SYMBOL_GPL(pm_runtime_enable);
/**
+ * pm_runtime_enabled_and_suspended - Check runtime PM status of a device.
+ * @dev: Device to handle.
+ *
+ * This routine is to be executed during system suspend only, after
+ * device_prepare() has been executed for @dev.
+ *
+ * Return false if runtime PM is disabled for the device. Otherwise, wait
+ * for pending transitions to complete and check the runtime PM status of the
+ * device after that. Return true if it is RPM_SUSPENDED.
+ */
+bool pm_runtime_enabled_and_suspended(struct device *dev)
+{
+ unsigned long flags;
+ bool ret;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+ if (dev->power.disable_depth) {
+ ret = false;
+ } else {
+ __pm_runtime_barrier(dev);
+ ret = pm_runtime_status_suspended(dev);
+ }
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+ return ret;
+}
+
+/**
* pm_runtime_forbid - Block runtime PM of a device.
* @dev: Device to handle.
*
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
