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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: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>
This commit is contained in:
Rafael J. Wysocki 2011-07-13 12:31:52 +02:00
parent 56375fd420
commit 5125bbf388
2 changed files with 24 additions and 0 deletions
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21
drivers/base/power/domain.c
View File

@ -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);
}

3
include/linux/pm_domain.h
View File

@ -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 */