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[Why] In dp_get_lane_status_and_lane_adjust(), we call core_link_read_dpcd() to get lane status but we ignore the return value of the function. If there is problem with AUX and we eventually can only get partial data from monitor, we might misuse the data to jude the link training result. Which could have us trapped in the dc_link_dp_perform_link_training() since we thought that we can still give a try on another link setting. [How] In dp_get_lane_status_and_lane_adjust(), take return value of core_link_read_dpcd() into account. If we fail to read all requested data, we treat lanes status as previous one and repeat LT steps again. Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com> Acked-by: Agustin Gutierrez <agustin.gutierrez@amd.com> Signed-off-by: Wayne Lin <Wayne.Lin@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@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.