Boris Brezillon <boris.brezil...@bootlin.com> writes: > drm_atomic_helper_wait_for_vblanks() assumes the CRTC will continuously > generate VBLANK events and the vblank counter will keep increasing. > While this work for a regular pipeline, it doesn't when you have the > CRTC is feeding the transposer block, because this block works in > oneshot mode, and, by the time we reach > drm_atomic_helper_wait_for_vblanks() the only VBLANK event might have > already been sent and the VBLANK counter will stay unchanged, thus > triggering a timeout. > > Luckily, we can replace the drm_atomic_helper_wait_for_vblanks() call > by drm_atomic_helper_wait_for_flip_done() because the only thing we > want to check when calling drm_atomic_helper_wait_for_vblanks() from > vc4_atomic_complete_commit() is that new FBs are in use and the old > ones can be safely released. > > Signed-off-by: Boris Brezillon <boris.brezil...@bootlin.com>
Reviewed-by: Eric Anholt <e...@anholt.net>
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