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PM / OPP: add dev_pm_opp_get_suspend_opp() helper

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Add dev_pm_opp_get_suspend_opp() helper to obtain suspend opp.

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2015-09-08 18:41:01 +02:00 committed by Rafael J. Wysocki
parent 50a3cb04a5
commit 4eafbd15b6
2 changed files with 36 additions and 0 deletions
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30
drivers/base/power/opp.c
View File

@ -340,6 +340,36 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
} }
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); 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, 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;
struct dev_pm_opp *opp;
opp_rcu_lockdep_assert();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp))
opp = NULL;
else
opp = dev_opp->suspend_opp;
return 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_pm_opp_get_opp_count() - Get number of opps available in the opp list
* @dev: device for which we do this operation * @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); int dev_pm_opp_get_opp_count(struct device *dev);
unsigned long dev_pm_opp_get_max_clock_latency(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, struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq, unsigned long freq,
@ -80,6 +81,11 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
return 0; 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, static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq, bool available) unsigned long freq, bool available)
{ {