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

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Message-ID:
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Date: Wed, 27 Aug 2025 00:26:56 +0800
From: Shengyu Qu <wiagn233@...look.com>
To: Marius Vlad <marius.vlad@...labora.com>
Cc: wiagn233@...look.com, alexander.deucher@....com,
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Subject: Re: [PATCH v2 0/2] Add "pixel_encoding" to switch between RGB & YUV
 color modes

Hi Marius,

Thanks for reply.I have some questions:

1.Can you send patch with only i915/amdgpu first? It's a long-needed 
feature to deal with some monitors/TVs with broken EDID.

2.Is there any method to get the list of supported pixel format by 
current driver? Also maybe we need to take display port's maximum speed 
rate/target refresh rate/resolution into account.

Best regards,
Shengyu

在 2025/8/26 15:24, Marius Vlad 写道:
> 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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