diff options
| -rw-r--r-- | drivers/thermal/thermal_sys.c | 110 | ||||
| -rw-r--r-- | include/linux/thermal.h | 2 |
2 files changed, 26 insertions, 86 deletions
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 36ae2f43ee2e..6e9d3dc9d89b 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -715,84 +715,6 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, msecs_to_jiffies(delay)); } -static void thermal_zone_device_passive(struct thermal_zone_device *tz, - int temp, int trip_temp, int trip) -{ - enum thermal_trend trend; - struct thermal_instance *instance; - struct thermal_cooling_device *cdev; - long state, max_state; - - if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) { - /* - * compare the current temperature and previous temperature - * to get the thermal trend, if no special requirement - */ - if (tz->temperature > tz->last_temperature) - trend = THERMAL_TREND_RAISING; - else if (tz->temperature < tz->last_temperature) - trend = THERMAL_TREND_DROPPING; - else - trend = THERMAL_TREND_STABLE; - } - - /* - * Above Trip? - * ----------- - * Calculate the thermal trend (using the passive cooling equation) - * and modify the performance limit for all passive cooling devices - * accordingly. Note that we assume symmetry. - */ - if (temp >= trip_temp) { - tz->passive = true; - - /* Heating up? */ - if (trend == THERMAL_TREND_RAISING) { - list_for_each_entry(instance, &tz->thermal_instances, - tz_node) { - if (instance->trip != trip) - continue; - cdev = instance->cdev; - cdev->ops->get_cur_state(cdev, &state); - cdev->ops->get_max_state(cdev, &max_state); - if (state++ < max_state) - cdev->ops->set_cur_state(cdev, state); - } - } else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */ - list_for_each_entry(instance, &tz->thermal_instances, - tz_node) { - if (instance->trip != trip) - continue; - cdev = instance->cdev; - cdev->ops->get_cur_state(cdev, &state); - cdev->ops->get_max_state(cdev, &max_state); - if (state > 0) - cdev->ops->set_cur_state(cdev, --state); - } - } - return; - } - - /* - * Below Trip? - * ----------- - * Implement passive cooling hysteresis to slowly increase performance - * and avoid thrashing around the passive trip point. Note that we - * assume symmetry. - */ - list_for_each_entry(instance, &tz->thermal_instances, tz_node) { - if (instance->trip != trip) - continue; - cdev = instance->cdev; - cdev->ops->get_cur_state(cdev, &state); - cdev->ops->get_max_state(cdev, &max_state); - if (state > 0) - cdev->ops->set_cur_state(cdev, --state); - if (state == 0) - tz->passive = false; - } -} - static void thermal_zone_device_check(struct work_struct *work) { struct thermal_zone_device *tz = container_of(work, struct @@ -1114,7 +1036,7 @@ static void thermal_zone_do_update(struct thermal_zone_device *tz) } /* - * Cooling algorithm for active trip points + * Cooling algorithm for both active and passive cooling * * 1. if the temperature is higher than a trip point, * a. if the trend is THERMAL_TREND_RAISING, use higher cooling @@ -1136,9 +1058,16 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, struct thermal_cooling_device *cdev = NULL; unsigned long cur_state, max_state; long trip_temp; + enum thermal_trip_type trip_type; enum thermal_trend trend; - tz->ops->get_trip_temp(tz, trip, &trip_temp); + if (trip == THERMAL_TRIPS_NONE) { + trip_temp = tz->forced_passive; + trip_type = THERMAL_TRIPS_NONE; + } else { + tz->ops->get_trip_temp(tz, trip, &trip_temp); + tz->ops->get_trip_type(tz, trip, &trip_type); + } if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) { /* @@ -1170,6 +1099,13 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, cur_state = cur_state > instance->lower ? (cur_state - 1) : instance->lower; } + + /* activate a passive thermal instance */ + if ((trip_type == THERMAL_TRIP_PASSIVE || + trip_type == THERMAL_TRIPS_NONE) && + instance->target == THERMAL_NO_TARGET) + tz->passive++; + instance->target = cur_state; cdev->updated = false; /* cooling device needs update */ } @@ -1186,6 +1122,12 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, cur_state = cur_state > instance->lower ? (cur_state - 1) : THERMAL_NO_TARGET; + + /* deactivate a passive thermal instance */ + if ((trip_type == THERMAL_TRIP_PASSIVE || + trip_type == THERMAL_TRIPS_NONE) && + cur_state == THERMAL_NO_TARGET) + tz->passive--; instance->target = cur_state; cdev->updated = false; /* cooling device needs update */ } @@ -1242,16 +1184,14 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) break; case THERMAL_TRIP_PASSIVE: if (temp >= trip_temp || tz->passive) - thermal_zone_device_passive(tz, temp, - trip_temp, count); + thermal_zone_trip_update(tz, count, temp); break; } } - thermal_zone_do_update(tz); if (tz->forced_passive) - thermal_zone_device_passive(tz, temp, tz->forced_passive, - THERMAL_TRIPS_NONE); + thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp); + thermal_zone_do_update(tz); leave: if (tz->passive) diff --git a/include/linux/thermal.h b/include/linux/thermal.h index de0515a96f9f..76d0fe88eb1c 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -121,7 +121,7 @@ struct thermal_zone_device { int polling_delay; int temperature; int last_temperature; - bool passive; + int passive; unsigned int forced_passive; const struct thermal_zone_device_ops *ops; struct list_head thermal_instances; |