ARM: dts: rockchip: Use the GPU to cool CPU thermal zone of veyron mickey

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 <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm/boot/dts/rk3288-veyron-mickey.dts b/arch/arm/boot/dts/rk3288-veyron-mickey.dts
index 52f6abc22291d64c2aea78f3c1885f8a5b4deb95..34797abe340309ea77907be66d852d8e8083983f 100644 (file)
--- 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>;
+               };
        };
 };