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29d5ac563c
[Why] 1. the corrected timing to write DPCD 300h AMD signature is before link training. 2. and VBIOS will writes correctted AMD signature by after AGESA 1.0.0, so driver doesn't need to write DPCD 300h again to switch config. 3. there are some OLED panel will clean backlight level to 0 once receive DPCD 300h, so we will see flicker issue at that time. [How] read DPCD 300h signature before write it to avoid reprogram again, if AMD signature was writed corrected by VBIOS, driver will not reprogram it again. Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Yu-ting Shen <Yu-ting.Shen@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.
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.