linux-kernel - [PATCH] arm64: dts: allwinner: a64: Add thermal trip points for GPU

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Date:   Mon,  5 Jun 2023 04:58:08 +0100
From:   Alexey Klimov <alexey.klimov@...aro.org>
To:     linux-sunxi@...ts.linux.dev
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, wens@...e.org,
        jernej.skrabec@...il.com, samuel@...lland.org,
        daniel.lezcano@...aro.org, peter.griffin@...aro.org,
        klimov.linux@...il.com
Subject: [PATCH] arm64: dts: allwinner: a64: Add thermal trip points for GPU

Without trip points for GPU, the following errors are printed in the
dmesg log and the sun8i-thermal driver fails to load:

thermal_sys: Failed to find 'trips' node
thermal_sys: Failed to find trip points for thermal-sensor id=1
sun8i-thermal: probe of 1c25000.thermal-sensor failed with error -22

When thermal zones are defined, trip points definitions are mandatory.
Trip values for the GPU are assumed to be the same values as the CPU
ones. The available specs do not provide any hints about thermal regimes
for the GPU and it seems GPU is implemented on the same die as the CPU.

Tested on Pine a64+.

Cc: Samuel Holland <samuel@...lland.org>
Cc: Jernej Skrabec <jernej.skrabec@...il.com>
Cc: Chen-Yu Tsai <wens@...e.org>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: devicetree@...r.kernel.org
Signed-off-by: Alexey Klimov <alexey.klimov@...aro.org>
---
 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 62f45f71ec65..07963eea1bf0 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -243,6 +243,29 @@ gpu0_thermal: gpu0-thermal {
 			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			thermal-sensors = <&ths 1>;
+
+			trips {
+				gpu0_alert0: gpu0_alert0 {
+					/* milliCelsius */
+					temperature = <75000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+
+				gpu0_alert1: gpu0_alert1 {
+					/* milliCelsius */
+					temperature = <90000>;
+					hysteresis = <2000>;
+					type = "hot";
+				};
+
+				gpu0_crit: gpu0_crit {
+					/* milliCelsius */
+					temperature = <110000>;
+					hysteresis = <2000>;
+					type = "critical";
+				};
+			};
 		};
 
 		gpu1_thermal: gpu1-thermal {
@@ -250,6 +273,29 @@ gpu1_thermal: gpu1-thermal {
 			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			thermal-sensors = <&ths 2>;
+
+			trips {
+				gpu1_alert0: gpu1_alert0 {
+					/* milliCelsius */
+					temperature = <75000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+
+				gpu1_alert1: gpu1_alert1 {
+					/* milliCelsius */
+					temperature = <90000>;
+					hysteresis = <2000>;
+					type = "hot";
+				};
+
+				gpu1_crit: gpu1_crit {
+					/* milliCelsius */
+					temperature = <110000>;
+					hysteresis = <2000>;
+					type = "critical";
+				};
+			};
 		};
 	};
 
-- 
2.40.1