[Bug 93147] [regression bisected] Stuttering in games caused by commit 4dfd6486 "drm: Use vblank timestamps to guesstimate how many vblanks were missed"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93147

--- Comment #13 from Mario Kleiner <mario.kleiner at tuebingen.mpg.de> ---
Created attachment 120350
  --> https://bugs.freedesktop.org/attachment.cgi?id=120350&action=edit
v2 of the radeon-kms fix: Slightly more efficient.

Same as original, but busy wait in flip_work_func replaced by hr-timer sleep
with event lock released, for more efficiency. Ditto for the following amdgpu
fix v2.

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