1 files changed, 41 insertions, 3 deletions

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 70045c12d7d..36ae2f43ee2 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -41,6 +41,7 @@ MODULE_AUTHOR("Zhang Rui");
 MODULE_DESCRIPTION("Generic thermal management sysfs support");
 MODULE_LICENSE("GPL");
 
+#define THERMAL_NO_TARGET -1UL
 /*
  * This structure is used to describe the behavior of
  * a certain cooling device on a certain trip point
@@ -54,6 +55,7 @@ struct thermal_instance {
 	int trip;
 	unsigned long upper;	/* Highest cooling state for this trip point */
 	unsigned long lower;	/* Lowest cooling state for this trip point */
+	unsigned long target;	/* expected cooling state */
 	char attr_name[THERMAL_NAME_LENGTH];
 	struct device_attribute attr;
 	struct list_head tz_node; /* node in tz->thermal_instances */
@@ -853,6 +855,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 	dev->trip = trip;
 	dev->upper = upper;
 	dev->lower = lower;
+	dev->target = THERMAL_NO_TARGET;
 
 	result = get_idr(&tz->idr, &tz->lock, &dev->id);
 	if (result)
@@ -990,6 +993,7 @@ thermal_cooling_device_register(char *type, void *devdata,
 	strcpy(cdev->type, type);
 	INIT_LIST_HEAD(&cdev->thermal_instances);
 	cdev->ops = ops;
+	cdev->updated = true;
 	cdev->device.class = &thermal_class;
 	cdev->devdata = devdata;
 	dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
@@ -1081,6 +1085,34 @@ void thermal_cooling_device_unregister(struct
 }
 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 
+static void thermal_cdev_do_update(struct thermal_cooling_device *cdev)
+{
+	struct thermal_instance *instance;
+	unsigned long target = 0;
+
+	/* cooling device is updated*/
+	if (cdev->updated)
+		return;
+
+	/* Make sure cdev enters the deepest cooling state */
+	list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
+		if (instance->target == THERMAL_NO_TARGET)
+			continue;
+		if (instance->target > target)
+			target = instance->target;
+	}
+	cdev->ops->set_cur_state(cdev, target);
+	cdev->updated = true;
+}
+
+static void thermal_zone_do_update(struct thermal_zone_device *tz)
+{
+	struct thermal_instance *instance;
+
+	list_for_each_entry(instance, &tz->thermal_instances, tz_node)
+		thermal_cdev_do_update(instance->cdev);
+}
+
 /*
  * Cooling algorithm for active trip points
  *
@@ -1138,19 +1170,24 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
 				cur_state = cur_state > instance->lower ?
 				    (cur_state - 1) : instance->lower;
 			}
-			cdev->ops->set_cur_state(cdev, cur_state);
+			instance->target = cur_state;
+			cdev->updated = false; /* cooling device needs update */
 		}
 	} else {	/* below trip */
 		list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
 			if (instance->trip != trip)
 				continue;
 
+			/* Do not use the inactive thermal instance */
+			if (instance->target == THERMAL_NO_TARGET)
+				continue;
 			cdev = instance->cdev;
 			cdev->ops->get_cur_state(cdev, &cur_state);
 
 			cur_state = cur_state > instance->lower ?
-				    (cur_state - 1) : instance->lower;
-			cdev->ops->set_cur_state(cdev, cur_state);
+				    (cur_state - 1) : THERMAL_NO_TARGET;
+			instance->target = cur_state;
+			cdev->updated = false; /* cooling device needs update */
 		}
 	}
 
@@ -1211,6 +1248,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
 		}
 	}
 
+	thermal_zone_do_update(tz);
 	if (tz->forced_passive)
 		thermal_zone_device_passive(tz, temp, tz->forced_passive,
 					    THERMAL_TRIPS_NONE);