thermal: trip: Send trip change notifications on all trip updates

The _store callbacks of the trip point temperature and hysteresis sysfs
attributes invoke thermal_notify_tz_trip_change() to send a notification
regarding the trip point change, but when trip points are updated by the
platform firmware, trip point change notifications are not sent.

To make the behavior after a trip point change more consistent,
modify all of the 3 places where trip point temperature is updated
to use a new function called thermal_zone_set_trip_temp() for this
purpose and make that function call thermal_notify_tz_trip_change().

Note that trip point hysteresis can only be updated via sysfs and
trip_point_hyst_store() calls thermal_notify_tz_trip_change() already,
so this code path need not be changed.

Signed-off-by: Rafael J. Wysocki <[email protected]>
Acked-by: Daniel Lezcano <[email protected]>

Author: rafaeljw

drivers/acpi/thermal.c

@@ -297,6 +297,7 @@ static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
 	struct acpi_thermal_trip *acpi_trip = trip->priv;
 	struct adjust_trip_data *atd = data;
 	struct acpi_thermal *tz = atd->tz;
+	int temp;
 
 	if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
 		return 0;
@@ -307,9 +308,11 @@ static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
 		acpi_thermal_update_trip_devices(tz, trip);
 
 	if (acpi_thermal_trip_valid(acpi_trip))
-		trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
+		temp = acpi_thermal_temp(tz, acpi_trip->temp_dk);
 	else
-		trip->temperature = THERMAL_TEMP_INVALID;
+		temp = THERMAL_TEMP_INVALID;
+
+	thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp);
 
 	return 0;
 }

drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c

@@ -225,7 +225,8 @@ EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove);
 
 static int int340x_update_one_trip(struct thermal_trip *trip, void *arg)
 {
-	struct acpi_device *zone_adev = arg;
+	struct int34x_thermal_zone *int34x_zone = arg;
+	struct acpi_device *zone_adev = int34x_zone->adev;
 	int temp, err;
 
 	switch (trip->type) {
@@ -249,14 +250,15 @@ static int int340x_update_one_trip(struct thermal_trip *trip, void *arg)
 	if (err)
 		temp = THERMAL_TEMP_INVALID;
 
-	trip->temperature = temp;
+	thermal_zone_set_trip_temp(int34x_zone->zone, trip, temp);
+
 	return 0;
 }
 
 void int340x_thermal_update_trips(struct int34x_thermal_zone *int34x_zone)
 {
 	thermal_zone_for_each_trip(int34x_zone->zone, int340x_update_one_trip,
-				   int34x_zone->adev);
+				   int34x_zone);
 }
 EXPORT_SYMBOL_GPL(int340x_thermal_update_trips);
 

drivers/thermal/thermal_sysfs.c

@@ -129,9 +129,9 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 				goto unlock;
 		}
 
-		trip->temperature = temp;
+		thermal_zone_set_trip_temp(tz, trip, temp);
 
-		thermal_zone_trip_updated(tz, trip);
+		__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
 	}
 
 unlock:

drivers/thermal/thermal_trip.c

@@ -152,7 +152,6 @@ int thermal_zone_trip_id(struct thermal_zone_device *tz,
 	 */
 	return trip - tz->trips;
 }
-
 void thermal_zone_trip_updated(struct thermal_zone_device *tz,
 			       const struct thermal_trip *trip)
 {
@@ -161,3 +160,16 @@ void thermal_zone_trip_updated(struct thermal_zone_device *tz,
 				      trip->hysteresis);
 	__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
 }
+
+void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
+				struct thermal_trip *trip, int temp)
+{
+	if (trip->temperature == temp)
+		return;
+
+	trip->temperature = temp;
+	thermal_notify_tz_trip_change(tz->id, thermal_zone_trip_id(tz, trip),
+				      trip->type, trip->temperature,
+				      trip->hysteresis);
+}
+EXPORT_SYMBOL_GPL(thermal_zone_set_trip_temp);

include/linux/thermal.h

@@ -291,6 +291,8 @@ int thermal_zone_for_each_trip(struct thermal_zone_device *tz,
 			       int (*cb)(struct thermal_trip *, void *),
 			       void *data);
 int thermal_zone_get_num_trips(struct thermal_zone_device *tz);
+void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
+				struct thermal_trip *trip, int temp);
 
 int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);