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

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Message-ID:
 <VE1PR04MB7213F68C050F5E9486FCE2FB8788A@VE1PR04MB7213.eurprd04.prod.outlook.com>
Date: Mon, 19 Jan 2026 10:04:35 +0000
From: Jacky Bai <ping.bai@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>, 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" <linux-pm@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>
Subject: RE: [PATCH 1/2] Fix the imx8mm gpu hang due to adb400 reset wrongly

> 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:

Yes, the prefix should be added. Thank you to point out this problem. Missed when cleanup the patch, will fix it in V2. 

BR
Jacky Bai
> 
> Best regards,
> Krzysztof