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[01/11] ARM: dts: exynos: enable polling in Exynos 4210

Message ID 20230829091853.626011-2-m.majewski2@samsung.com
State Superseded
Headers show
Series [01/11] ARM: dts: exynos: enable polling in Exynos 4210 | expand

Commit Message

Mateusz Majewski Aug. 29, 2023, 9:18 a.m. UTC 
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@samsung.com>
---
 arch/arm/boot/dts/samsung/exynos4210.dtsi | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
diff mbox series

Patch

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 {