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PM Sleep: Do not extend wakeup paths to devices with ignore_children set 

Commit 4ca46ff3e0 (PM / Sleep: Mark
devices involved in wakeup signaling during suspend) introduced
the power.wakeup_path field in struct dev_pm_info to mark devices
whose children are enabled to wake up the system from sleep states,
so that power domains containing the parents that provide their
children with wakeup power and/or relay their wakeup signals are not
turned off.  Unfortunately, that introduced a PM regression on SH7372
whose power consumption in the system "memory sleep" state increased
as a result of it, because it prevented the power domain containing
the I2C controller from being turned off when some children of that
controller were enabled to wake up the system, although the
controller was not necessary for them to signal wakeup.

To fix this issue use the observation that devices whose
power.ignore_children flag is set for runtime PM should be treated
analogously during system suspend.  Namely, they shouldn't be
included in wakeup paths going through their children.  Since the
SH7372 I2C controller's power.ignore_children flag is set, doing so
will restore the previous behavior of that SOC.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rafael J. Wysocki 2011-11-17 21:39:33 +01:00
parent af8db1508f
commit 8b258cc8ac
4 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/base/power/main.c
View File

@ -920,7 +920,8 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
End:
if (!error) {
dev->power.is_suspended = true;
if (dev->power.wakeup_path && dev->parent)
if (dev->power.wakeup_path
&& dev->parent && !dev->parent->power.ignore_children)
dev->parent->power.wakeup_path = true;
}

5
include/linux/device.h
View File

@ -682,6 +682,11 @@ static inline bool device_async_suspend_enabled(struct device *dev)
return !!dev->power.async_suspend;
}
static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
{
dev->power.ignore_children = enable;
}
static inline void device_lock(struct device *dev)
{
mutex_lock(&dev->mutex);

2
include/linux/pm.h
View File

@ -447,6 +447,7 @@ struct dev_pm_info {
unsigned int async_suspend:1;
bool is_prepared:1; /* Owned by the PM core */
bool is_suspended:1; /* Ditto */
bool ignore_children:1;
spinlock_t lock;
#ifdef CONFIG_PM_SLEEP
struct list_head entry;
@ -464,7 +465,6 @@ struct dev_pm_info {
atomic_t usage_count;
atomic_t child_count;
unsigned int disable_depth:3;
unsigned int ignore_children:1;
unsigned int idle_notification:1;
unsigned int request_pending:1;
unsigned int deferred_resume:1;

6
include/linux/pm_runtime.h
View File

@ -52,11 +52,6 @@ static inline bool pm_children_suspended(struct device *dev)
|| !atomic_read(&dev->power.child_count);
}
static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
{
dev->power.ignore_children = enable;
}
static inline void pm_runtime_get_noresume(struct device *dev)
{
atomic_inc(&dev->power.usage_count);
@ -130,7 +125,6 @@ static inline void pm_runtime_allow(struct device *dev) {}
static inline void pm_runtime_forbid(struct device *dev) {}
static inline bool pm_children_suspended(struct device *dev) { return false; }
static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
static inline void pm_runtime_get_noresume(struct device *dev) {}
static inline void pm_runtime_put_noidle(struct device *dev) {}
static inline bool device_run_wake(struct device *dev) { return false; }