1 // SPDX-License-Identifier: GPL-2.0-only
3  *  step_wise.c - A step-by-step Thermal throttling governor
26  *    d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit
28  * If the temperature is lower than a trip point,
30  *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
32  *       equals lower limit, deactivate the thermal instance
34  *    d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit,
35  *       if the cooling state already equals lower limit,
41 	struct thermal_cooling_device *cdev = instance->cdev;  in get_target_state()
50 	cdev->ops->get_cur_state(cdev, &cur_state);  in get_target_state()
51 	next_target = instance->target;  in get_target_state()
52 	dev_dbg(&cdev->device, "cur_state=%ld\n", cur_state);  in get_target_state()
54 	if (!instance->initialized) {  in get_target_state()
56 			next_target = clamp((cur_state + 1), instance->lower, instance->upper);  in get_target_state()
65 	case THERMAL_TREND_RAISING:  in get_target_state()
67 			next_target = clamp((cur_state + 1), instance->lower, instance->upper);  in get_target_state()
70 	case THERMAL_TREND_DROPPING:  in get_target_state()
71 		if (cur_state <= instance->lower) {  in get_target_state()
76 				next_target = clamp((cur_state - 1), instance->lower, instance->upper);  in get_target_state()
92 	 * If value is -1, deactivate a passive instance.  in update_passive_instance()
95 		tz->passive += value;  in update_passive_instance()
107 	tz->ops->get_trip_temp(tz, trip, &trip_temp);  in thermal_zone_trip_update()
108 	tz->ops->get_trip_type(tz, trip, &trip_type);  in thermal_zone_trip_update()
112 	if (tz->temperature >= trip_temp) {  in thermal_zone_trip_update()
117 	dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",  in thermal_zone_trip_update()
120 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in thermal_zone_trip_update()
121 		if (instance->trip != trip)  in thermal_zone_trip_update()
124 		old_target = instance->target;  in thermal_zone_trip_update()
125 		instance->target = get_target_state(instance, trend, throttle);  in thermal_zone_trip_update()
126 		dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",  in thermal_zone_trip_update()
127 					old_target, (int)instance->target);  in thermal_zone_trip_update()
129 		if (instance->initialized && old_target == instance->target)  in thermal_zone_trip_update()
134 			instance->target != THERMAL_NO_TARGET)  in thermal_zone_trip_update()
138 			instance->target == THERMAL_NO_TARGET)  in thermal_zone_trip_update()
139 			update_passive_instance(tz, trip_type, -1);  in thermal_zone_trip_update()
141 		instance->initialized = true;  in thermal_zone_trip_update()
142 		mutex_lock(&instance->cdev->lock);  in thermal_zone_trip_update()
143 		instance->cdev->updated = false; /* cdev needs update */  in thermal_zone_trip_update()
144 		mutex_unlock(&instance->cdev->lock);  in thermal_zone_trip_update()
149  * step_wise_throttle - throttles devices associated with the given zone
163 	lockdep_assert_held(&tz->lock);  in step_wise_throttle()
167 	list_for_each_entry(instance, &tz->thermal_instances, tz_node)  in step_wise_throttle()
168 		thermal_cdev_update(instance->cdev);  in step_wise_throttle()