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Commit 5125bbf3 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / Domains: Introduce function to power off all unused PM domains 



Add a new function pm_genpd_poweroff_unused() queuing up the
execution of pm_genpd_poweroff() for every initialized generic PM
domain.  Calling it will cause every generic PM domain without
devices in use to be powered off.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
parent 56375fd4

drivers/base/power/domain.c

+21 −0
Original line number Diff line number Diff line
@@ -16,6 +16,9 @@ 
#include <linux/sched.h>

#include <linux/suspend.h>



static LIST_HEAD(gpd_list);

static DEFINE_MUTEX(gpd_list_lock);



#ifdef CONFIG_PM



static struct generic_pm_domain *dev_to_genpd(struct device *dev)
@@ -1241,4 +1244,22 @@ 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;

	mutex_lock(&gpd_list_lock);

	list_add(&genpd->gpd_list_node, &gpd_list);

	mutex_unlock(&gpd_list_lock);

}



/**

 * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.

 */

void pm_genpd_poweroff_unused(void)

{

	struct generic_pm_domain *genpd;



	mutex_lock(&gpd_list_lock);



	list_for_each_entry(genpd, &gpd_list, gpd_list_node)

		genpd_queue_power_off_work(genpd);



	mutex_unlock(&gpd_list_lock);

}

include/linux/pm_domain.h

+3 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ struct dev_power_governor { 


struct generic_pm_domain {

	struct dev_pm_domain domain;	/* PM domain operations */

	struct list_head gpd_list_node;	/* Node in the global PM domains list */

	struct list_head sd_node;	/* Node in the parent's subdomain list */

	struct generic_pm_domain *parent;	/* Parent PM domain */

	struct list_head sd_list;	/* List of dubdomains */
@@ -71,6 +72,7 @@ extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 
extern void pm_genpd_init(struct generic_pm_domain *genpd,

			  struct dev_power_governor *gov, bool is_off);

extern int pm_genpd_poweron(struct generic_pm_domain *genpd);

extern void pm_genpd_poweroff_unused(void);

#else

static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,

				      struct device *dev)
@@ -98,6 +100,7 @@ static inline int pm_genpd_poweron(struct generic_pm_domain *genpd) 
{

	return -ENOSYS;

}

static inline void pm_genpd_poweroff_unused(void) {}

#endif



#endif /* _LINUX_PM_DOMAIN_H */