Commit 77f827de authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / Domains: Add power off/on function for system core suspend stage 



Introduce function pm_genpd_syscore_switch() and two wrappers around
it, pm_genpd_syscore_poweroff() and pm_genpd_syscore_poweron(),
allowing the callers to let the generic PM domains framework know
that the given device is not necessary any more and its PM domain
can be turned off (the former) or that the given device will be
required immediately, so its PM domain has to be turned on (the
latter) during the system core (syscore) stage of system suspend
(or hibernation) and resume.

These functions will be used for handling devices registered as
clock sources and clock event devices that belong to PM domains.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 802d8b49

drivers/base/power/domain.c

+51 −6
Original line number Diff line number Diff line
@@ -697,6 +697,24 @@ static inline void genpd_power_off_work_fn(struct work_struct *work) {} 


#ifdef CONFIG_PM_SLEEP



/**

 * pm_genpd_present - Check if the given PM domain has been initialized.

 * @genpd: PM domain to check.

 */

static bool pm_genpd_present(struct generic_pm_domain *genpd)

{

	struct generic_pm_domain *gpd;



	if (IS_ERR_OR_NULL(genpd))

		return false;



	list_for_each_entry(gpd, &gpd_list, gpd_list_node)

		if (gpd == genpd)

			return true;



	return false;

}



static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,

				    struct device *dev)

{
@@ -750,9 +768,10 @@ static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) 
 * Check if the given PM domain can be powered off (during system suspend or

 * hibernation) and do that if so.  Also, in that case propagate to its masters.

 *

 * This function is only called in "noirq" stages of system power transitions,

 * so it need not acquire locks (all of the "noirq" callbacks are executed

 * sequentially, so it is guaranteed that it will never run twice in parallel).

 * This function is only called in "noirq" and "syscore" stages of system power

 * transitions, so it need not acquire locks (all of the "noirq" callbacks are

 * executed sequentially, so it is guaranteed that it will never run twice in

 * parallel).

 */

static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)

{
@@ -780,9 +799,10 @@ static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) 
 * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.

 * @genpd: PM domain to power on.

 *

 * This function is only called in "noirq" stage of system power transitions, so

 * it need not acquire locks (all of the "noirq" callbacks are executed

 * sequentially, so it is guaranteed that it will never run twice in parallel).

 * This function is only called in "noirq" and "syscore" stages of system power

 * transitions, so it need not acquire locks (all of the "noirq" callbacks are

 * executed sequentially, so it is guaranteed that it will never run twice in

 * parallel).

 */

static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd)

{
@@ -1272,6 +1292,31 @@ static void pm_genpd_complete(struct device *dev) 
	}

}



/**

 * pm_genpd_syscore_switch - Switch power during system core suspend or resume.

 * @dev: Device that normally is marked as "always on" to switch power for.

 *

 * This routine may only be called during the system core (syscore) suspend or

 * resume phase for devices whose "always on" flags are set.

 */

void pm_genpd_syscore_switch(struct device *dev, bool suspend)

{

	struct generic_pm_domain *genpd;



	genpd = dev_to_genpd(dev);

	if (!pm_genpd_present(genpd))

		return;



	if (suspend) {

		genpd->suspended_count++;

		pm_genpd_sync_poweroff(genpd);

	} else {

		pm_genpd_sync_poweron(genpd);

		genpd->suspended_count--;

	}

}

EXPORT_SYMBOL_GPL(pm_genpd_syscore_switch);



#else



#define pm_genpd_prepare		NULL

include/linux/pm_domain.h

+16 −0
Original line number Diff line number Diff line
@@ -258,4 +258,20 @@ static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {} 
static inline void pm_genpd_poweroff_unused(void) {}

#endif



#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP

extern void pm_genpd_syscore_switch(struct device *dev, bool suspend);

#else

static inline void pm_genpd_syscore_switch(struct device *dev, bool suspend) {}

#endif



static inline void pm_genpd_syscore_poweroff(struct device *dev)

{

	pm_genpd_syscore_switch(dev, true);

}



static inline void pm_genpd_syscore_poweron(struct device *dev)

{

	pm_genpd_syscore_switch(dev, false);

}



#endif /* _LINUX_PM_DOMAIN_H */

kernel/power/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -263,6 +263,10 @@ config PM_GENERIC_DOMAINS 
	bool

	depends on PM



config PM_GENERIC_DOMAINS_SLEEP

	def_bool y

	depends on PM_SLEEP && PM_GENERIC_DOMAINS



config PM_GENERIC_DOMAINS_RUNTIME

	def_bool y

	depends on PM_RUNTIME && PM_GENERIC_DOMAINS

CRA Git | Maintained and supported by SUSTech CRA and CCSE