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TVP5150通过VPIF接DM6467,收不到数据

Other Parts Discussed in Thread: TVP5150

我采用TVP5150+DM6467来采集数据,TVP5150接在DM6467的VPIF接口上。我利用V4L2的测试程序来采集视频,但是当程序运行的ret = ioctl(*capture_fd, VIDIOC_DQBUF, &buf);时,程序阻塞在此处?请问这可能是什么原因,谢谢。