On rk3288 the CPU and GPU temperatures are correlated. Limit the GPU frequency on veyron mickey to 400 MHz for CPU temperatures >= 65°C and to 300 MHz for CPU temperatures >= 85°C.
This matches the configuration of the downstream Chrome OS 3.14 kernel, the 'official' kernel for mickey. Signed-off-by: Matthias Kaehlcke <m...@chromium.org> --- Changes in v2: - added 'cpu_warm_limit_gpu' to throttle GPU for T.cpu >= 65°C - removed comment saying that GPU isn't throttled beyond 400 MHz based on CPU temperature - updated commit message Note: this patch depends on "ARM: dts: rockchip: Add #cooling-cells entry for rk3288 GPU" (https://lore.kernel.org/patchwork/patch/1075005/) --- arch/arm/boot/dts/rk3288-veyron-mickey.dts | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/arch/arm/boot/dts/rk3288-veyron-mickey.dts b/arch/arm/boot/dts/rk3288-veyron-mickey.dts index 52f6abc22291..34797abe3403 100644 --- a/arch/arm/boot/dts/rk3288-veyron-mickey.dts +++ b/arch/arm/boot/dts/rk3288-veyron-mickey.dts @@ -75,9 +75,7 @@ cooling-maps { /* * After 1st level, throttle the CPU down to as low as 1.4 GHz - * and don't let the GPU go faster than 400 MHz. Note that we - * won't throttle the GPU lower than 400 MHz due to CPU - * heat--we'll let the GPU do the rest itself. + * and don't let the GPU go faster than 400 MHz. */ cpu_warm_limit_cpu { trip = <&cpu_alert_warm>; @@ -86,6 +84,10 @@ <&cpu2 THERMAL_NO_LIMIT 4>, <&cpu3 THERMAL_NO_LIMIT 4>; }; + cpu_warm_limit_gpu { + trip = <&cpu_alert_warm>; + cooling-device = <&gpu 1 1>; + }; /* * Add some discrete steps to help throttling system deal @@ -125,6 +127,12 @@ <&cpu2 8 THERMAL_NO_LIMIT>, <&cpu3 8 THERMAL_NO_LIMIT>; }; + + /* At very hot, don't let GPU go over 300 MHz */ + cpu_very_hot_limit_gpu { + trip = <&cpu_alert_very_hot>; + cooling-device = <&gpu 2 2>; + }; }; }; -- 2.21.0.1020.gf2820cf01a-goog
