On Tue, Sep 17, 2019 at 09:29:34PM +1000, JH wrote: > Hi, > > I am running kernel LTS 4.19 in an i.MX6 board with a 4G LTE modem, it > continually displayed following messages in a serial port tried and > failed to connect to LTE modem, are there any problems in kernel 4.19 > LTS to support usb qmi protocol and LTE modem connection? > > I did try the kernel version 5.1, it can connect to the modem, but > failed in couple of hours or days, when it disconnected, it got the > same following messages. > > Are there serious problems in kernel to support usb qmi LTE modem > communication and connection? > > [ 43.837243] option1 ttyUSB0: GSM modem (1-port) converter now disconnected f0 > [ 43.882941] option 1-1:1.0: device disconnected > [ 43.942788] option1 ttyUSB1: GSM modem (1-port) converter now disconnected f1 > [ 44.001445] option 1-1:1.2: device disconnected > [ 44.011575] qmi_wwan 1-1:1.3: nonzero urb status received: -71 > [ 44.017461] qmi_wwan 1-1:1.3: wdm_int_callback - 0 bytes > [ 44.022801] qmi_wwan 1-1:1.3: wdm_int_callback - usb_submit_urb failed with 9 > [ 44.059958] qmi_wwan 1-1:1.3 wwan0: unregister 'qmi_wwan' usb-ci_hdrc.1-1, We > [ 47.675604] usb 1-1: new high-speed USB device number 5 using ci_hdrc > [ 47.905246] usb 1-1: New USB device found, idVendor=05c6, idProduct=90b2, bc0 > [ 47.913732] usb 1-1: New USB device strings: Mfr=3, Product=2, SerialNumber=4 > [ 47.921099] usb 1-1: Product: Qualcomm CDMA Technologies MSM > [ 47.927087] usb 1-1: Manufacturer: Qualcomm, Incorporated > [ 47.932746] usb 1-1: SerialNumber: 5ff10299 > [ 47.964528] option 1-1:1.0: GSM modem (1-port) converter detected > [ 47.989484] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0 > [ 48.014760] option 1-1:1.2: GSM modem (1-port) converter detected > [ 48.026996] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1 > [ 48.048810] qmi_wwan 1-1:1.3: cdc-wdm0: USB WDM device > [ 48.082751] qmi_wwan 1-1:1.3 wwan0: register 'qmi_wwan' at usb-ci_hdrc.1-1, 8 > [ 51.581595] usb 1-1: USB disconnect, device number 5 > [ 51.613737] option1 ttyUSB0: GSM modem (1-port) converter now disconnected f0 > [ 51.644564] option 1-1:1.0: device disconnected > [ 51.713919] option1 ttyUSB1: GSM modem (1-port) converter now disconnected f1 > [ 51.771139] option 1-1:1.2: device disconnected The device is disconnecting itself from the USB bus, and then connecting itself, and then disconnecting... Probably an electrical issue, the kernel can not disconnect a device directly from the USB bus, that information comes from the USB hub itself. Try your connections. thanks, greg k-h
