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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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52e8e59270
After adding cpufreq-dt support to Exynos542x, the Odroid XU3-Lite can be easily overheated when launching eight CPU-intensive tasks: thermal thermal_zone3: critical temperature reached(121 C),shutting down This seems to be specific to Odroid XU3-Lite board which officially supports lower frequencies than regular XU3 or XU4. When working at maximum CPU speed (1800 MHz big and 1300 MHz LITTLE) in warmer place for longer time, the fan fails to cool down the board and it reaches critical temperature. Add CPU cooling to Exynos5422/5800 to fix this issue. When reaching last interrupt-driven trip-point (70 degrees of Celsius) start passive cooling in polling mode (slowing CPU by 2 steps). When reaching 85 degrees of Celsius, start slowing even more, down to 600 MHz. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
104 lines
2.5 KiB
Plaintext
104 lines
2.5 KiB
Plaintext
/*
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* Device tree sources for Exynos5422 thermal zone
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*
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* Copyright (c) 2015 Lukasz Majewski <l.majewski@samsung.com>
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* Anand Moon <linux.amoon@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <dt-bindings/thermal/thermal.h>
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/ {
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thermal-zones {
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cpu0_thermal: cpu0-thermal {
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thermal-sensors = <&tmu_cpu0 0>;
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polling-delay-passive = <250>;
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polling-delay = <0>;
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trips {
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cpu_alert0: cpu-alert-0 {
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temperature = <50000>; /* millicelsius */
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hysteresis = <5000>; /* millicelsius */
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type = "active";
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};
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cpu_alert1: cpu-alert-1 {
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temperature = <60000>; /* millicelsius */
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hysteresis = <5000>; /* millicelsius */
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type = "active";
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};
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cpu_alert2: cpu-alert-2 {
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temperature = <70000>; /* millicelsius */
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hysteresis = <5000>; /* millicelsius */
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type = "active";
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};
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cpu_crit0: cpu-crit-0 {
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temperature = <120000>; /* millicelsius */
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hysteresis = <0>; /* millicelsius */
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type = "critical";
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};
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/*
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* Exyunos542x support only 4 trip-points
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* so for these polling mode is required.
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* Start polling at temperature level of last
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* interrupt-driven trip: cpu_alert2
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*/
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cpu_alert3: cpu-alert-3 {
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temperature = <70000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu_alert4: cpu-alert-4 {
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temperature = <85000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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};
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cooling-maps {
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map0 {
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trip = <&cpu_alert0>;
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cooling-device = <&fan0 0 1>;
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};
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map1 {
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trip = <&cpu_alert1>;
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cooling-device = <&fan0 1 2>;
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};
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map2 {
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trip = <&cpu_alert2>;
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cooling-device = <&fan0 2 3>;
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};
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/*
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* When reaching cpu_alert3, reduce CPU
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* by 2 steps. On Exynos5422/5800 that would
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* be: 1500 MHz and 1100 MHz.
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*/
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map3 {
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trip = <&cpu_alert3>;
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cooling-device = <&cpu0 0 2>;
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};
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map4 {
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trip = <&cpu_alert3>;
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cooling-device = <&cpu4 0 2>;
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};
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/*
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* When reaching cpu_alert4, reduce CPU
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* further, down to 600 MHz (11 steps for big,
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* 7 steps for LITTLE).
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*/
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map5 {
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trip = <&cpu_alert4>;
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cooling-device = <&cpu0 3 7>;
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};
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map6 {
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trip = <&cpu_alert4>;
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cooling-device = <&cpu4 3 11>;
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};
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};
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};
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};
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};
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