CP2102 UART adapter not attaching

[Hans Petter Selasky]

On 01/13/16 07:04, Mark Johnston wrote:
> On Mon, Jan 11, 2016 at 09:41:01AM +0100, Hans Petter Selasky wrote:
>> On 01/10/16 05:07, Mark Johnston wrote:
>>> Hi,
>>>
>>> I have the module listed here:
>>> http://www.amazon.com/KEDSUM%C2%AE-CP2102-Module-Download-Converter/dp/B009T2ZR6W
>>>
>>> Under Windows 8 it works perfectly, but on FreeBSD-CURRENT I get:
>>>
>>> usb_alloc_device: set address 3 failed (USB_ERR_STALLED, ignored)
>>> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
>>> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
>>> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
>>> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
>>> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
>>> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
>>> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
>>> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
>>> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
>>> ugen1.3: <Unknown> at usbus1 (disconnected)
>>> uhub_reattach_port: could not allocate new device
>>>
>>> It looks like this device should be handled by uslcom(4), but it looks
>>> like we can't even get the device descriptor. How can I go about
>>> debugging this?
>>
>> Hi,
>>
>> What does "usbconfig" say about your USB controllers?
>>
>> Did you try to connect through an external USB HUB?
>
> No, I don't have one handy. usbconfig shows:
>
> ugen0.1: <XHCI root HUB 0x8086> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps) pwr=SAVE (0mA)
> ugen1.1: <EHCI root HUB Intel> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE (0mA)
> ugen2.1: <EHCI root HUB Intel> at usbus2, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE (0mA)
>

Could you show what "pciconf -lv" says about xhci0. Sometimes you need 
to set a special routing register before some XHCI controllers work!

>>
>> The log you show basically shows that the device is refusing to enumerate.
>>
>> You can try adding "options USB_REQ_DEBUG" to GENERIC. Then you'll have
>> some more sysctl knobs under hw.usb which allows you to try to figure
>> out timing related issues.
>
> I tried increasing several hw.usb.timings sysctl values but haven't had
> any luck so far.
>
>>
>> Which version of FreeBSD are you using?
>
> CURRENT at r293678 with some local modifications. No changes to the USB
> stack though.
>

--HPS