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PM / devfreq: Cache OPP table reference in devfreq

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The OPP table can be used often in devfreq. Trying to get it each time can
be expensive, so cache it in the devfreq struct.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
[ Viresh: Added a blank line ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Saravana Kannan 2021-02-04 16:14:23 +08:00 committed by Viresh Kumar
parent 7d8658ef65
commit 26f9c7cc42
2 changed files with 9 additions and 0 deletions
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7
drivers/devfreq/devfreq.c
View File

@ -757,6 +757,9 @@ static void devfreq_dev_release(struct device *dev)
if (devfreq->profile->exit)
devfreq->profile->exit(devfreq->dev.parent);
if (devfreq->opp_table)
dev_pm_opp_put_opp_table(devfreq->opp_table);
mutex_destroy(&devfreq->lock);
kfree(devfreq);
}
@ -844,6 +847,10 @@ struct devfreq *devfreq_add_device(struct device *dev,
}
devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev);
devfreq->opp_table = dev_pm_opp_get_opp_table(dev);
if (IS_ERR(devfreq->opp_table))
devfreq->opp_table = NULL;
atomic_set(&devfreq->suspend_count, 0);
dev_set_name(&devfreq->dev, "%s", dev_name(dev));

2
include/linux/devfreq.h
View File

@ -137,6 +137,7 @@ struct devfreq_stats {
* using devfreq.
* @profile: device-specific devfreq profile
* @governor: method how to choose frequency based on the usage.
* @opp_table: Reference to OPP table of dev.parent, if one exists.
* @nb: notifier block used to notify devfreq object that it should
* reevaluate operable frequencies. Devfreq users may use
* devfreq.nb to the corresponding register notifier call chain.
@ -173,6 +174,7 @@ struct devfreq {
struct device dev;
struct devfreq_dev_profile *profile;
const struct devfreq_governor *governor;
struct opp_table *opp_table;
struct notifier_block nb;
struct delayed_work work;