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authorRafael J. Wysocki <rjw@sisk.pl>2012-08-06 01:39:57 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-09-04 01:36:01 +0200
commit77f827de07432a74821cf0f831d699544b2d474f (patch)
treec7abd8f50c25b43ff32ba5a4200cf5e4fcd31f89 /drivers/base
parent802d8b49a7705298b62ac35a59b867f1288caaf3 (diff)
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: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c57
1 files changed, 51 insertions, 6 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 55c39f5b7a5..515c8ecf01c 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -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