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Diffstat (limited to 'drivers/thermal/step_wise.c')
-rw-r--r--drivers/thermal/step_wise.c164
1 files changed, 91 insertions, 73 deletions
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index 0cd5e9fbab1..f251521baaa 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -22,9 +22,6 @@
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
#include <linux/thermal.h>
#include "thermal_core.h"
@@ -35,24 +32,71 @@
* state for this trip point
* b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
* state for this trip point
+ * c. if the trend is THERMAL_TREND_RAISE_FULL, use upper limit
+ * for this trip point
+ * d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit
+ * for this trip point
+ * If the temperature is lower than a trip point,
+ * a. if the trend is THERMAL_TREND_RAISING, do nothing
+ * b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
+ * state for this trip point, if the cooling state already
+ * equals lower limit, deactivate the thermal instance
+ * c. if the trend is THERMAL_TREND_RAISE_FULL, do nothing
+ * d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit,
+ * if the cooling state already equals lower limit,
+ * deactive the thermal instance
*/
static unsigned long get_target_state(struct thermal_instance *instance,
- enum thermal_trend trend)
+ enum thermal_trend trend, bool throttle)
{
struct thermal_cooling_device *cdev = instance->cdev;
unsigned long cur_state;
+ unsigned long next_target;
+ /*
+ * We keep this instance the way it is by default.
+ * Otherwise, we use the current state of the
+ * cdev in use to determine the next_target.
+ */
cdev->ops->get_cur_state(cdev, &cur_state);
-
- if (trend == THERMAL_TREND_RAISING) {
- cur_state = cur_state < instance->upper ?
- (cur_state + 1) : instance->upper;
- } else if (trend == THERMAL_TREND_DROPPING) {
- cur_state = cur_state > instance->lower ?
- (cur_state - 1) : instance->lower;
+ next_target = instance->target;
+ dev_dbg(&cdev->device, "cur_state=%ld\n", cur_state);
+
+ switch (trend) {
+ case THERMAL_TREND_RAISING:
+ if (throttle) {
+ next_target = cur_state < instance->upper ?
+ (cur_state + 1) : instance->upper;
+ if (next_target < instance->lower)
+ next_target = instance->lower;
+ }
+ break;
+ case THERMAL_TREND_RAISE_FULL:
+ if (throttle)
+ next_target = instance->upper;
+ break;
+ case THERMAL_TREND_DROPPING:
+ if (cur_state == instance->lower) {
+ if (!throttle)
+ next_target = THERMAL_NO_TARGET;
+ } else {
+ next_target = cur_state - 1;
+ if (next_target > instance->upper)
+ next_target = instance->upper;
+ }
+ break;
+ case THERMAL_TREND_DROP_FULL:
+ if (cur_state == instance->lower) {
+ if (!throttle)
+ next_target = THERMAL_NO_TARGET;
+ } else
+ next_target = instance->lower;
+ break;
+ default:
+ break;
}
- return cur_state;
+ return next_target;
}
static void update_passive_instance(struct thermal_zone_device *tz,
@@ -66,57 +110,14 @@ static void update_passive_instance(struct thermal_zone_device *tz,
tz->passive += value;
}
-static void update_instance_for_throttle(struct thermal_zone_device *tz,
- int trip, enum thermal_trip_type trip_type,
- enum thermal_trend trend)
-{
- struct thermal_instance *instance;
-
- list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
- if (instance->trip != trip)
- continue;
-
- instance->target = get_target_state(instance, trend);
-
- /* Activate a passive thermal instance */
- if (instance->target == THERMAL_NO_TARGET)
- update_passive_instance(tz, trip_type, 1);
-
- instance->cdev->updated = false; /* cdev needs update */
- }
-}
-
-static void update_instance_for_dethrottle(struct thermal_zone_device *tz,
- int trip, enum thermal_trip_type trip_type)
-{
- struct thermal_instance *instance;
- struct thermal_cooling_device *cdev;
- unsigned long cur_state;
-
- list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
- if (instance->trip != trip ||
- instance->target == THERMAL_NO_TARGET)
- continue;
-
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &cur_state);
-
- instance->target = cur_state > instance->lower ?
- (cur_state - 1) : THERMAL_NO_TARGET;
-
- /* Deactivate a passive thermal instance */
- if (instance->target == THERMAL_NO_TARGET)
- update_passive_instance(tz, trip_type, -1);
-
- cdev->updated = false; /* cdev needs update */
- }
-}
-
static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
{
long trip_temp;
enum thermal_trip_type trip_type;
enum thermal_trend trend;
+ struct thermal_instance *instance;
+ bool throttle = false;
+ int old_target;
if (trip == THERMAL_TRIPS_NONE) {
trip_temp = tz->forced_passive;
@@ -128,12 +129,38 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
trend = get_tz_trend(tz, trip);
+ if (tz->temperature >= trip_temp)
+ throttle = true;
+
+ dev_dbg(&tz->device, "Trip%d[type=%d,temp=%ld]:trend=%d,throttle=%d\n",
+ trip, trip_type, trip_temp, trend, throttle);
+
mutex_lock(&tz->lock);
- if (tz->temperature >= trip_temp)
- update_instance_for_throttle(tz, trip, trip_type, trend);
- else
- update_instance_for_dethrottle(tz, trip, trip_type);
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ if (instance->trip != trip)
+ continue;
+
+ old_target = instance->target;
+ instance->target = get_target_state(instance, trend, throttle);
+ dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",
+ old_target, (int)instance->target);
+
+ if (old_target == instance->target)
+ continue;
+
+ /* Activate a passive thermal instance */
+ if (old_target == THERMAL_NO_TARGET &&
+ instance->target != THERMAL_NO_TARGET)
+ update_passive_instance(tz, trip_type, 1);
+ /* Deactivate a passive thermal instance */
+ else if (old_target != THERMAL_NO_TARGET &&
+ instance->target == THERMAL_NO_TARGET)
+ update_passive_instance(tz, trip_type, -1);
+
+
+ instance->cdev->updated = false; /* cdev needs update */
+ }
mutex_unlock(&tz->lock);
}
@@ -172,23 +199,14 @@ static int step_wise_throttle(struct thermal_zone_device *tz, int trip)
static struct thermal_governor thermal_gov_step_wise = {
.name = "step_wise",
.throttle = step_wise_throttle,
- .owner = THIS_MODULE,
};
-static int __init thermal_gov_step_wise_init(void)
+int thermal_gov_step_wise_register(void)
{
return thermal_register_governor(&thermal_gov_step_wise);
}
-static void __exit thermal_gov_step_wise_exit(void)
+void thermal_gov_step_wise_unregister(void)
{
thermal_unregister_governor(&thermal_gov_step_wise);
}
-
-/* This should load after thermal framework */
-fs_initcall(thermal_gov_step_wise_init);
-module_exit(thermal_gov_step_wise_exit);
-
-MODULE_AUTHOR("Durgadoss R");
-MODULE_DESCRIPTION("A step-by-step thermal throttling governor");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 16:05:14 +0000