From 5125bbf3880755419eff68672623cde49c4f31e8 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 13 Jul 2011 12:31:52 +0200 Subject: 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 Acked-by: Magnus Damm --- drivers/base/power/domain.c | 21 +++++++++++++++++++++ include/linux/pm_domain.h | 3 +++ 2 files changed, 24 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index c3e4e2934e16..c2c537de22b6 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -16,6 +16,9 @@ #include #include +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); } diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index feb80af4cc1b..3e4f3d308f5e 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -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 */ -- cgit v1.2.3