diff mbox series

[v5,3/3] ARM: dts: sun8i-r40: Add thermal trip points/cooling maps

Message ID 20220517013607.2252-4-qianfanguijin@163.com
State New
Headers show
Series ARM: sun8i-r40: CPU improve | expand

Commit Message

qianfan May 17, 2022, 1:36 a.m. UTC 
From: qianfan Zhao <qianfanguijin@163.com>

For the trip points, I used values from the BSP code.

The critical trip point value is 30°C above the maximum recommended
ambient temperature (85°C) for the SoC from the datasheet, so there's
some headroom even at such a high ambient temperature.

Signed-off-by: qianfan Zhao <qianfanguijin@163.com>
---
 arch/arm/boot/dts/sun8i-r40.dtsi | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

Comments

Samuel Holland July 5, 2022, 5:07 a.m. UTC | #1 
On 5/16/22 8:36 PM, qianfanguijin@163.com wrote:
> From: qianfan Zhao <qianfanguijin@163.com>
> 
> For the trip points, I used values from the BSP code.
> 
> The critical trip point value is 30°C above the maximum recommended
> ambient temperature (85°C) for the SoC from the datasheet, so there's
> some headroom even at such a high ambient temperature.
> 
> Signed-off-by: qianfan Zhao <qianfanguijin@163.com>

Reviewed-by: Samuel Holland <samuel@sholland.org>
Tested-by: Samuel Holland <samuel@sholland.org>

which took quite a while to hit the passive trip point:

# cat /sys/class/thermal/cooling_device0/stats/time_in_state_ms
state0  1374892
state1  1499
state2  0
state3  0
state4  0
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi
index ae2a5ebd9924..b43f3f72a915 100644
--- a/arch/arm/boot/dts/sun8i-r40.dtsi
+++ b/arch/arm/boot/dts/sun8i-r40.dtsi
@@ -86,6 +86,7 @@  cpu0: cpu@0 {
 			reg = <0>;
 			clocks = <&ccu CLK_CPU>;
 			clock-names = "cpu";
+			#cooling-cells = <2>;
 		};
 
 		cpu1: cpu@1 {
@@ -94,6 +95,7 @@  cpu1: cpu@1 {
 			reg = <1>;
 			clocks = <&ccu CLK_CPU>;
 			clock-names = "cpu";
+			#cooling-cells = <2>;
 		};
 
 		cpu2: cpu@2 {
@@ -102,6 +104,7 @@  cpu2: cpu@2 {
 			reg = <2>;
 			clocks = <&ccu CLK_CPU>;
 			clock-names = "cpu";
+			#cooling-cells = <2>;
 		};
 
 		cpu3: cpu@3 {
@@ -110,6 +113,7 @@  cpu3: cpu@3 {
 			reg = <3>;
 			clocks = <&ccu CLK_CPU>;
 			clock-names = "cpu";
+			#cooling-cells = <2>;
 		};
 	};
 
@@ -125,6 +129,30 @@  cpu_thermal: cpu0-thermal {
 			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			thermal-sensors = <&ths 0>;
+
+			trips {
+				cpu_hot_trip: cpu-hot {
+					temperature = <80000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+
+				cpu_very_hot_trip: cpu-very-hot {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				cpu-hot-limit {
+					trip = <&cpu_hot_trip>;
+					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>;
+				};
+			};
 		};
 
 		gpu_thermal: gpu-thermal {