linux-kernel - Re: [PATCH v3] pmdomain: imx: gpcv2: Fix the imx8mm gpu hang due to wrong adb400 reset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <255e1946a67efadf13f468fc24c907074037a45e.camel@pengutronix.de>
Date: Mon, 26 Jan 2026 10:21:11 +0100
From: Lucas Stach <l.stach@...gutronix.de>
To: Fabio Estevam <festevam@...il.com>, Jacky Bai <ping.bai@....com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team
 <kernel@...gutronix.de>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 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 v3] pmdomain: imx: gpcv2: Fix the imx8mm gpu hang due to
 wrong adb400 reset

Am Samstag, dem 24.01.2026 um 18:20 -0300 schrieb Fabio Estevam:
> On Thu, Jan 22, 2026 at 11:51 PM Jacky Bai <ping.bai@....com> wrote:
> > 
> > On i.MX8MM, the GPUMIX, GPU2D, and GPU3D blocks share a common reset
> > domain. Due to this hardware limitation, powering off/on GPU2D or GPU3D
> > also triggers a reset of the GPUMIX domain, including its ADB400 port.
> > However, the ADB400 interface must always be placed into power‑down mode
> > before being reset.
> > 
> > Currently the GPUMIX and GPU2D/3D power domains rely on runtime PM to
> > handle dependency ordering. In some corner cases, the GPUMIX power off
> > sequence is skipped, leaving the ADB400 port active when GPU2D/3D reset.
> > This causes the GPUMIX ADB400 port to be reset while still active,
> > leading to unpredictable bus behavior and GPU hangs.
> > 
> > To avoid this, refine the power‑domain control logic so that the GPUMIX
> > ADB400 port is explicitly powered down and powered up as part of the GPU
> > power domain on/off sequence. This ensures proper ordering and prevents
> > incorrect ADB400 reset.
> > 
> > Suggested-by: Lucas Stach <l.stach@...gutronix.de>
> > Signed-off-by: Jacky Bai <ping.bai@....com>
> 
> Shouldn't this have a Fixes tag?

Yes, it needs to go into at least the active 6.12 LTS series, as the
patch changing the domain suspend ordering is in 6.10. Other than the
missing tags:

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

Regards,
Lucas