PM / devfreq: Cache OPP table reference in devfreq

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>

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 6aa10de792b33060cd9840c471d62c8f9e87737f..cefe84a10824ff0356e4492192144a6d17484820 100644 (file)
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -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));

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index b6d3bae1c74d8e43dcfb674b2eb3402367ba1eaa..26ea0850be9bb0a4aecd2d6c25e1f269e7840ee8 100644 (file)
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -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;