drivers/thermal/gov_step_wise.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  *  step_wise.c - A step-by-step Thermal throttling governor
20  * If the temperature is higher than a trip point,
21  *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
24  * If the temperature is lower than a trip point,
33 	struct thermal_cooling_device *cdev = instance->cdev;  in get_target_state()
41 	cdev->ops->get_cur_state(cdev, &cur_state);  in get_target_state()
42 	dev_dbg(&cdev->device, "cur_state=%ld\n", cur_state);  in get_target_state()
44 	if (!instance->initialized) {  in get_target_state()
46 			return clamp(cur_state + 1, instance->lower, instance->upper);  in get_target_state()
53 			return clamp(cur_state + 1, instance->lower, instance->upper);  in get_target_state()
55 		if (cur_state <= instance->lower)  in get_target_state()
62 		return instance->lower;  in get_target_state()
65 	return instance->target;  in get_target_state()
77 	if (tz->temperature >= trip_threshold) {  in thermal_zone_trip_update()
79 		trace_thermal_zone_trip(tz, trip_id, trip->type);  in thermal_zone_trip_update()
82 	dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",  in thermal_zone_trip_update()
83 		trip_id, trip->type, trip_threshold, trend, throttle);  in thermal_zone_trip_update()
85 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in thermal_zone_trip_update()
88 		if (instance->trip != trip)  in thermal_zone_trip_update()
91 		old_target = instance->target;  in thermal_zone_trip_update()
92 		instance->target = get_target_state(instance, trend, throttle);  in thermal_zone_trip_update()
94 		dev_dbg(&instance->cdev->device, "old_target=%d, target=%ld\n",  in thermal_zone_trip_update()
95 			old_target, instance->target);  in thermal_zone_trip_update()
97 		if (instance->initialized && old_target == instance->target)  in thermal_zone_trip_update()
100 		instance->initialized = true;  in thermal_zone_trip_update()
102 		mutex_lock(&instance->cdev->lock);  in thermal_zone_trip_update()
103 		instance->cdev->updated = false; /* cdev needs update */  in thermal_zone_trip_update()
104 		mutex_unlock(&instance->cdev->lock);  in thermal_zone_trip_update()
113 	lockdep_assert_held(&tz->lock);  in step_wise_manage()
123 		const struct thermal_trip *trip = &td->trip;  in step_wise_manage()
125 		if (trip->temperature == THERMAL_TEMP_INVALID ||  in step_wise_manage()
126 		    trip->type == THERMAL_TRIP_CRITICAL ||  in step_wise_manage()
127 		    trip->type == THERMAL_TRIP_HOT)  in step_wise_manage()
130 		thermal_zone_trip_update(tz, trip, td->threshold);  in step_wise_manage()
133 	list_for_each_entry(instance, &tz->thermal_instances, tz_node)  in step_wise_manage()
134 		thermal_cdev_update(instance->cdev);  in step_wise_manage()