diff options
| author | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2015-09-08 18:41:01 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-09-09 02:20:39 +0200 |
| commit | 4eafbd15b6c84cd3f6c76022c8a6c27f7cc076e1 (patch) | |
| tree | 830405d520490c0ad7d7620551910fbb95508459 /drivers/base | |
| parent | 50a3cb04a5f9cd5323a76db9ee409a7f3004259a (diff) | |
PM / OPP: add dev_pm_opp_get_suspend_opp() helper
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/opp.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c index bb703b5ebaff..3df62dbcec3a 100644 --- a/drivers/base/power/opp.c +++ b/drivers/base/power/opp.c @@ -341,6 +341,36 @@ 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, 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: device for which we do this operation * |