PM / devfreq: account suspend/resume for stats

devfreq stats is not taking device suspend and resume into
account. Fix it.

Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 3b367973a802..abfa14dd8b4c 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -271,6 +271,7 @@ void devfreq_monitor_suspend(struct devfreq *devfreq)
                 return;
         }
 
+        devfreq_update_status(devfreq, devfreq->previous_freq);
         devfreq->stop_polling = true;
         mutex_unlock(&devfreq->lock);
         cancel_delayed_work_sync(&devfreq->work);
@@ -287,6 +288,8 @@ EXPORT_SYMBOL(devfreq_monitor_suspend);
  */
 void devfreq_monitor_resume(struct devfreq *devfreq)
 {
+        unsigned long freq;
+
         mutex_lock(&devfreq->lock);
         if (!devfreq->stop_polling)
                 goto out;
@@ -295,8 +298,14 @@ void devfreq_monitor_resume(struct devfreq *devfreq)
                         devfreq->profile->polling_ms)
                 queue_delayed_work(devfreq_wq, &devfreq->work,
                         msecs_to_jiffies(devfreq->profile->polling_ms));
+
+        devfreq->last_stat_updated = jiffies;
         devfreq->stop_polling = false;
 
+        if (devfreq->profile->get_cur_freq &&
+                !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
+                devfreq->previous_freq = freq;
+
 out:
         mutex_unlock(&devfreq->lock);
 }
@@ -905,11 +914,11 @@ static ssize_t show_trans_table(struct device *dev, struct device_attribute *att
 {
         struct devfreq *devfreq = to_devfreq(dev);
         ssize_t len;
-        int i, j, err;
+        int i, j;
         unsigned int max_state = devfreq->profile->max_state;
 
-        err = devfreq_update_status(devfreq, devfreq->previous_freq);
-        if (err)
+        if (!devfreq->stop_polling &&
+                        devfreq_update_status(devfreq, devfreq->previous_freq))
                 return 0;
 
         len = sprintf(buf, "   From  :   To\n");