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3d4e52d0cf
[why] There's currently no method to enable multi-stream synchronization from userspace and we don't check the VSDB bits to know whether or not specific displays should have the feature enable. [how] Add a debugfs entry that controls a new DM debug option, "force_timing_sync". This debug option will set on any newly created stream following the change to the debug option. Expose a new interface from DC that performs the timing sync and a helper to the "force_timing_sync" debugfs that iterates over the current streams and modifies the current synchornization state and grouping. Example usage to force a resync (from an X based desktop): echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_force_timing_sync xset dpms force off && xset dpms force on Signed-off-by: Victor Lu <victorchengchi.lu@amd.com> Reviewed-by: Aurabindo Jayamohanan Pillai <Aurabindo.Pillai@amd.com> Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Acked-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@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.