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Message-ID: <20230829091853.626011-2-m.majewski2@samsung.com>
Date: Tue, 29 Aug 2023 11:18:39 +0200
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,
linux-pm@...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>,
Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCH 01/11] ARM: dts: exynos: enable polling in Exynos 4210
It seems that thermal in Exynos 4210 is broken without this, as it will
never decrease cooling after increasing it.
Signed-off-by: Mateusz Majewski <m.majewski2@...sung.com>
---
arch/arm/boot/dts/samsung/exynos4210.dtsi | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/arm/boot/dts/samsung/exynos4210.dtsi b/arch/arm/boot/dts/samsung/exynos4210.dtsi
index 0e27c3375e2e..aae185b7f91c 100644
--- a/arch/arm/boot/dts/samsung/exynos4210.dtsi
+++ b/arch/arm/boot/dts/samsung/exynos4210.dtsi
@@ -391,8 +391,14 @@ &cpu_alert2 {
};
&cpu_thermal {
- polling-delay-passive = <0>;
- polling-delay = <0>;
+ /* Exynos 4210 supports thermal interrupts, but only for the rising threshold.
+ * This means that polling is not needed for preventing overheating, but only
+ * for decreasing cooling when possible. Hence we poll with a high delay.
+ * Ideally, we would disable polling for the first trip point, but this isn't
+ * really possible without outrageous hacks.
+ */
+ polling-delay-passive = <5000>;
+ polling-delay = <5000>;
};
&gic {
--
2.41.0
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