On Wednesday, July 25, 2012, Zhang Rui wrote:
> Remove thermal_zone_device_passive(). And use
> thermal_zone_trip_update() and thermal_zone_do_update()
> for both active and passive cooling.
>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
Reviewed-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---
> drivers/thermal/thermal_sys.c | 97 ++++++++++-------------------------------
> include/linux/thermal.h | 2 +-
> 2 files changed, 24 insertions(+), 75 deletions(-)
>
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index ee10df5..23a5c86 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -730,73 +730,6 @@ 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;
> -
> - /*
> - * 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;
> -
> - thermal_get_trend(tz, trip, &trend);
> -
> - /* 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
> @@ -1118,7 +1051,7 @@ 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
> @@ -1140,9 +1073,16 @@ 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 (temp >= trip_temp) {
> thermal_get_trend(tz, trip, &trend);
> @@ -1163,6 +1103,12 @@ 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 &&
> + instance->target == THERMAL_NO_TARGET)
> + tz->passive++;
> +
> instance->target = cur_state;
> cdev->updated = false; /* cooling device needs update */
> }
> @@ -1179,6 +1125,11 @@ 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 &&
> + cur_state == THERMAL_NO_TARGET)
> + tz->passive--;
> instance->target = cur_state;
> cdev->updated = false; /* cooling device needs update */
> }
> @@ -1235,16 +1186,14 @@ 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 3e66214..06fd04d 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;
>
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