请教USB camera 问题

[quanfu7582]

最近在调试 UVC camera，内核把USB摄像头相关的配置都打开了，在dev 目录下出现了video1的设备节点，用android测试APP，测试，底层报了错：
[ 118.685046].(0)[1565:ra.simplewebcam]uvcvideo: Trying format 0x56595559 (YUYV): 640x480.
[ 118.686227].(0)[1565:ra.simplewebcam]uvcvideo: Using default frame interval 200000.0 us (5.0 fps).
[ 118.709016].(1)[131:surfaceflinger][USER ION_SHARE_CLOSE]
[ 118.709968].(1)[131:surfaceflinger][USER ION_SHARE_CLOSE] DONE
[ 118.715739].(1)[1565:ra.simplewebcam]uvcvideo: Setting frame interval to 1/15 (666666).
[ 118.729343].(1)[1565:ra.simplewebcam]uvcvideo: uvc_v4l2_mmap
[ 118.730738].(1)[1565:ra.simplewebcam]uvcvideo: uvc_v4l2_mmap
[ 118.731849].(1)[1565:ra.simplewebcam]uvcvideo: uvc_v4l2_mmap
[ 118.732942].(1)[1565:ra.simplewebcam]uvcvideo: uvc_v4l2_mmap
[ 118.735738].(1)[1565:ra.simplewebcam]uvcvideo: Device requested 1024 B/frame bandwidth.
[ 118.737308].(1)[1565:ra.simplewebcam]uvcvideo: Selecting alternate setting 3 (3072 B/frame bandwidth).
[ 118.755337].(0)[1565:ra.simplewebcam]uvcvideo: Allocated 5 URB buffers of 8x3072 bytes each.
[ 118.762019].(1)[1762:Thread-89]uvcvideo: uvc_v4l2_poll
[ 118.806176].(1)[305:Binder_3][USER ION_ALLOC] handle 0xa2fdbe
[ 119.080886].(0)[131:surfaceflinger][USER ION_SHARE_CLOSE]
[ 119.081810].(0)[131:surfaceflinger][USER ION_SHARE_CLOSE] DONE
[ 119.440735]-(0)[0:swapper/0]uvcvideo: Non-zero status (-71) in video completion handler.
[ 119.441903].(1)[1762:Thread-89]uvcvideo: uvc_v4l2_poll
[ 119.442354]-(0)[0:swapper/0]uvcvideo: Non-zero status (-71) in video completion handler.
[ 119.442478]-(0)[0:swapper/0]uvcvideo: Non-zero status (-71) in video completion handler.
[ 119.442601]-(0)[0:swapper/0]uvcvideo: Non-zero status (-71) in video completion handler.
[ 119.442722]-(0)[0:swapper/0]uvcvideo: Non-zero status (-71) in video completion handler.

以为是APP本身出错，为了验证，自己写了个标准的V4L2的C代码，编译到板子上，发现依旧会出现 Non-zero status (-71) in video completion handler错误。不知道你们遇到过没，分享你的经验。3Q

[Winston_Jory]

首先看芯片是否支持usb Camera