PM / devfreq: add min/max_freq limit requested by users.

The frequency requested to devfreq device driver from devfreq governors
is restricted by min_freq and max_freq input.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c
index 4f8b563da782..0681246fc89d 100644
--- a/drivers/devfreq/governor_userspace.c
+++ b/drivers/devfreq/governor_userspace.c
@@ -25,10 +25,19 @@ static int devfreq_userspace_func(struct devfreq *df, unsigned long *freq)
 {
         struct userspace_data *data = df->data;
 
-        if (!data->valid)
+        if (data->valid) {
+                unsigned long adjusted_freq = data->user_frequency;
+
+                if (df->max_freq && adjusted_freq > df->max_freq)
+                        adjusted_freq = df->max_freq;
+
+                if (df->min_freq && adjusted_freq < df->min_freq)
+                        adjusted_freq = df->min_freq;
+
+                *freq = adjusted_freq;
+        } else {
                 *freq = df->previous_freq; /* No user freq specified yet */
-        else
-                *freq = data->user_frequency;
+        }
         return 0;
 }