AnsweredAssumed Answered

USB port drop.

Question asked by kang jianwei on Feb 10, 2019
Latest reply on Feb 11, 2019 by igorpadykov

imx7 usb host port connect to one external LTE modem, sometime the LTE USB CDC ethernet port can drop.  the dmesg  log as here:

 

usb 1-1: USB disconnect, device number 5
cdc_ether 1-1:1.0 wwan0: unregister 'cdc_ether' usb-ci_hdrc.1-1, Mobile Broadband Network Device
cdc_ether 1-1:1.4 wwan1: unregister 'cdc_ether' usb-ci_hdrc.1-1, Mobile Broadband Network Device
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: Cannot enable. Maybe the USB cable is bad?
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: Cannot enable. Maybe the USB cable is bad?
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: Cannot enable. Maybe the USB cable is bad?
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: cannot reset (err = -32)
usb usb1-port1: Cannot enable. Maybe the USB cable is bad?
usb usb1-port1: unable to enumerate USB device

 

what the root cause the error?  

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