[A64] usb0-vbus:disabling reset USB1 port

[vikas]

Hello,

I am using A64-OLinuXino-bionic-base-20201008-215447.img through SD card to boot A64.

Sometimes I get "usb0-vbus: disabling" and USB1 port reset, modem is connected over USB1. How this can controlled?

dmesg logs for reference:

[   33.765171] usb0-vbus: disabling
[  102.206787] PPP generic driver version 2.4.2
[  188.045454] PPP BSD Compression module registered
[  188.051533] PPP Deflate Compression module registered
[  627.099462] usb 3-1: USB disconnect, device number 2
[  627.100869] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  627.100946] option 3-1:1.0: device disconnected
[  627.104830] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  627.104909] option 3-1:1.1: device disconnected
[  627.109377] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  627.109461] option 3-1:1.2: device disconnected
[  627.112769] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  627.112874] option 3-1:1.3: device disconnected
[  627.116550] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[  627.116665] option 3-1:1.4: device disconnected
[  627.117204] qmi_wwan 3-1:1.5 wwan0: unregister 'qmi_wwan' usb-1c1b000.usb-1, WWAN/QMI device

[LubOlimex]

This is usually power related. But it can be something around the drivers and the way they are started/stopped.

Try to stop and start the USB to see if it recovers.

Modem dongles have very high and fast current spikes that cause the USB hub to disconnect them (because it believes it might be short-circuit).

Consider something like this: https://www.olimex.com/Products/USB-Modules/USB-CAP/