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Cable ID is a DP2 feature to identify max certified link rate that a cable can carry. The cable identification method requires both cable and display hardware support. Since the specs comes late, it is anticipated that the first round of DP2 cables and displays may not be fully compatible to reliably return cable ID data. Therefore the decision of our cable id policy is that if the cable can return non zero cable id data, we will take cable's link rate capability into account. However if we get zero data, the cable link rate capability is considered inconclusive. In this case, we will not take cable's capability into account to avoid of over limiting hardware capability from users. The max overall link rate capability is still determined after actual dp pre-training. Cable id is considered as an auxiliary method of determining max link bandwidth capability. Reviewed-by: George Shen <George.Shen@amd.com> Acked-by: Alan Liu <HaoPing.Liu@amd.com> Signed-off-by: Wenjing Liu <wenjing.liu@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.