pr_debug信息：
In MVC:mxc_v4l_ioctl
In MVC: mxc_v4l_do_ioctl c0445611
case VIDIOC_DQBUF
In MVC:mxc_v4l_dqueue
ERROR: v4l2 capture: mxc_v4l_dqueue timeout enc_counter 0
In MVC:mxc_v4l_ioctl
In MVC: mxc_v4l_do_ioctl 40045613
case VIDIOC_STREAMOFF
logcat 信息：
I/FslCameraHAL( 2264): stream thread received STREAM_START command
I/FslCameraHAL( 2264): Created device thread
I/FslCameraHAL( 2264): handleStream: get invalid message
I/FslCameraHAL( 2264): handleStream: get invalid message
E/FslCameraHAL( 2264): GetFrame: VIDIOC_DQBUF Failed
E/FslCameraHAL( 2264): device thread exit with frame = null, 3 buffers still in v4l
E/FslCameraHAL( 2264): handleError handle error:2
自己写的camera测试程序一直读可以显示preview，流畅不卡，但是用Android系统的camera就出现如上错误，相机的preview就是黑色的，但是不出现ANR错误，请大神指点指点！！
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