diff mbox series

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

Message ID 20230829091853.626011-2-m.majewski2@samsung.com (mailing list archive)
State New
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(-)

Comments

Krzysztof Kozlowski Aug. 29, 2023, 9:26 a.m. UTC | #1
On 29/08/2023 11:18, Mateusz Majewski wrote:
> 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 ++++++++--

Please split unrelated patches for different subsystems into separate
patchsets.

>  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.

Linux coding style comments are:

/*
 * Foo bar


Best regards,
Krzysztof
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 {