linux-kernel - Re: [PATCH] arm64: dts: imx8mp: Enable gpu passive throttling

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Message-ID: <aElJaVxqUUNi1rfC@dragon>
Date: Wed, 11 Jun 2025 17:16:25 +0800
From: Shawn Guo <shawnguo2@...h.net>
To: Martin Kepplinger-Novaković <martink@...teo.de>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: imx8mp: Enable gpu passive throttling

On Thu, May 08, 2025 at 10:18:02AM +0000, Martin Kepplinger-Novaković wrote:
> Hook up the gpu as a passive cooling device to the thermal zones' alert
> trip point just like the cpu.
> 
> The gpu here consists of 3D GPU, 2D GPU and NPU.
> 
> One way to test would be to set one "alert" trip point low enough
> and watch the cooling device state increase:
> 
> echo 10000 > /sys/class/thermal/thermal_zone0/trip_point_0_temp
> watch cat /sys/class/thermal/cooling_device*/cur_state
> 
> And of course set the trip point back to its original value and watch
> the cooling device states jump to 0 again.
> 
> Signed-off-by: Martin Kepplinger-Novaković <martink@...teo.de>

Applied, thanks!