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ARM: tegra: acer-a500: Improve thermal zones

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Use skin temperature for maintaining temperature that is suitable
specifically for A500. Add CPU thermal zone that protects silicon.
All these changes don't make a significant difference, but it is a
more correct definition of thermal zones.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko
2021-08-03 00:19:46 +03:00
committed by Thierry Reding
parent c60e6e9818
commit 3f9c8c113f
1 changed files with 47 additions and 10 deletions
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57
arch/arm/boot/dts/tegra20-acer-a500-picasso.dts
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@@ -1029,28 +1029,34 @@
}; };
thermal-zones { thermal-zones {
/*
* NCT1008 has two sensors:
*
* 0: internal that monitors ambient/skin temperature
* 1: external that is connected to the CPU's diode
*
* Ideally we should use userspace thermal governor,
* but it's a much more complex solution. The "skin"
* zone is a simpler solution which prevents A500 from
* getting too hot from a user's tactile perspective.
* The CPU zone is intended to protect silicon from damage.
*/
skin-thermal { skin-thermal {
polling-delay-passive = <1000>; /* milliseconds */
polling-delay = <0>; /* milliseconds */
thermal-sensors = <&nct1008 0>;
};
cpu-thermal {
polling-delay-passive = <1000>; /* milliseconds */ polling-delay-passive = <1000>; /* milliseconds */
polling-delay = <5000>; /* milliseconds */ polling-delay = <5000>; /* milliseconds */
thermal-sensors = <&nct1008 1>; thermal-sensors = <&nct1008 0>;
trips { trips {
trip0: cpu-alert0 { trip0: skin-alert {
/* start throttling at 60C */ /* start throttling at 60C */
temperature = <60000>; temperature = <60000>;
hysteresis = <200>; hysteresis = <200>;
type = "passive"; type = "passive";
}; };
trip1: cpu-crit { trip1: skin-crit {
/* shut down at 70C */ /* shut down at 70C */
temperature = <70000>; temperature = <70000>;
hysteresis = <2000>; hysteresis = <2000>;
@@ -1066,6 +1072,37 @@
}; };
}; };
}; };
cpu-thermal {
polling-delay-passive = <1000>; /* milliseconds */
polling-delay = <5000>; /* milliseconds */
thermal-sensors = <&nct1008 1>;
trips {
trip2: cpu-alert {
/* throttle at 85C until temperature drops to 84.8C */
temperature = <85000>;
hysteresis = <200>;
type = "passive";
};
trip3: cpu-crit {
/* shut down at 90C */
temperature = <90000>;
hysteresis = <2000>;
type = "critical";
};
};
cooling-maps {
map1 {
trip = <&trip2>;
cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
};
};
};
}; };
memory-controller@7000f400 { memory-controller@7000f400 {