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[Why] Customer make a request to add this WA by driver. Some MUX chips will power down with eDP 1.4 panel and lose previous supported link rates(DPCD 0x010) in customer's hybrid-GPU designs. As a result, during sleep resuming and screen turns on from idle, link training will be performed incorrectly and eDP will flicker or black screen. These MUX chips need source to read DPCD 0x010 again during LKT so that it can restore supported link rates of panel. For driver side, supported link rate set is fetched when link detection, no need to update but just read again as WA. [How] Read DPCD 0x010 again during link training for eDP 1.4. Signed-off-by: Dale Zhao <dale.zhao@amd.com> Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
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| init | ||
| ipc | ||
| kernel | ||
| lib | ||
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| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| .mailmap | ||
| COPYING | ||
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| README | ||
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.
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.