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

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

--- Comment #1 from Jian-Hong Pan (jhp@xxxxxxxxxxxxx) ---
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@xxxxxxxxxx/

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