Alternatively read two camera, one would stuck

[rossihwang]

• Hardware

  • host: tinker board 2s(rk3399)，kernel 5.13

  • slave: sg130gs(1280*720, YUYV, 30fps) + fpga(spartan 6) + cyusb3014, isochronous mode

• Problem

  • Run this script on host

    #!/bin/bash
    ​
    while : 
    do
            yavta -c30 /dev/video0
            sleep 2
            yavta -c30 /dev/video1
            sleep 2
    done

  • After random time(from minutes to hours), one of these cameras would be stuck

  • USB packets captured by tcpdump indicate that the host keeps polling(isochronous) the slave while the slave keeps responding with a data packet with zero-length

  • After this, if I restart the test script, the device that is stuck will be missed

• some trials on other settings also failed

  • ov5640(1280*720, YUYV,30fps) + cyusb3014, bulk mode

  • sg130gs(1280*720, YUYV, 30fps) + fpga(spartan 6) + cyusb3014, bulk mode

• In addition, test with a single camera is fine

Any ideas? thanks