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drivers: thermal: step_wise: add support for hysteresis #5936

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Feb 9, 2024
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drivers: thermal: step_wise: add support for hysteresis #5936

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23 changes: 17 additions & 6 deletions drivers/thermal/gov_step_wise.c
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Original file line number Diff line number Diff line change
Expand Up @@ -86,22 +86,33 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip_id
struct thermal_instance *instance;
bool throttle = false;
int old_target;
int hyst_temp;

trend = get_tz_trend(tz, trip_id);

if (tz->temperature >= trip->temperature) {
throttle = true;
trace_thermal_zone_trip(tz, trip_id, trip->type);
}
hyst_temp = trip->temperature - trip->hysteresis;

dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",
trip_id, trip->type, trip->temperature, trend, throttle);
dev_dbg(&tz->device,
"Trip%d[type=%d,temp=%d,hyst=%d]:trend=%d,throttle=%d\n",
trip_id, trip->type, trip->temperature, hyst_temp, trend, throttle);

list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
if (instance->trip != trip)
continue;

old_target = instance->target;
throttle = false;
/*
* Lower the mitigation only if the temperature
* goes below the hysteresis temperature.
*/
if (tz->temperature >= trip->temperature ||
(tz->temperature >= hyst_temp &&
old_target == instance->upper)) {
throttle = true;
trace_thermal_zone_trip(tz, trip_id, trip->type);
}

instance->target = get_target_state(instance, trend, throttle);
dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",
old_target, (int)instance->target);
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