[SLOF] SLOF cannot setup peripherals behind an XHCI hub

[Nikunj A Dadhania]

Laurent Vivier <lvivier at redhat.com> writes:

> 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.

Delayed though.

> Do you plan to implement it?

Lot of things in the todo, but will have to do if someone doesn't before
me.

Regards
Nikunj