Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> writes: > Replace the drm_atomic_helper_wait_for_vblanks() with a call to > drm_atomic_helper_wait_for_flip_done(). This allows better detection of > page flip done events which what we are really waiting for in > vc4_atomic_complete_commit(). > > With this approach, we also addresse the 'missed single vblank event' > problem that can arise when the CRTC is configured in oneshot mode > (only a single frame is generated and the CRTC is immediately paused > after this frame). Note that this oneshot mode will be used for the > writeback connector feature. Should we just use drm_atomic_helper_commit_tail() and make this change in the core helper, instead? Actually, I'm confused. drm_atomic_helper_commit_cleanup_done() seems to be waiting for the flip_done on the crtc, already. What's the difference?
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