drivers/thermal/gov_fair_share.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  *  fair_share.c - A simple weight based Thermal governor
19  * get_trip_level: - obtains the current trip level for a zone
27 	for (count = 0; count < tz->num_trips; count++) {  in get_trip_level()
29 		if (tz->temperature < trip.temperature)  in get_trip_level()
35 	 * point, in which case, trip_point = count - 1  in get_trip_level()
38 		trace_thermal_zone_trip(tz, count - 1, trip.type);  in get_trip_level()
46 	return (long)(percentage * level * cdev->max_state) / (100 * tz->num_trips);  in get_target_state()
50  * fair_share_throttle - throttles devices associated with the given zone
55  * throttle state of the cooling devices associated with the given zone.
58  * P1. max_state: Maximum throttle state exposed by the cooling device.
60  *	How 'effective' the 'i'th device is, in cooling the given zone.
64  *	whereas the throttling is at full swing if we trip critical levels.
66  * new_state of cooling device = P3 * P2 * P1
70 	const struct thermal_trip *trip = &tz->trips[trip_index];  in fair_share_throttle()
76 	lockdep_assert_held(&tz->lock);  in fair_share_throttle()
78 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in fair_share_throttle()
79 		if (instance->trip != trip)  in fair_share_throttle()
82 		total_weight += instance->weight;  in fair_share_throttle()
86 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in fair_share_throttle()
88 		struct thermal_cooling_device *cdev = instance->cdev;  in fair_share_throttle()
90 		if (instance->trip != trip)  in fair_share_throttle()
96 			percentage = (instance->weight * 100) / total_weight;  in fair_share_throttle()
98 		instance->target = get_target_state(tz, cdev, percentage,  in fair_share_throttle()
101 		mutex_lock(&cdev->lock);  in fair_share_throttle()
103 		mutex_unlock(&cdev->lock);  in fair_share_throttle()