linux-kernel - Re: [PATCH v2] arm64: dts: allwinner: a64: Add GPU thermal trips to the SoC dtsi

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Message-Id: <172546181728.1883804.16312630644940365957.b4-ty@csie.org>
Date: Wed, 04 Sep 2024 22:56:57 +0800
From: Chen-Yu Tsai <wens@...e.org>
To: linux-sunxi@...ts.linux.dev, Dragan Simic <dsimic@...jaro.org>
Cc: jernej.skrabec@...il.com, samuel@...lland.org, 
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
 linux-kernel@...r.kernel.org, uwu@...nowy.me, wenst@...omium.org, 
 broonie@...nel.org, daniel.lezcano@...aro.org
Subject: Re: [PATCH v2] arm64: dts: allwinner: a64: Add GPU thermal trips
 to the SoC dtsi

On Tue, 20 Aug 2024 05:57:47 +0200, Dragan Simic wrote:
> Add thermal trips for the two GPU thermal sensors found in the Allwinner A64.
> There's only one GPU OPP defined since the commit 1428f0c19f9c ("arm64: dts:
> allwinner: a64: Run GPU at 432 MHz"), so defining only the critical thermal
> trips makes sense for the A64's two GPU thermal zones.
> 
> Having these critical thermal trips defined ensures that no hot spots develop
> inside the SoC die that exceed the maximum junction temperature.  That might
> have been possible before, although quite unlikely, because the CPU and GPU
> portions of the SoC are packed closely inside the SoC, so the overheating GPU
> would inevitably result in the heat soaking into the CPU portion of the SoC,
> causing the CPU thermal sensor to return high readings and trigger the CPU
> critical thermal trips.  However, it's better not to rely on the heat soak
> and have the critical GPU thermal trips properly defined instead.
> 
> [...]

Applied to sunxi/for-next in sunxi/linux.git, thanks!

[1/1] arm64: dts: allwinner: a64: Add GPU thermal trips to the SoC dtsi
      https://git.kernel.org/sunxi/linux/c/89f1a037e97c

Best regards,
-- 
Chen-Yu Tsai <wens@...e.org>