华为4G ME909S-821芯片通过USB连接到到嵌入式linux板子上,设备反复连接又断开
目前在开发板上碰到这问题,当在供电华为USB接口的 ME909S-821 4G模块后,嵌入式linux板子在 识别该USB设备过程中,总是出现先识别出ttyUSB0....4,接着roothub检测到接入的usb port的portstatus发生改变,由480Mbps变为了12Mbps,从而 将所有 ttyUSBx依次又断掉,板子反复这个过程。 USB大虾们请给点调试意见,谢谢了!
状态如下: loop:
Next:
[ 1152.585000] usb 1-1: new high-speed USB device number 2 using musb-hdrc
[ 1152.690000] usb 1-1: New USB device found, idVendor=12d1, idProduct=05c1
[ 1152.690000] usb 1-1: New USB device strings: Mfr=3, Product=2, SerialNumber=0
[ 1152.690000] usb 1-1: Product: huawei Technologies
[ 1152.690000] usb 1-1: Manufacturer: huawei,Incorporated
[ 1152.700000] option 1-1:2.1: GSM modem (1-port) converter detected
[ 1152.705000] usb 1-1:2.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1152.715000] option 1-1:2: GSM modem (1-port) converter detected
....
[ 40.508697] usb 1-1: USB disconnect, device number 2
[ 40.514129] option: option_instat_callback: error -108
[ 40.520446] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 40.528900] option 1-1:2.0: device disconnected
[ 40.533996] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 40.542419] option 1-1:2.1: device disconnected
[ 40.549926] option: option_instat_callback: error -108
[ 40.555572] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 40.564056] option 1-1:2.2: device disconnected
[ 40.569152] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 40.577575] option 1-1:2.3: device disconnected
[ 40.582641] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 40.591064] option 1-1:2.4: device disconnected