linux-kernel - [PATCH v3 10/11] ARM: sun8i: a33: Add devfreq-based GPU cooling

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Message-Id: <20170321153611.16228-11-quentin.schulz@free-electrons.com>
Date:   Tue, 21 Mar 2017 16:36:10 +0100
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     dmitry.torokhov@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, maxime.ripard@...e-electrons.com,
        wens@...e.org, lee.jones@...aro.org, linux@...linux.org.uk,
        jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net
Cc:     thomas.petazzoni@...e-electrons.com, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-sunxi@...glegroups.com, icenowy@...c.xyz,
        Quentin Schulz <quentin.schulz@...e-electrons.com>
Subject: [PATCH v3 10/11] ARM: sun8i: a33: Add devfreq-based GPU cooling

From: Maxime Ripard <maxime.ripard@...e-electrons.com>

This adds GPU thermal throttling for the Allwinner A33.

Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
---

v3:
  - got rid of cooling-min-level and cooling-max-level as it's not used in any
  code in the kernel,

added in v2

 arch/arm/boot/dts/sun8i-a23-a33.dtsi |  1 +
 arch/arm/boot/dts/sun8i-a33.dtsi     | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-a23-a33.dtsi b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
index 5e8725d..6d81a6d 100644
--- a/arch/arm/boot/dts/sun8i-a23-a33.dtsi
+++ b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
@@ -495,6 +495,7 @@
 
 			assigned-clocks = <&ccu CLK_GPU>;
 			assigned-clock-rates = <384000000>;
+			#cooling-cells = <2>;
 		};
 
 		gic: interrupt-controller@...81000 {
diff --git a/arch/arm/boot/dts/sun8i-a33.dtsi b/arch/arm/boot/dts/sun8i-a33.dtsi
index 73552bb..a2c6077 100644
--- a/arch/arm/boot/dts/sun8i-a33.dtsi
+++ b/arch/arm/boot/dts/sun8i-a33.dtsi
@@ -188,6 +188,16 @@
 					trip = <&cpu_alert1>;
 					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
 				};
+
+				map2 {
+					trip = <&gpu_alert0>;
+					cooling-device = <&mali 1 THERMAL_NO_LIMIT>;
+				};
+
+				map3 {
+					trip = <&gpu_alert1>;
+					cooling-device = <&mali 2 THERMAL_NO_LIMIT>;
+				};
 			};
 
 			trips {
@@ -198,6 +208,13 @@
 					type = "passive";
 				};
 
+				gpu_alert0: gpu_alert0 {
+					/* milliCelsius */
+					temperature = <85000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+
 				cpu_alert1: cpu_alert1 {
 					/* milliCelsius */
 					temperature = <90000>;
@@ -205,6 +222,13 @@
 					type = "hot";
 				};
 
+				gpu_alert1: gpu_alert1 {
+					/* milliCelsius */
+					temperature = <95000>;
+					hysteresis = <2000>;
+					type = "hot";
+				};
+
 				cpu_crit: cpu_crit {
 					/* milliCelsius */
 					temperature = <110000>;
-- 
2.9.3