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31ecebee9c
[Why] We dropped the delay after changed the cursor functions locking the entire pipe to locking just the CURSOR registers to fix page flip stuttering - this introduced cursor stuttering instead, and an underflow issue. The cursor update can be delayed indefinitely if the cursor update repeatedly happens right around VUPDATE. The underflow issue can happen if we do a viewport update on a pipe on the same frame where a cursor update happens around VUPDATE - the old cursor registers are retained which can be in an invalid position. This can cause a pipe hang and indefinite underflow. [How] The complex, ideal solution to the problem would be a software triple buffering mechanism from the DM layer to program only one cursor update per frame just before VUPDATE. The simple workaround until we have that infrastructure in place is this change - bring back the delay until VUPDATE before locking, but with some corrections to the calculations. This didn't work for all timings before because the calculation for VUPDATE was wrong - it was using the offset from VSTARTUP instead and didn't correctly handle the case where VUPDATE could be in the back porch. Add a new hardware sequencer function to use the existing helper to calculate the real VUPDATE start and VUPDATE end - VUPDATE can last multiple lines after all. Change the udelay to incorporate the width of VUPDATE as well. Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@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> |
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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.
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.