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ARM: dts: rockchip: Configure the GPU thermal zone for mickey

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mickey crams a lot of hardware into a tiny package, which requires
more aggressive thermal throttling than for devices with a larger
footprint. Configure the GPU thermal zone to throttle the GPU
progressively at temperatures >= 60°C. Heat dissipated by the
CPUs also affects the GPU temperature, hence we cap the CPU
frequency to 1.4 GHz for temperatures above 65°C. Further throttling
of the CPUs may be performed by the CPU thermal zone.

The configuration matches that of the downstream Chrome OS 3.14
kernel, the 'official' kernel for mickey.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Matthias Kaehlcke 2019-05-20 15:00:51 -07:00 committed by Heiko Stuebner
parent 11983d8530
commit c87efcc3d1
1 changed files with 67 additions and 0 deletions
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67
arch/arm/boot/dts/rk3288-veyron-mickey.dts
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@ -136,6 +136,73 @@ cpu_very_hot_limit_gpu {
};
};
&gpu_thermal {
/delete-node/ trips;
/delete-node/ cooling-maps;
trips {
gpu_alert_warmish: gpu_alert_warmish {
temperature = <60000>; /* millicelsius */
hysteresis = <2000>; /* millicelsius */
type = "passive";
};
gpu_alert_warm: gpu_alert_warm {
temperature = <65000>; /* millicelsius */
hysteresis = <2000>; /* millicelsius */
type = "passive";
};
gpu_alert_hotter: gpu_alert_hotter {
temperature = <84000>; /* millicelsius */
hysteresis = <2000>; /* millicelsius */
type = "passive";
};
gpu_alert_very_very_hot: gpu_alert_very_very_hot {
temperature = <86000>; /* millicelsius */
hysteresis = <2000>; /* millicelsius */
type = "passive";
};
gpu_crit: gpu_crit {
temperature = <90000>; /* millicelsius */
hysteresis = <2000>; /* millicelsius */
type = "critical";
};
};
cooling-maps {
/* After 1st level throttle the GPU down to as low as 400 MHz */
gpu_warmish_limit_gpu {
trip = <&gpu_alert_warmish>;
cooling-device = <&gpu THERMAL_NO_LIMIT 1>;
};
/*
* Slightly after we throttle the GPU, we'll also make sure that
* the CPU can't go faster than 1.4 GHz. Note that we won't
* throttle the CPU lower than 1.4 GHz due to GPU heat--we'll
* let the CPU do the rest itself.
*/
gpu_warm_limit_cpu {
trip = <&gpu_alert_warm>;
cooling-device = <&cpu0 4 4>,
<&cpu1 4 4>,
<&cpu2 4 4>,
<&cpu3 4 4>;
};
/* When hot, GPU goes down to 300 MHz */
gpu_hotter_limit_gpu {
trip = <&gpu_alert_hotter>;
cooling-device = <&gpu 2 2>;
};
/* When really hot, don't let GPU go _above_ 300 MHz */
gpu_very_very_hot_limit_gpu {
trip = <&gpu_alert_very_very_hot>;
cooling-device = <&gpu 2 THERMAL_NO_LIMIT>;
};
};
};
&i2c2 {
status = "disabled";
};