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-...@kernel-bugs.osdl.org
Reporter: j...@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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