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Subject[PATCH v4 1/4] PM / OPP: add dev_pm_opp_get_suspend_opp() helper
Date
Add dev_pm_opp_get_suspend_opp() helper to obtain suspend opp.

Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Thomas Abraham <thomas.ab@samsung.com>
Cc: Javier Martinez Canillas <javier@osg.samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
drivers/base/power/opp.c | 30 ++++++++++++++++++++++++++++++
include/linux/pm_opp.h | 6 ++++++
2 files changed, 36 insertions(+)

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index eb25449..3d948ea 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
*
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index cab7ba5..e817722 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -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)
{
--
1.9.1


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