[Bug 214991] New: 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

            Bug ID: 214991
           Summary: VC4 DRM waiting for flip down makes UI freeze a while
                    with kernel 5.15
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.15
          Hardware: ARM
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: jhp@endlessos.org
        Regression: No

Created attachment 299547
  --> https://bugzilla.kernel.org/attachment.cgi?id=299547&action=edit
Full dmesg log

I tested Linux mainline kernel 5.15 (aarch64) with enabled VC4 on RPi 4B. I
notice UI freezes a while (about 10 seconds) some times.

The kernel shows the error message during the time:

[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

It is easy to reproduce this issue by invoking GL related things, for example
es2gears.

After detail test, I found it is related to these commits:

f3c420fe19f8 ("drm/vc4: kms: Convert to atomic helpers")
82faa3276012 ("drm/vc4: kms: Remove async modeset semaphore")

This issue cannot be reproduced after I revert the commits.

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