Commit 4acbfb6c authored by Peng Fan's avatar Peng Fan Committed by Ulf Hansson
Browse files

PM: wakeup: Add out-of-band system wakeup support for devices 



Some devices can wake up the system from suspend even when their power
domains are turned off. This is possible because their system-wakeup logic
resides in an always-on power domain - indicating that they support
out-of-band system wakeup.

Currently, PM domain core doesn't power off such devices if they are marked
as system wakeup sources. To better represent devices with out-of-band
wakeup capability, this patch introduces a new flag out_band_wakeup in
'struct dev_pm_info'.

Two helper APIs are added:
 - device_set_out_band_wakeup() - to mark a device as having out-of-band
   wakeup capability.
 - device_out_band_wakeup() - to query the flag.

Allow the PM core and drivers to distinguish between regular and
out-of-band wakeup sources, enable more accurate power management decision.

Signed-off-by: default avatarPeng Fan <peng.fan@nxp.com>
Reviewed-by: default avatarDhruva Gole <d-gole@ti.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 35cfef3c

drivers/base/power/main.c

+1 −0
Original line number Diff line number Diff line
@@ -2126,6 +2126,7 @@ static int device_prepare(struct device *dev, pm_message_t state) 
	device_lock(dev);



	dev->power.wakeup_path = false;

	dev->power.out_band_wakeup = false;



	if (dev->power.no_pm_callbacks)

		goto unlock;

include/linux/pm.h

+1 −0
Original line number Diff line number Diff line
@@ -684,6 +684,7 @@ struct dev_pm_info { 
	bool			smart_suspend:1;	/* Owned by the PM core */

	bool			must_resume:1;		/* Owned by the PM core */

	bool			may_skip_resume:1;	/* Set by subsystems */

	bool			out_band_wakeup:1;

	bool			strict_midlayer:1;

#else

	bool			should_wakeup:1;

include/linux/pm_wakeup.h

+17 −0
Original line number Diff line number Diff line
@@ -94,6 +94,16 @@ static inline void device_set_wakeup_path(struct device *dev) 
	dev->power.wakeup_path = true;

}



static inline void device_set_out_band_wakeup(struct device *dev)

{

	dev->power.out_band_wakeup = true;

}



static inline bool device_out_band_wakeup(struct device *dev)

{

	return dev->power.out_band_wakeup;

}



/* drivers/base/power/wakeup.c */

extern struct wakeup_source *wakeup_source_register(struct device *dev,

						    const char *name);
@@ -162,6 +172,13 @@ static inline bool device_wakeup_path(struct device *dev) 


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



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



static inline bool device_out_band_wakeup(struct device *dev)

{

	return false;

}



static inline void __pm_stay_awake(struct wakeup_source *ws) {}



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