linux-kernel - Re: [PATCH 1/2] Fix the imx8mm gpu hang due to adb400 reset wrongly

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Message-ID: <295b7b13-b44e-429a-b410-f1e80bb46e95@kernel.org>
Date: Mon, 19 Jan 2026 10:20:45 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jacky Bai <ping.bai@....com>, Ulf Hansson <ulf.hansson@...aro.org>,
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-pm@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] Fix the imx8mm gpu hang due to adb400 reset wrongly

On 19/01/2026 09:53, Jacky Bai wrote:
> Due to the HW limitation on i.MX8MM, the gpumix, gpu2d and
> gpu3d share the same reset domain, that means when gpu2d/3d
> go through the power off/on cycle, the gpu2d/3d reset will
> also reset the gpumix domain, The GPUMIX ADB400 port also be
> reset. But the ADB400 must be put into power down before reset
> it.
> 
> currently, gpumix, gpu2d/3d power domain use the pm runtime_pm
> to handle these power domain dependency, but in some corner case,
> the gpumix power off will be skipped, then the ADB400 port will
> be in active while gpu2d/3d doing the reset. The GPUMIX the ADB400
> port will be reset wrongly, so lead to unpredictable bus behavior.
> 
> To simplify these domain on/off order & dependency, refine the
> code to directly handle GPUMIX domain on/off along with the
> gpu2d/3d power on/off flow.
> 
> Signed-off-by: Jacky Bai <ping.bai@....com>
> ---

Please use subject prefixes matching the subsystem. You can get them for
example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
your patch is touching. For bindings, the preferred subjects are
explained here:
https://www.kernel.org/doc/html/latest/devicetree/bindings/submitting-patches.html#i-for-patch-submitters

Best regards,
Krzysztof