[Bug 214991] VC4 DRM waiting for flip down makes UI freeze a while with kernel 5.15

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214991

--- Comment #2 from Jian-Hong Pan (jhp@endlessos.org) ---
Created attachment 299625
  --> https://bugzilla.kernel.org/attachment.cgi?id=299625&action=edit
Full dmesg log with the v2 patch series "drm/vc4: kms: Misc fixes for HVS
commits"

Maxime sent v2 patch series at
https://www.spinics.net/lists/dri-devel/msg323342.html

System can boot into desktop environment now.  However, the UI still become
frozen  some times and shows the same error message:

[drm:drm_crtc_commit_wait] *ERROR* flip_done timed out
[drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:68:crtc-3] flip_done
timed out
[drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:68:crtc-3] commit
wait timed out
[drm:drm_crtc_commit_wait] *ERROR* flip_done timed out
vc4-drm gpu: [drm] *ERROR* Timed out waiting for commit

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