linux-kernel - Re: [PATCH 0/3] drm: zynqmp: Make the video plane primary

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: <24a9a9a2-ba7c-4619-96dc-4355d850561b@linux.dev>
Date: Fri, 14 Nov 2025 10:35:10 -0500
From: Sean Anderson <sean.anderson@...ux.dev>
To: Thomas Zimmermann <tzimmermann@...e.de>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, Mike Looijmans <mike.looijmans@...ic.nl>,
 David Airlie <airlied@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Anatoliy Klymenko <anatoliy.klymenko@....com>,
 Maxime Ripard <mripard@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 Simona Vetter <simona@...ll.ch>, Michal Simek <michal.simek@....com>
Subject: Re: [PATCH 0/3] drm: zynqmp: Make the video plane primary

Hi Thomas,

On 11/14/25 02:42, Thomas Zimmermann wrote:
> Hi
> 
> Am 13.11.25 um 21:37 schrieb Sean Anderson:
>> The graphics plane does not support XRGB8888, which is the default mode
>> X uses for 24-bit color. Because of this, X must be set to use 16-bit
>> color, which has a measurable performance penalty. Make the video plane
>> the primary plane as it natively supports XRGB8888. An alternative
>> approach to add XRGB8888 to the graphics plane is discussed in [1], as
>> well as in patch 2.
> 
> Did you try to set drm_device.mode_config.preferred_depth = 16, like at [1]?  IIRC user space looks at this value to auto-detect the color format.

I have not tried that. But I would rather use 24-bit color for the performance boost.

--Sean