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PM / devfreq: cache the last call to get_dev_status()

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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>
This commit is contained in:
Javi Merino 2015-08-14 18:56:56 +01:00 • committed by MyungJoo Ham
parent 9348da2f1c
commit 08e75e754a
2 changed files with 33 additions and 15 deletions
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15
include/linux/devfreq.h
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@ -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__ */