SIM card related Projects » osmo-ccid-firmware

While working on https://osmocom.org/issues/5285 I found a problem.

1. I connect the PSU to the sysmoOCTSIM
2. I connect the USB to the computer
The reader is enumerated fine.

The kernel says:

[  935.618635] usb 1-6: new full-speed USB device number 47 using xhci_hcd
[  935.768201] usb 1-6: New USB device found, idVendor=1d50, idProduct=6141, bcdDevice= 0.00
[  935.768203] usb 1-6: New USB device strings: Mfr=1, Product=2, SerialNumber=7
[  935.768204] usb 1-6: Product: sysmoOCTSIM 0.2.67-30c2
[  935.768205] usb 1-6: Manufacturer: sysmocom - s.f.m.c. GmbH
[  935.768206] usb 1-6: SerialNumber: df4be7f03335355320202034433b15ff
[  935.770574] cdc_acm 1-6:1.1: ttyACM0: USB ACM device

3. I unplug the USB cable
The kernel says:

[  972.124864] usb 1-6: USB disconnect, device number 47

4. I re-plug the USB cable
The reader is NOT enumerated. I can't see it using lsusb(1) command for example.

The kernel says:

[  980.394506] usb 1-6: new full-speed USB device number 48 using xhci_hcd
[  980.522700] usb 1-6: device descriptor read/64, error -71
[  980.758545] usb 1-6: device descriptor read/64, error -71
[  980.994493] usb 1-6: new full-speed USB device number 49 using xhci_hcd
[  981.122509] usb 1-6: device descriptor read/64, error -71
[  981.362514] usb 1-6: device descriptor read/64, error -71
[  981.470571] usb usb1-port6: attempt power cycle
[  981.882450] usb 1-6: new full-speed USB device number 50 using xhci_hcd
[  981.882654] usb 1-6: Device not responding to setup address.
[  982.090774] usb 1-6: Device not responding to setup address.
[  982.298479] usb 1-6: device not accepting address 50, error -71
[  982.426545] usb 1-6: new full-speed USB device number 51 using xhci_hcd
[  982.426681] usb 1-6: Device not responding to setup address.
[  982.634593] usb 1-6: Device not responding to setup address.
[  982.842482] usb 1-6: device not accepting address 51, error -71
[  982.842584] usb usb1-port6: unable to enumerate USB device

Unplug/replug when the PSU is NOT used works fine. But that is not surprising since the reader gets a complete power cycle.

But when the PSU IS connected the reader is not reset-ed correctly or at all on USB unplug/replug.