8f9e91ad03
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
90 lines
3.3 KiB
Diff
90 lines
3.3 KiB
Diff
From cef4ba037209392aa6437357c27ba7c450936e36 Mon Sep 17 00:00:00 2001
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From: Ram Chandrasekar <rkumbako@codeaurora.org>
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Date: Mon, 7 May 2018 11:54:08 -0600
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Subject: [PATCH] drivers: thermal: step_wise: add support for hysteresis
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Step wise governor increases the mitigation level when the temperature
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goes above a threshold and will decrease the mitigation when the
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temperature falls below the threshold. If it were a case, where the
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temperature hovers around a threshold, the mitigation will be applied
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and removed at every iteration. This reaction to the temperature is
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inefficient for performance.
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The use of hysteresis temperature could avoid this ping-pong of
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mitigation by relaxing the mitigation to happen only when the
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temperature goes below this lower hysteresis value.
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Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>
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Signed-off-by: Lina Iyer <ilina@codeaurora.org>
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drivers: thermal: step_wise: avoid throttling at hysteresis temperature after dropping below it
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Signed-off-by: Serge Schneider <serge@raspberrypi.org>
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Fix hysteresis support in gov_step_wise.c
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Directly get hyst value instead of going through an
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optional and, now, unimplemented function.
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Signed-off-by: Jürgen Kreileder <jk@blackdown.de>
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---
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drivers/thermal/gov_step_wise.c | 24 ++++++++++++++++++++----
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1 file changed, 20 insertions(+), 4 deletions(-)
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--- a/drivers/thermal/gov_step_wise.c
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+++ b/drivers/thermal/gov_step_wise.c
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@@ -17,11 +17,11 @@
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#include "thermal_core.h"
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/*
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- * If the temperature is higher than a trip point,
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+ * If the temperature is higher than a hysteresis temperature,
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* a. if the trend is THERMAL_TREND_RAISING, use higher cooling
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* state for this trip point
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* b. if the trend is THERMAL_TREND_DROPPING, do nothing
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- * If the temperature is lower than a trip point,
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+ * If the temperature is lower than a hysteresis temperature,
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* a. if the trend is THERMAL_TREND_RAISING, do nothing
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* b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
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* state for this trip point, if the cooling state already
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@@ -74,19 +74,35 @@ static void thermal_zone_trip_update(str
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int trip_id = thermal_zone_trip_id(tz, trip);
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struct thermal_instance *instance;
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bool throttle = false;
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+ int hyst_temp;
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if (tz->temperature >= trip_threshold) {
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throttle = true;
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trace_thermal_zone_trip(tz, trip_id, trip->type);
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}
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- dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",
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- trip_id, trip->type, trip_threshold, trend, throttle);
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+ hyst_temp = trip->temperature - trip->hysteresis;
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+
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+ dev_dbg(&tz->device,
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+ "Trip%d[type=%d,temp=%d,hyst=%d]:trend=%d,throttle=%d\n",
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+ trip_id, trip->type, trip->temperature, hyst_temp, trend, throttle);
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list_for_each_entry(instance, &td->thermal_instances, trip_node) {
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int old_target;
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old_target = instance->target;
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+ throttle = false;
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+ /*
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+ * Lower the mitigation only if the temperature
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+ * goes below the hysteresis temperature.
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+ */
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+ if (tz->temperature >= trip->temperature ||
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+ (tz->temperature >= hyst_temp &&
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+ old_target == instance->upper)) {
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+ throttle = true;
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+ trace_thermal_zone_trip(tz, trip_id, trip->type);
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+ }
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+
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instance->target = get_target_state(instance, trend, throttle);
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dev_dbg(&instance->cdev->device, "old_target=%d, target=%ld\n",
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