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It was originally introduced following the VESA spec in order to validate PSR. However we found so many issues around sink_crc that instead of helping PSR development it only brought another layer of trouble to the table. So, sink_crc has been a black whole for us in question of time, effort and hope. First of the problems is that HW statement is clear: "Do not attempt to use aux communication with PSR enabled". So the main reason behind sink_crc is already compromised. For a while we had hope on the aux-mutex could workaround this problem on SKL+ platforms, but that mutex was not reliable, not tested, and we shouldn't use according to HW engineers. Also, nor source, nor sink designed and implemented the sink_crc to be used like we are trying to use here. Well, the sink side of things is also apparently not prepared for this case. Each panel that we tried seemed to have a different behavior with same code and same source. So, for all the time we lost on trying to ducktape all these different issues I believe it is now time to move PSR to a more reliable validation. Maybe not a perfect one as we dreamed for this sink_crc, but at least more reliable. Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180705192528.30515-1-rodrigo.vivi@intel.com |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.