drivers: thermal: step_wise: avoid throttling at hysteresis temperature after dropping below it

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------
Signed-off-by: NSerge Schneider <serge@raspberrypi.org>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/thermal/gov_step_wise.c

@@ -155,7 +155,7 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
 		 */
 		if (tz->temperature >= trip_temp ||
 		   (tz->temperature >= hyst_temp &&
-		   old_target != THERMAL_NO_TARGET)) {
+		   old_target == instance->upper)) {
 			throttle = true;
 			trace_thermal_zone_trip(tz, trip, trip_type);
 		}