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ARM: tegra: nexus7: Improve thermal zones

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Use skin temperature for maintaining temperature that is suitable
specifically for Nexus 7. 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 00:19:47 +03:00
committed by Thierry Reding
parent 3f9c8c113f
commit 2af8d585c3
1 changed files with 52 additions and 4 deletions
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56
arch/arm/boot/dts/tegra30-asus-nexus7-grouper-common.dtsi
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@@ -1255,21 +1255,34 @@
}; };
thermal-zones { thermal-zones {
cpu-thermal { /*
* NCT72 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 Nexus 7
* from getting too hot from a user's tactile perspective.
* The CPU zone is intended to protect silicon from damage.
*/
skin-thermal {
polling-delay-passive = <1000>; /* milliseconds */ polling-delay-passive = <1000>; /* milliseconds */
polling-delay = <5000>; /* milliseconds */ polling-delay = <5000>; /* milliseconds */
thermal-sensors = <&nct72 1>; thermal-sensors = <&nct72 0>;
trips { trips {
trip0: cpu-alert0 { trip0: skin-alert {
/* throttle at 57C until temperature drops to 56.8C */ /* throttle at 57C until temperature drops to 56.8C */
temperature = <57000>; temperature = <57000>;
hysteresis = <200>; hysteresis = <200>;
type = "passive"; type = "passive";
}; };
trip1: cpu-crit { trip1: skin-crit {
/* shut down at 65C */ /* shut down at 65C */
temperature = <65000>; temperature = <65000>;
hysteresis = <2000>; hysteresis = <2000>;
@@ -1289,5 +1302,40 @@
}; };
}; };
}; };
cpu-thermal {
polling-delay-passive = <1000>; /* milliseconds */
polling-delay = <5000>; /* milliseconds */
thermal-sensors = <&nct72 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>,
<&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&actmon THERMAL_NO_LIMIT
THERMAL_NO_LIMIT>;
};
};
};
}; };
}; };