[Bug 96593] [i915] Mouse movement jitter after 'drm/i915: Use atomic commits for legacy page_flips'

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96593

--- Comment #2 from Daniel Vetter <daniel at ffwll.ch> ---
Write a bunch of quick hacks which all blew up in testing (just wanted to
confirm that my hunch about the stalls was right).

Proper fix I think needs the following bits:
- address the FIXME in intel_atomic_commit_tail about when commit_hw_done()
should be called. We need to make sure that this is before any of the expensive
vblank waits, which needs the separate worker as described in the comments.

- in wait_for_depencies don't stall for flip_done for legacy cursor updates

This essentially gets us halfway there to faster-than-vrefresh updates. The
other bits needed would just be the correct flip_done signalling, and switching
the wait_for_vblank (before cleanup_planes) over to wait_for_flip.

Typing this down since I'm going on vacation soon and probably won't be able to
fix this all up.

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