Commit 758cc55c authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM: runtime: Introduce pm_runtime_blocked() 



Introduce a new helper function called pm_runtime_blocked()
for checking the power.last_status value indicating whether or not
enabling runtime PM for the given device has been blocked (which
happens in the "prepare" phase of system-wide suspend if runtime
PM is disabled for the given device at that point).

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Link: https://patch.msgid.link/4632087.LvFx2qVVIh@rjwysocki.net
parent 3e5eee14

drivers/base/power/runtime.c

+17 −0
Original line number Diff line number Diff line
@@ -1555,6 +1555,23 @@ void pm_runtime_enable(struct device *dev) 
}

EXPORT_SYMBOL_GPL(pm_runtime_enable);



bool pm_runtime_blocked(struct device *dev)

{

	bool ret;



	/*

	 * dev->power.last_status is a bit field, so in case it is updated via

	 * RMW, read it under the spin lock.

	 */

	spin_lock_irq(&dev->power.lock);



	ret = dev->power.last_status == RPM_BLOCKED;



	spin_unlock_irq(&dev->power.lock);



	return ret;

}



static void pm_runtime_disable_action(void *data)

{

	pm_runtime_dont_use_autosuspend(data);

include/linux/pm_runtime.h

+2 −0
Original line number Diff line number Diff line
@@ -81,6 +81,7 @@ extern void pm_runtime_block_if_disabled(struct device *dev); 
extern void pm_runtime_unblock(struct device *dev);

extern void pm_runtime_enable(struct device *dev);

extern void __pm_runtime_disable(struct device *dev, bool check_resume);

extern bool pm_runtime_blocked(struct device *dev);

extern void pm_runtime_allow(struct device *dev);

extern void pm_runtime_forbid(struct device *dev);

extern void pm_runtime_no_callbacks(struct device *dev);
@@ -277,6 +278,7 @@ static inline void pm_runtime_block_if_disabled(struct device *dev) {} 
static inline void pm_runtime_unblock(struct device *dev) {}

static inline void pm_runtime_enable(struct device *dev) {}

static inline void __pm_runtime_disable(struct device *dev, bool c) {}

static inline bool pm_runtime_blocked(struct device *dev) { return true; }

static inline void pm_runtime_allow(struct device *dev) {}

static inline void pm_runtime_forbid(struct device *dev) {}