linux-kernel - [PATCH v2] ARM: dts: exynos: disable polling in Odroid XU3-related devices

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Message-ID: <20240116140839.1029395-1-m.majewski2@samsung.com>
Date: Tue, 16 Jan 2024 15:08:39 +0100
From: Mateusz Majewski <m.majewski2@...sung.com>
To: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Mateusz Majewski <m.majewski2@...sung.com>, Rob Herring
	<robh+dt@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>, Marek Szyprowski
	<m.szyprowski@...sung.com>
Subject: [PATCH v2] ARM: dts: exynos: disable polling in Odroid XU3-related
 devices

After having switched to dynamic trip points, we no longer have a
hardware limit for trip point count and can support as many as we want
without polling.

Signed-off-by: Mateusz Majewski <m.majewski2@...sung.com>
---
v1 -> v2: Just resubmitting as a single patch, originally submitted with
  patches for the thermal subsystem back when I did not realize that I
  should not do this. The patches for thermal subsystem are merged and
  will hopefully land in 6.8, so I understand that it's ok to submit
  this right now...?

 .../dts/samsung/exynos5422-odroidxu3-common.dtsi | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/arch/arm/boot/dts/samsung/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/samsung/exynos5422-odroidxu3-common.dtsi
index b4a851aa8881..4a4c55a4beb3 100644
--- a/arch/arm/boot/dts/samsung/exynos5422-odroidxu3-common.dtsi
+++ b/arch/arm/boot/dts/samsung/exynos5422-odroidxu3-common.dtsi
@@ -55,7 +55,7 @@ fan0: pwm-fan {
 	thermal-zones {
 		cpu0_thermal: cpu0-thermal {
 			thermal-sensors = <&tmu_cpu0>;
-			polling-delay-passive = <250>;
+			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			trips {
 				cpu0_alert0: cpu-alert-0 {
@@ -78,12 +78,6 @@ cpu0_crit0: cpu-crit-0 {
 					hysteresis = <0>; /* millicelsius */
 					type = "critical";
 				};
-				/*
-				 * Exynos542x supports only 4 trip-points
-				 * so for these polling mode is required.
-				 * Start polling at temperature level of last
-				 * interrupt-driven trip: cpu0_alert2
-				 */
 				cpu0_alert3: cpu-alert-3 {
 					temperature = <70000>; /* millicelsius */
 					hysteresis = <10000>; /* millicelsius */
@@ -144,7 +138,7 @@ cpu0_cooling_map4: map4 {
 		};
 		cpu1_thermal: cpu1-thermal {
 			thermal-sensors = <&tmu_cpu1>;
-			polling-delay-passive = <250>;
+			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			trips {
 				cpu1_alert0: cpu-alert-0 {
@@ -217,7 +211,7 @@ cpu1_cooling_map4: map4 {
 		};
 		cpu2_thermal: cpu2-thermal {
 			thermal-sensors = <&tmu_cpu2>;
-			polling-delay-passive = <250>;
+			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			trips {
 				cpu2_alert0: cpu-alert-0 {
@@ -290,7 +284,7 @@ cpu2_cooling_map4: map4 {
 		};
 		cpu3_thermal: cpu3-thermal {
 			thermal-sensors = <&tmu_cpu3>;
-			polling-delay-passive = <250>;
+			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			trips {
 				cpu3_alert0: cpu-alert-0 {
@@ -363,7 +357,7 @@ cpu3_cooling_map4: map4 {
 		};
 		gpu_thermal: gpu-thermal {
 			thermal-sensors = <&tmu_gpu>;
-			polling-delay-passive = <250>;
+			polling-delay-passive = <0>;
 			polling-delay = <0>;
 			trips {
 				gpu_alert0: gpu-alert-0 {
-- 
2.42.0