lkml.org 
[lkml]   [2019]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/3] ARM: dts: rockchip: Configure the GPU thermal zone for mickey
Date
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>
---
Changes in v2:
- specify all CPUs as cooling devices
- s/downstram/downstream/ in 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 | 67 ++++++++++++++++++++++
1 file changed, 67 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288-veyron-mickey.dts b/arch/arm/boot/dts/rk3288-veyron-mickey.dts
index 34797abe3403..945e80801292 100644
--- a/arch/arm/boot/dts/rk3288-veyron-mickey.dts
+++ b/arch/arm/boot/dts/rk3288-veyron-mickey.dts
@@ -136,6 +136,73 @@
};
};

+&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";
};
--
2.21.0.1020.gf2820cf01a-goog
\
 
 \ /
  Last update: 2019-05-21 00:01    [W:0.061 / U:0.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site