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OpenCloudOS-Kernel
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Merge branch 'pm-opp' 

* pm-opp:
  PM / OPP: Return suspend_opp only if it is enabled
  PM / OPP: add dev_pm_opp_get_suspend_opp() helper
This commit is contained in:
Rafael J. Wysocki 2015-09-11 15:37:17 +02:00
parent ae98207309 1b2b90cbea
commit 7c976664d5
2 changed files with 34 additions and 0 deletions
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28
drivers/base/power/opp.c
View File

@ -340,6 +340,34 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
/**
* dev_pm_opp_get_suspend_opp() - Get suspend opp
* @dev: device for which we do this operation
*
* Return: This function returns pointer to the suspend opp if it is
* defined and available, otherwise it returns NULL.
*
* Locking: This function must be called under rcu_read_lock(). opp is a rcu
* protected pointer. The reason for the same is that the opp pointer which is
* returned will remain valid for use with opp_get_{voltage, freq} only while
* under the locked area. The pointer returned must be used prior to unlocking
* with rcu_read_unlock() to maintain the integrity of the pointer.
*/
struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
{
struct device_opp *dev_opp;
opp_rcu_lockdep_assert();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp) || !dev_opp->suspend_opp ||
!dev_opp->suspend_opp->available)
return NULL;
return dev_opp->suspend_opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp);
/**
* dev_pm_opp_get_opp_count() - Get number of opps available in the opp list
* @dev: device for which we do this operation

6
include/linux/pm_opp.h
View File

@ -34,6 +34,7 @@ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
int dev_pm_opp_get_opp_count(struct device *dev);
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq,
@ -80,6 +81,11 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
return 0;
}
static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
{
return NULL;
}
static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq, bool available)
{