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This patch is based on https://patchwork.kernel.org/patch/9801533, add the drm property "hdmi_output_format", the possible value could be: - RGB - YCBCR 444 - YCBCR 422 To handle various subsampling of YCBCR output types, this property allows two special automatic cases: - DRM_HDMI_OUTPUT_YCBCR_HQ This indicates preferred output should be YCBCR output, with highest subsampling rate by the source/sink, which can be typically: - ycbcr444 - ycbcr422 - ycbcr420 - DRM_HDMI_OUTPUT_YCBCR_LQ This indicates preferred output should be YCBCR output, with lowest subsampling rate supported by source/sink, which can be: - ycbcr420 - ycbcr422 - ycbcr444 Default value of the property is set to 0 = RGB, so no changes if you don't set the property. Change-Id: Ie4a98ba91c8285a2e8f1ec7832d73183ad57665e Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.