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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-09-11 13:37:17 (GMT)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-09-11 13:37:17 (GMT)
commit7c976664d537bca19c9bf892b4d9e5ab7ecea927 (patch)
treedf910dfff1eef04c3d5e9dc585579ae4e96c42ba /drivers
parentae982073095a44f004d7ffb9f271077abef9dbcf (diff)
parent1b2b90cbea00670221f062814dc8bcecb3af7b90 (diff)
downloadlinux-7c976664d537bca19c9bf892b4d9e5ab7ecea927.tar.xz
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
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/power/opp.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index eb25449..28cd75c 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -341,6 +341,34 @@ 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
*