PM / devfreq: Don't adjust to user limits in governors

Several governors use the user space limits df->min/max_freq to adjust
the target frequency. This is not necessary, since update_devfreq()
already takes care of this. Instead the governor can request the available
min/max frequency by setting the target frequency to DEVFREQ_MIN/MAX_FREQ
and let update_devfreq() take care of any adjustments.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

5 files changed, 12 insertions, 26 deletions

diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
index cfc50a61a90d..b81700244ce3 100644
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -25,6 +25,9 @@
 #define DEVFREQ_GOV_SUSPEND                     0x4
 #define DEVFREQ_GOV_RESUME                      0x5
 
+#define DEVFREQ_MIN_FREQ                        0
+#define DEVFREQ_MAX_FREQ                        ULONG_MAX
+
 /**
  * struct devfreq_governor - Devfreq policy governor
  * @node:               list node - contains registered devfreq governors
diff --git a/drivers/devfreq/governor_performance.c b/drivers/devfreq/governor_performance.c
index 4d23ecfbd948..ded429fd51be 100644
--- a/drivers/devfreq/governor_performance.c
+++ b/drivers/devfreq/governor_performance.c
@@ -20,10 +20,7 @@ static int devfreq_performance_func(struct devfreq *df,
          * target callback should be able to get floor value as
          * said in devfreq.h
          */
-        if (!df->max_freq)
-                *freq = UINT_MAX;
-        else
-                *freq = df->max_freq;
+        *freq = DEVFREQ_MAX_FREQ;
         return 0;
 }
 
diff --git a/drivers/devfreq/governor_powersave.c b/drivers/devfreq/governor_powersave.c
index 0c42f23249ef..9e8897f5ac42 100644
--- a/drivers/devfreq/governor_powersave.c
+++ b/drivers/devfreq/governor_powersave.c
@@ -20,7 +20,7 @@ static int devfreq_powersave_func(struct devfreq *df,
          * target callback should be able to get ceiling value as
          * said in devfreq.h
          */
-        *freq = df->min_freq;
+        *freq = DEVFREQ_MIN_FREQ;
         return 0;
 }
 
diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
index 28e0f2de7100..c0417f0e081e 100644
--- a/drivers/devfreq/governor_simpleondemand.c
+++ b/drivers/devfreq/governor_simpleondemand.c
@@ -27,7 +27,6 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
         unsigned int dfso_upthreshold = DFSO_UPTHRESHOLD;
         unsigned int dfso_downdifferential = DFSO_DOWNDIFFERENCTIAL;
         struct devfreq_simple_ondemand_data *data = df->data;
-        unsigned long max = (df->max_freq) ? df->max_freq : UINT_MAX;
 
         err = devfreq_update_stats(df);
         if (err)
@@ -47,7 +46,7 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
 
         /* Assume MAX if it is going to be divided by zero */
         if (stat->total_time == 0) {
-                *freq = max;
+                *freq = DEVFREQ_MAX_FREQ;
                 return 0;
         }
 
@@ -60,13 +59,13 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
         /* Set MAX if it's busy enough */
         if (stat->busy_time * 100 >
             stat->total_time * dfso_upthreshold) {
-                *freq = max;
+                *freq = DEVFREQ_MAX_FREQ;
                 return 0;
         }
 
         /* Set MAX if we do not know the initial frequency */
         if (stat->current_frequency == 0) {
-                *freq = max;
+                *freq = DEVFREQ_MAX_FREQ;
                 return 0;
         }
 
@@ -85,11 +84,6 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
         b = div_u64(b, (dfso_upthreshold - dfso_downdifferential / 2));
         *freq = (unsigned long) b;
 
-        if (df->min_freq && *freq < df->min_freq)
-                *freq = df->min_freq;
-        if (df->max_freq && *freq > df->max_freq)
-                *freq = df->max_freq;
-
         return 0;
 }
 
diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c
index 080607c3f34d..378d84c011df 100644
--- a/drivers/devfreq/governor_userspace.c
+++ b/drivers/devfreq/governor_userspace.c
@@ -26,19 +26,11 @@ static int devfreq_userspace_func(struct devfreq *df, unsigned long *freq)
 {
         struct userspace_data *data = df->data;
 
-        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 {
+        if (data->valid)
+                *freq = data->user_frequency;
+        else
                 *freq = df->previous_freq; /* No user freq specified yet */
-        }
+
         return 0;
 }