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authorJavi Merino <javi.merino@arm.com>2015-08-14 18:56:56 +0100
committerMyungJoo Ham <myungjoo.ham@samsung.com>2015-09-11 14:23:28 +0900
commit08e75e754a6d9838e490b74551d19fc04d0fd6f9 (patch)
tree71344662250f9bd22389a86e886a1aa6b67c7fed /include/linux/devfreq.h
parent9348da2f1c2ca8e064d4907cdc5b3a19477df933 (diff)
PM / devfreq: cache the last call to get_dev_status()
The return value of get_dev_status() can be reused. Cache it so that other parts of the kernel can reuse it instead of having to call the same function again. Cc: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'include/linux/devfreq.h')
-rw-r--r--include/linux/devfreq.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index ce447f0f1bad..70a1c60ddda4 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -161,6 +161,7 @@ struct devfreq {
struct delayed_work work;
unsigned long previous_freq;
+ struct devfreq_dev_status last_status;
void *data; /* private data for governors */
@@ -204,6 +205,15 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev,
extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
struct devfreq *devfreq);
+/**
+ * devfreq_update_stats() - update the last_status pointer in struct devfreq
+ * @df: the devfreq instance whose status needs updating
+ */
+static inline int devfreq_update_stats(struct devfreq *df)
+{
+ return df->profile->get_dev_status(df->dev.parent, &df->last_status);
+}
+
#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
/**
* struct devfreq_simple_ondemand_data - void *data fed to struct devfreq
@@ -289,6 +299,11 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
struct devfreq *devfreq)
{
}
+
+static inline int devfreq_update_stats(struct devfreq *df)
+{
+ return -EINVAL;
+}
#endif /* CONFIG_PM_DEVFREQ */
#endif /* __LINUX_DEVFREQ_H__ */