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ac783b419b
- Make step_wise thermal governor respect hysteresis This is done by importing a downstream patch, backporting the same feature now present in Linux v6.10+ would be too messy. - Introduce thermal zone for the WT61P803 uC (chassis and board sensors) - Introduce thermal zones for AQR NBase-T PHYs - No longer modify existing SoC thermal zones (which are now only in charge for emergency shutdown, and can be interrupt driven instead of polled) Signed-off-by: Daniel Golle <daniel@makrotopia.org> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
66 lines
2.5 KiB
Diff
66 lines
2.5 KiB
Diff
From 9685ce100f0d302501117113ef0a526ad1acca1d 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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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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[forward-ported for Linux 6.6, as stop-gap downstream solution]
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/thermal/gov_step_wise.c | 23 ++++++++++++++++-------
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1 file changed, 16 insertions(+), 7 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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@@ -86,22 +86,31 @@ static void thermal_zone_trip_update(str
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struct thermal_instance *instance;
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bool throttle = false;
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int old_target;
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+ int hyst_temp;
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trend = get_tz_trend(tz, trip_id);
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- if (tz->temperature >= trip->temperature) {
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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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- dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",
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- trip_id, trip->type, trip->temperature, trend, throttle);
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+ hyst_temp = trip->temperature - trip->hysteresis;
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+ dev_dbg(&tz->device, "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, &tz->thermal_instances, tz_node) {
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if (instance->trip != trip)
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continue;
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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 != THERMAL_NO_TARGET)) {
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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=%d\n",
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old_target, (int)instance->target);
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