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UDL doesn't support vblank functionality so we don't need to initialize vblank here (we are able to send page flip completion events even without vblank initialization) Moreover current drm_vblank_init call with num_crtcs > 0 causes sending DRM_EVENT_FLIP_COMPLETE event with zero timestamp every time. This breaks userspace apps (for example weston) which relies on timestamp value. Cc: stable@vger.kernel.org Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180928144126.21598-1-Eugeniy.Paltsev@synopsys.com