[Bug 106175] amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106175

--- Comment #64 from Nicholas Kazlauskas <nicholas.kazlauskas at amd.com> ---
Created attachment 142574
  --> https://bugs.freedesktop.org/attachment.cgi?id=142574&action=edit
0001-drm-amd-display-Add-fast-path-for-legacy-cursor-plan.patch

This patch is similar to the async_update one but it takes care to lock if
anything is modifying the plane. It's very close to what i915 does with a few
minor differences with framebuffer handling.

I've tested it for compton with Gallium HUD up and I no longer see the issue on
mouse movement (cursor fb changes are still a bit slow, so you'll still
probably see spikes on cursor changes).

You can try this on top of amd-staging-drm-next and I'd imagine it'd fix your
problems.

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