mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
93 lines
3.5 KiB
Diff
93 lines
3.5 KiB
Diff
From 431dbdb7301aad021ebfd89a4f6177b7c25f3322 Mon Sep 17 00:00:00 2001
|
|
From: Ram Chandrasekar <rkumbako@codeaurora.org>
|
|
Date: Mon, 7 May 2018 11:54:08 -0600
|
|
Subject: [PATCH 152/726] drivers: thermal: step_wise: add support for
|
|
hysteresis
|
|
|
|
Step wise governor increases the mitigation level when the temperature
|
|
goes above a threshold and will decrease the mitigation when the
|
|
temperature falls below the threshold. If it were a case, where the
|
|
temperature hovers around a threshold, the mitigation will be applied
|
|
and removed at every iteration. This reaction to the temperature is
|
|
inefficient for performance.
|
|
|
|
The use of hysteresis temperature could avoid this ping-pong of
|
|
mitigation by relaxing the mitigation to happen only when the
|
|
temperature goes below this lower hysteresis value.
|
|
|
|
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>
|
|
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
|
|
---
|
|
drivers/thermal/gov_step_wise.c | 34 ++++++++++++++++++++++++---------
|
|
1 file changed, 25 insertions(+), 9 deletions(-)
|
|
|
|
diff --git a/drivers/thermal/gov_step_wise.c b/drivers/thermal/gov_step_wise.c
|
|
index cdd3354bc27f..d5097e2cd6cc 100644
|
|
--- a/drivers/thermal/gov_step_wise.c
|
|
+++ b/drivers/thermal/gov_step_wise.c
|
|
@@ -25,7 +25,7 @@
|
|
* 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,
|
|
+ * If the temperature is lower than a hysteresis temperature,
|
|
* 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
|
|
@@ -97,7 +97,7 @@ static void update_passive_instance(struct thermal_zone_device *tz,
|
|
|
|
static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
|
|
{
|
|
- int trip_temp;
|
|
+ int trip_temp, hyst_temp;
|
|
enum thermal_trip_type trip_type;
|
|
enum thermal_trend trend;
|
|
struct thermal_instance *instance;
|
|
@@ -107,21 +107,37 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
|
|
tz->ops->get_trip_temp(tz, trip, &trip_temp);
|
|
tz->ops->get_trip_type(tz, trip, &trip_type);
|
|
|
|
- trend = get_tz_trend(tz, trip);
|
|
-
|
|
- if (tz->temperature >= trip_temp) {
|
|
- throttle = true;
|
|
- trace_thermal_zone_trip(tz, trip, trip_type);
|
|
+ tz->ops->get_trip_temp(tz, trip, &trip_temp);
|
|
+ hyst_temp = trip_temp;
|
|
+ if (tz->ops->get_trip_hyst) {
|
|
+ tz->ops->get_trip_hyst(tz, trip, &hyst_temp);
|
|
+ hyst_temp = trip_temp - hyst_temp;
|
|
}
|
|
+ tz->ops->get_trip_type(tz, trip, &trip_type);
|
|
|
|
- dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",
|
|
- trip, trip_type, trip_temp, trend, throttle);
|
|
+ trend = get_tz_trend(tz, trip);
|
|
+
|
|
+ dev_dbg(&tz->device,
|
|
+ "Trip%d[type=%d,temp=%d,hyst=%d]:trend=%d,throttle=%d\n",
|
|
+ trip, trip_type, trip_temp, hyst_temp, trend, throttle);
|
|
|
|
list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
|
|
if (instance->trip != trip)
|
|
continue;
|
|
|
|
old_target = instance->target;
|
|
+ throttle = false;
|
|
+ /*
|
|
+ * Lower the mitigation only if the temperature
|
|
+ * goes below the hysteresis temperature.
|
|
+ */
|
|
+ if (tz->temperature >= trip_temp ||
|
|
+ (tz->temperature >= hyst_temp &&
|
|
+ old_target != THERMAL_NO_TARGET)) {
|
|
+ throttle = true;
|
|
+ trace_thermal_zone_trip(tz, trip, trip_type);
|
|
+ }
|
|
+
|
|
instance->target = get_target_state(instance, trend, throttle);
|
|
dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",
|
|
old_target, (int)instance->target);
|
|
--
|
|
2.33.1
|
|
|