linux-kernel - [PATCH 02/12] arm64: dts: qcom: sc8280xp: Throttle the GPU when overheating

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Message-Id: <20240510-topic-gpus_are_cool_now-v1-2-ababc269a438@linaro.org>
Date: Fri, 10 May 2024 14:58:31 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Johan Hovold <johan+linaro@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Bjorn Andersson <quic_bjorande@...cinc.com>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 02/12] arm64: dts: qcom: sc8280xp: Throttle the GPU when
 overheating

Add an 85C passive trip point with 1C of hysteresis to ensure the
thermal framework takes sufficient action to prevent reaching junction
temperature. Also, add passive polling to ensure more than one
temperature change event is recorded.

Fixes: 014bbc990e27 ("arm64: dts: qcom: sc8280xp: Introduce additional tsens instances")
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
index f63951186a5b..65c444cce00c 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
@@ -5956,10 +5956,25 @@ cpu-crit {
 		};
 
 		gpu-thermal {
+			polling-delay-passive = <250>;
+
 			thermal-sensors = <&tsens2 2>;
 
+			cooling-maps {
+				map0 {
+					trip = <&gpu_alert0>;
+					cooling-device = <&gpu THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+
 			trips {
-				gpu-crit {
+				gpu_alert0: trip-point0 {
+					temperature = <85000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+
+				trip-point1 {
 					temperature = <110000>;
 					hysteresis = <1000>;
 					type = "critical";

-- 
2.40.1