FTDI USB Serial Device converter now disconnected

[KennyBertone]

Hi all,

 

I am using an Orange Pi PC PLUS2 with everything in the emmc for controlling another device through a serial connection (rs485) with a serial converter using FTDI chips.

I am using docker containers to embed my application and easily deploy/share it.

 

using uname -a gives me:

Linux host-test 4.14.15-sunxi #28 SMP Mon Jan 29 07:24:48 CET 2018 armv7l GNU/Linux

 

The problem is that randomly I get the following error:

 

[135431.500807] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[137213.011801] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[138650.664850] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[140559.020691] ohci-platform 1c1b400.usb: frame counter not updating; disabled
[140559.020972] ohci-platform 1c1b400.usb: HC died; cleaning up
[140559.025797] usb 6-1: USB disconnect, device number 2
[140560.099001] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[140560.099018] ftdi_sio ttyUSB0: urb failed to clear flow control
[140560.099652] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[140560.099738] ftdi_sio 6-1:1.0: device disconnected

 

After that I can't use the serial converter anymore. It does not appear on ttyUSB0 and I don't manage to make it work again. I tried to rmmod both "ftdi_sio" and "usbserial" and modprobe them again, but nothing changes. The only way to fix it is to reboot the system.

 

I am experimenting a lot with modules like pylibftdi, vpc drivers vs d2xx ones, etc...without results.

 

I am really struggling a lot with this and I can't find any real or clear help online. Unfortunately this is a big issue since it makes my SW unusable and I can't really deliver it like this. It is worth noting that I never saw this issue without using docker.

 

My questions are:

- Does anyone have any clue how to solve this or can provide any help (it is really a big issue for me)?

- At least, does anyone have any idea how to restore the serial line without rebooting?

 

 

Thanks a lot in advance.

[KennyBertone]

Just adding some more info for this issue that is haunting me.
 

After seeing that "rmmod" doesn't provide me any help so far, I tried to directly bind and unbind bus drivers (both usb hub and ftdio) without any success. The only thing worth mentioning is that I got this error with one of the hub:

 

[221495.711378] hub 8-0:1.0: USB hub found
[221495.711399] hub 8-0:1.0: config failed, can't read hub descriptor (err -22)