Missing USB on Intel Cherryview

[Hans Petter Selasky]

On 11/27/18 12:53 PM, Tom Jones wrote:
> Hi,
> 
> I have a Intel Cherryview based laptop with Braswell XHCI. The laptop has two
> usb ports, a USB-A port routed to USB3 (this works) and a USB-C port routed a
> USB 2 bus.
> 
> The USB bus routed to the USB-C port does not appear under FreeBSD.
> 
> xhci0: <Intel Braswell USB 3.0 controller> mem 0xa1a00000-0xa1a0ffff at device 20.0 on pci0
> xhci0: 32 bytes context size, 64-bit DMA
> usbus0 on xhci0
> usbus0: 5.0Gbps Super Speed USB v3.0
> 
> There is full (if slightly old) dmesg here: https://dmesgd.nycbug.org/index.cgi?do=view&id=3213
> 
> It is picket up on Linux:
> 
> [   19.200330] uhci_hcd: USB Universal Host Controller Interface driver
> [   19.200827] xhci_hcd 0000:00:14.0: xHCI Host Controller
> [   19.200855] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 1
> [   19.202004] xhci_hcd 0000:00:14.0: hcc params 0x200077c1 hci version 0x100 quirks 0x0000000081509810
> [   19.202019] xhci_hcd 0000:00:14.0: cache line size of 64 is not supported
> [   19.202522] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.18
> [   19.202526] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
> [   19.202529] usb usb1: Product: xHCI Host Controller
> [   19.202534] usb usb1: Manufacturer: Linux 4.18.0-10-generic xhci-hcd
> [   19.202537] usb usb1: SerialNumber: 0000:00:14.0
> [   19.203545] hub 1-0:1.0: USB hub found
> [   19.203579] hub 1-0:1.0: 7 ports detected
> [   19.205628] xhci_hcd 0000:00:14.0: xHCI Host Controller
> [   19.205638] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 2
> [   19.205649] xhci_hcd 0000:00:14.0: Host supports USB 3.0  SuperSpeed
> [   19.205764] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 4.18
> [   19.205768] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
> [   19.205771] usb usb2: Product: xHCI Host Controller
> [   19.205774] usb usb2: Manufacturer: Linux 4.18.0-10-generic xhci-hcd
> [   19.205777] usb usb2: SerialNumber: 0000:00:14.0
> [   19.206868] hub 2-0:1.0: USB hub found
> [   19.206907] hub 2-0:1.0: 6 ports detected
> 
> It is also picked up on NetBSD, but conversations with stejda@ raise some
> doubts about support there.
> 
> xhci0 at pci0 dev 20 function 0: vendor 8086 product 22b5 (rev. 0x34)
> xhci0: interrupting at msi0 vec 0
> xhci0: xHCI version 1.0
> usb0 at xhci0: USB revision 3.0
> usb1 at xhci0: USB revision 2.0
> 
> I have done some digging, but don't the background with usb to really know
> where to look. Could someone give me some pointers for what to try?
> 
> - Tom
> 

Hi,

Currently there is not so much to try, but you can start poking in 
sys/dev/usb/controller/xhci*.[ch] . I have not made any USB-C specific 
changes to the XHCI driver in FreeBSD, so yes, it might not work.

There are also some debug knobs: sysctl -a | grep xhci

--HPS