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8633d96d3c
[Why] Some displays take some time to power up AUX CH once they are put into D3 state via write to DPCD 600h=2. Interestingly enough, some display may simply NACK, but some might also ACK with a bunch of 0s, which can cause issues with receiver cap retrieval. Note that not all DPCD address return 0s, but in particular it has been observed on some higher DPCD address such as DPCD 2200h, etc. [How] Based on spec, receiver will monitor differential signal while in D3 and AUX CH is in low power mode. When detected, it may allow up to 1 ms to power up AUX CH and reply. If we read Sink power state D3, we should add 1 ms delay to satisfy this spec requirement. Signed-off-by: Anthony Koo <anthony.koo@amd.com> Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com> Acked-by: Leo Li <sunpeng.li@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.