usb usb1-port1: disabled by hub (EMI?), re-enabling

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    ---Set up---

    1) We are evaluating using Raspberry Pi Compute Module CM3.

    2) USB HUB and USB UART are boarded on the IO board.

    3) USB HUB is working in self-power mode.

    4) VBUS detect USB HUB uses the same 3.3V power supply as CM3.

    5) Two LTE modules are connected to USB-HUB via USB-SERIAL and each LTE module takes 2A --- Protocol --- AT commands


    ---Problem----

    The LTE modules which are connected to USB-HUB are disconnecting. This problem occurs only sometimes not always


    Following are kernel logs.


    Kerenl log:

    19:47:58 raspberrypi kernel: [9301.001438] usb1-port1: disabled by hub (EMI?), Re-enabling ...

    19:47:58 raspberrypi kernel: [9301.001457] usb 1-1: USB disconnect, device number 11

    19:47:58 raspberrypi kernel: [9301.001463] usb 1-1.1: USB disconnect, device number 12

    19:47:58 raspberrypi kernel: [9301.001668] ftdi_sio ttyUSB2: error from flowcontrol urb

    19:47:58 raspberrypi kernel: [9301.001872] ftdi_sio ttyUSB2: FTDI USB Serial Device converter now disconnected from ttyUSB2

    19:47:58 raspberrypi kernel: [9301.001906] ftdi_sio 1-1.1: 1.0: device disconnected

    19:47:58 raspberrypi kernel: [9301.002107] ftdi_sio ttyUSB3: error from flowcontrol urb

    19:47:58 raspberrypi kernel: [9301.003371] ftdi_sio ttyUSB3: FTDI USB Serial Device converter now disconnected from ttyUSB3

    19:47:58 raspberrypi kernel: [9301.003429] ftdi_sio 1-1.1: 1.1: device disconnected

    19:47:58 raspberrypi kernel: [9301.010150] ftdi_sio ttyUSB4: FTDI USB Serial Device converter now disconnected from ttyUSB4

    19:47:58 raspberrypi kernel: [9301.010212] ftdi_sio 1-1.1: 1.2: device disconnected

    19:47:58 raspberrypi kernel: [9301.010430] ftdi_sio ttyUSB5: error from flowcontrol urb

    19:47:58 raspberrypi kernel: [9301.018012] ftdi_sio ttyUSB5: FTDI USB Serial Device converter now disconnected from ttyUSB5


    --- --- Question


    Any investigation method and solution?

    Edited once, last by hyle ().