[SLOF] SLOF cannot setup peripherals behind an XHCI hub

[Laurent Vivier]

On 17/07/2016 06:32, Nikunj A Dadhania wrote:
> Nikunj A Dadhania <nikunj at linux.vnet.ibm.com> writes:
> 
>> Laurent Vivier <lvivier at redhat.com> writes:
>>
>>> Hi,
>>>
>>> I need some help on this...
>>>
>>> If I put USB peripherals behind an USB hub, behind an XHCI controller,
>>> SLOF cannot use them.
>>>
>>> -device nec-usb-xhci,id=controller1  \
>>> -device usb-hub,id=usbhub1,bus=controller1.0,port=1  \
>>> -device usb-mouse,id=usbmouse,port=1.1 \
>>> -device usb-kbd,id=usbkbd,port=1.2  \
>>> -device usb-tablet,id=usbtablet,port=1.3 \
>>>
>>> It works fine with pci-ohci controller or if I put peripherals directly
>>> on the XHCI controller (ports 2, 3, 4).
>>>
>> [...]
>>> Any idea?
>>
>> I will have a look at this tomorrow.
> 
> 
> Referred the spec and the code, that is a missing feature currently.
> 
> Section: 4.3.3 - Device Slot Initialization
> 3) Initialize the Input Slot Context data structure (6.2.2).
> 
> Root Hub Port Number = Topology defined.
> Route String = Topology defined 7 . Refer to section 8.9 in the USB3 spec. Note that the Route
> String does not include the Root Hub Port Number.
> Context Entries = 1.
> 
> We will need to implement USB 3.0: 8.9 Route String Field. 

Thank you for your answer.

Do you plan to implement it?

Thanks,
Laurent