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

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

[bugzilla-daemon]

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

[bugzilla-daemon]

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

--- Comment #1 from Jian-Hong Pan (jhp@endlessos.org) ---
Created attachment 299603
  --> https://bugzilla.kernel.org/attachment.cgi?id=299603&action=edit
Full dmesg log with the patch series "drm/vc4: kms: Misc fixes for HVS commits"

Thanks to Maxime's reply from
https://lore.kernel.org/lkml/20211115113348.aylgkwrmaaomqrp4@gilmour/T/

So, I applied the patch series "drm/vc4: kms: Misc fixes for HVS commits" [1]
based on latest mainline kernel at commit 8ab774587903 ("Merge tag
'trace-v5.16-5' of
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace"), which
almost equals "tags/v5.16-rc1".

However, the system hangs and becomes dead at the kernel message:

[drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0

If I revert the patch series to the original mainline kernel, system can boot
up.

[1]:
https://lore.kernel.org/dri-devel/20211115113105.103275-1-maxime@cerno.tech/

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

[bugzilla-daemon]

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

[bugzilla-daemon]

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

Jian-Hong Pan (jhp@endlessos.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #3 from Jian-Hong Pan (jhp@endlessos.org) ---
Have not seen this error messages with the new kernel 5.17.  So, close it.

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