linux-kernel - Re: [PATCH v2 0/2] Add "pixel_encoding" to switch between RGB & YUV color modes

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Message-ID: <aK1hPoCmLziaPPOd@xpredator>
Date: Tue, 26 Aug 2025 10:24:46 +0300
From: Marius Vlad <marius.vlad@...labora.com>
To: Shengyu Qu <wiagn233@...look.com>
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Subject: Re: [PATCH v2 0/2] Add "pixel_encoding" to switch between RGB & YUV
 color modes

Hi,

Prior work towards this is/was: https://lore.kernel.org/dri-devel/20240115160554.720247-1-andri@yngvason.is/

I have slightly modified version of that, but still working on
getting another driver (besides amd/i915) working with it.

On Tue, Aug 26, 2025 at 02:39:59AM +0800, Shengyu Qu wrote:
> Usage:
>  - X11: xrandr --output <output name> --set "pixel encoding" <encoding>
>  - Wayland: proptest -M amdgpu -D <card path> <connector ID> connector
>    <pixel encoding ID> <encoding (ID)>
>  - Kernel Param: amdgpu.pixel_encoding=<encoding>
>    or amdgpu.pixel_encoding=<monitor>:<encoding>,<monitor>:<encoding>
> 
> Supported encodings are: "auto" (0) (Default and original behavior), "rgb"
> (1), "ycbcr444" (2), "ycbcr422" (4), and "ycbcr420" (8).
> 
> This patch series allow users to switch between pixel encodings, which is
> specially important when auto gets it wrong (probably because of monitor's
> manufacturer mistake) and needs user intervention.
> 
> Changes since v1:
>  - Some cleanup and rebase
>  - Added YUV422 support
> 
> Full discussion:
> https://gitlab.freedesktop.org/drm/amd/-/issues/476#note_2628536
> 
> Original patch by Yassine Imounachen, current version is modified based on
> this patch(was rebased by Rafael Carvalho):
> https://lists.freedesktop.org/archives/amd-gfx/2024-October/116195.html
> 
> Shengyu Qu (2):
>   drm/connector: Add "pixel_encoding" to switch between RGB & YUV color
>     output modes
>   drm/amdgpu: Add "pixel_encoding" DRM connector property support for
>     amdgpu
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_display.c   |  36 +++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_display.h   |   3 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h      |   2 +
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 273 +++++++++++++++++-
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |   1 +
>  drivers/gpu/drm/amd/display/dc/core/dc.c      |   8 +
>  drivers/gpu/drm/amd/display/dc/dc_stream.h    |   2 +
>  drivers/gpu/drm/drm_modes.c                   |  32 ++
>  include/drm/drm_connector.h                   |   7 +
>  9 files changed, 353 insertions(+), 11 deletions(-)
> 
> -- 
> 2.43.0
> 

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