[PATCH 4.9 053/153] PM / devfreq: Fix wrong trans_stat of passive devfreq device

Greg Kroah-Hartman
2017-03-10T11:23:26Z

From: Chanwoo Choi <cw00.choi@samsung.com>

commit 30582c25a4b4e0a5e456a309fde79b845e9473b2 upstream.

Until now, the trans_stat information of passive devfreq is not updated.
This patch updates the trans_stat information after setting the target
frequency of passive devfreq device.

Fixes: 996133119f57 ("PM / devfreq: Add new passive governor")
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/devfreq/devfreq.c | 3 ++-
drivers/devfreq/governor.h | 2 ++
drivers/devfreq/governor_passive.c | 5 +++++
3 files changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -130,7 +130,7 @@ static void devfreq_set_freq_table(struc
* @devfreq: the devfreq instance
* @freq: the update target frequency
*/
-static int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
+int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
{
int lev, prev_lev, ret = 0;
unsigned long cur_time;
@@ -166,6 +166,7 @@ out:
devfreq->last_stat_updated = cur_time;
return ret;
}
+EXPORT_SYMBOL(devfreq_update_status);

/**
* find_devfreq_governor() - find devfreq governor from name
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -38,4 +38,6 @@ extern void devfreq_interval_update(stru
extern int devfreq_add_governor(struct devfreq_governor *governor);
extern int devfreq_remove_governor(struct devfreq_governor *governor);

+extern int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
+
#endif /* _GOVERNOR_H */
--- a/drivers/devfreq/governor_passive.c
+++ b/drivers/devfreq/governor_passive.c
@@ -112,6 +112,11 @@ static int update_devfreq_passive(struct
if (ret < 0)
goto out;

+ if (devfreq->profile->freq_table
+ && (devfreq_update_status(devfreq, freq)))
+ dev_err(&devfreq->dev,
+ "Couldn't update frequency transition information.\n");
+
devfreq->previous_freq = freq;