linux-kernel - Re: [PATCH] drm/mediatek: Disable AFBC support on Mediatek DRM driver

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

Message-ID: <CAPj87rPTKv=qv_fHTVvymNmi=nZHyxW-PgR1EFQE7T8gV1pNzg@mail.gmail.com>
Date: Mon, 27 Oct 2025 09:51:05 +0000
From: Daniel Stone <daniel@...ishbar.org>
To: "Ariel D'Alessandro" <ariel.dalessandro@...labora.com>
Cc: chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...il.com, 
	simona@...ll.ch, matthias.bgg@...il.com, 
	angelogioacchino.delregno@...labora.com, greenjustin@...omium.org, 
	sjoerd@...labora.com, dri-devel@...ts.freedesktop.org, 
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH] drm/mediatek: Disable AFBC support on Mediatek DRM driver

On Fri, 24 Oct 2025 at 21:28, Ariel D'Alessandro
<ariel.dalessandro@...labora.com> wrote:
> Commit c410fa9b07c32 ("drm/mediatek: Add AFBC support to Mediatek DRM
> driver") added AFBC support to Mediatek DRM and enabled the
> 32x8/split/sparse modifier.
>
> However, this is currently broken on Mediatek MT8188 (Genio 700 EVK
> platform); tested using upstream Kernel and Mesa (v25.2.1), AFBC is used by
> default since Mesa v25.0.
>
> Kernel trace reports vblank timeouts constantly, and the render is garbled:

Reviewed-by: Daniel Stone <daniels@...labora.com>

This is definitely the right thing to do until we can figure out why
the DRM driver doesn't like the GPU's images, and how we can get it
fixed in either DRM or Mesa.

Cheers,
Daniel