Bug 214991
| Summary: | VC4 DRM waiting for flip down makes UI freeze a while with kernel 5.15 | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Jian-Hong Pan (jhp) |
| Component: | Video(DRI - non Intel) | Assignee: | drivers_video-dri |
| Status: | RESOLVED CODE_FIX | ||
| Severity: | normal | CC: | pbrobinson |
| Priority: | P1 | ||
| Hardware: | ARM | ||
| OS: | Linux | ||
| Kernel Version: | 5.15 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
Full dmesg log
Full dmesg log with the patch series "drm/vc4: kms: Misc fixes for HVS commits" Full dmesg log with the v2 patch series "drm/vc4: kms: Misc fixes for HVS commits" |
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Created attachment 299603 [details] 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/ Created attachment 299625 [details] 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 Have not seen this error messages with the new kernel 5.17. So, close it. |
Created attachment 299547 [details] 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.