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authorZhang Rui <rui.zhang@intel.com>2012-11-19 16:10:20 +0800
committerZhang Rui <rui.zhang@intel.com>2013-01-04 15:22:37 +0800
commit3dbfff3dfe6714aeefb615c65bec0800dc5a4c51 (patch)
tree1b9deca1bad750a932c435c9187f976494180070 /drivers/thermal/step_wise.c
parentd069015e268bcac6c8bd8997b3235f5f977d3ab6 (diff)
downloadlinux-linaro-stable-3dbfff3dfe6714aeefb615c65bec0800dc5a4c51.tar.gz
Introduce THERMAL_TREND_RAISE/DROP_FULL support for step_wise governor
step_wise governor should set the device cooling state to upper/lower limit directly when THERMAL_TREND_RAISE/DROP_FULL. Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal/step_wise.c')
-rw-r--r--drivers/thermal/step_wise.c64
1 files changed, 46 insertions, 18 deletions
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index 0cd5e9fbab1c..f45dd0f768f0 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -35,21 +35,54 @@
* state for this trip point
* b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
* state for this trip point
+ * c. if the trend is THERMAL_TREND_RAISE_FULL, use upper limit
+ * for this trip point
+ * d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit
+ * for this trip point
+ * If the temperature is lower than a trip point,
+ * a. if the trend is THERMAL_TREND_RAISING, do nothing
+ * b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
+ * state for this trip point, if the cooling state already
+ * equals lower limit, deactivate the thermal instance
+ * c. if the trend is THERMAL_TREND_RAISE_FULL, do nothing
+ * d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit,
+ * if the cooling state already equals lower limit,
+ * deactive the thermal instance
*/
static unsigned long get_target_state(struct thermal_instance *instance,
- enum thermal_trend trend)
+ enum thermal_trend trend, bool throttle)
{
struct thermal_cooling_device *cdev = instance->cdev;
unsigned long cur_state;
cdev->ops->get_cur_state(cdev, &cur_state);
- if (trend == THERMAL_TREND_RAISING) {
- cur_state = cur_state < instance->upper ?
- (cur_state + 1) : instance->upper;
- } else if (trend == THERMAL_TREND_DROPPING) {
- cur_state = cur_state > instance->lower ?
- (cur_state - 1) : instance->lower;
+ switch (trend) {
+ case THERMAL_TREND_RAISING:
+ if (throttle)
+ cur_state = cur_state < instance->upper ?
+ (cur_state + 1) : instance->upper;
+ break;
+ case THERMAL_TREND_RAISE_FULL:
+ if (throttle)
+ cur_state = instance->upper;
+ break;
+ case THERMAL_TREND_DROPPING:
+ if (cur_state == instance->lower) {
+ if (!throttle)
+ cur_state = -1;
+ } else
+ cur_state -= 1;
+ break;
+ case THERMAL_TREND_DROP_FULL:
+ if (cur_state == instance->lower) {
+ if (!throttle)
+ cur_state = -1;
+ } else
+ cur_state = instance->lower;
+ break;
+ default:
+ break;
}
return cur_state;
@@ -76,7 +109,7 @@ static void update_instance_for_throttle(struct thermal_zone_device *tz,
if (instance->trip != trip)
continue;
- instance->target = get_target_state(instance, trend);
+ instance->target = get_target_state(instance, trend, true);
/* Activate a passive thermal instance */
if (instance->target == THERMAL_NO_TARGET)
@@ -87,28 +120,23 @@ static void update_instance_for_throttle(struct thermal_zone_device *tz,
}
static void update_instance_for_dethrottle(struct thermal_zone_device *tz,
- int trip, enum thermal_trip_type trip_type)
+ int trip, enum thermal_trip_type trip_type,
+ enum thermal_trend trend)
{
struct thermal_instance *instance;
- struct thermal_cooling_device *cdev;
- unsigned long cur_state;
list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
if (instance->trip != trip ||
instance->target == THERMAL_NO_TARGET)
continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &cur_state);
-
- instance->target = cur_state > instance->lower ?
- (cur_state - 1) : THERMAL_NO_TARGET;
+ instance->target = get_target_state(instance, trend, false);
/* Deactivate a passive thermal instance */
if (instance->target == THERMAL_NO_TARGET)
update_passive_instance(tz, trip_type, -1);
- cdev->updated = false; /* cdev needs update */
+ instance->cdev->updated = false; /* cdev needs update */
}
}
@@ -133,7 +161,7 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
if (tz->temperature >= trip_temp)
update_instance_for_throttle(tz, trip, trip_type, trend);
else
- update_instance_for_dethrottle(tz, trip, trip_type);
+ update_instance_for_dethrottle(tz, trip, trip_type, trend);
mutex_unlock(&tz->lock);
}