ttyUSB device driver is not stable

[liuyonggang]

Platform：imx8qxp

Environment：Yocto

kernel version：linux  4.14.98-gf66a1a7-dirty

question：

connect 5G module into USB port(J39) on imx8qxp Demo board.log as followings(It will be always recycle like as followings):

[ 1277.550766] usb 1-1: USB disconnect, device number 65
[ 1277.556260] option 1-1:1.0: device disconnected
[ 1277.564421] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 1277.572732] option 1-1:1.1: device disconnected
[ 1277.578066] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 1277.586228] option 1-1:1.2: device disconnected
[ 1277.591424] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 1277.599591] option 1-1:1.3: device disconnected
[ 1277.604773] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 1277.612938] option 1-1:1.4: device disconnected
[ 1277.618084] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5
[ 1277.626219] option 1-1:1.5: device disconnected
[ 1277.905668] usb 1-1: new high-speed USB device number 66 using ci_hdrc
[ 1278.081569] option 1-1:1.0: GSM modem (1-port) converter detected
[ 1278.089166] option 1-1:1.1: GSM modem (1-port) converter detected
[ 1278.097776] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1278.105159] option 1-1:1.2: GSM modem (1-port) converter detected
[ 1278.113719] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1278.121069] option 1-1:1.3: GSM modem (1-port) converter detected
[ 1278.129574] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
[ 1278.137000] option 1-1:1.4: GSM modem (1-port) converter detected
[ 1278.143535] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB4
[ 1278.153149] option 1-1:1.5: GSM modem (1-port) converter detected
[ 1278.159653] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB5

It looks like ttyUSB device driver is not stable. It is the problem that is software or hardware?

can someone help me？

   BRs

Johnny

[igorpadykov]

Hi Johnny

for hardware one can check 5G module power supplies, as module may consume

much power one can consider external power supply.

For software one can ask updated module driver from vendor of this module.

Best regards
igor
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