[SLOF] Keyboard not working when using XHCI as a USB host controller?

[Dinar Valeev]

On Tue, Aug 4, 2015 at 10:09 PM, Thomas Huth <thuth at redhat.com> wrote:
> On 04/08/15 18:56, Segher Boessenkool wrote:
>> On Tue, Aug 04, 2015 at 01:32:25PM +0200, Thomas Huth wrote:
>>> When I use the following command line to start a guest:
>>>
>>>  qemu-system-ppc64 -machine pseries,accel=kvm,usb=off \
>>>      -device pci-ohci,id=usb,bus=pci.0,addr=0x2 \
>>>      -device usb-kbd,id=input0 -nographic -vga none
>>>
>>> ... SLOF correctly discoveres a keyboard during USB scan:
>>
>>> However, when I start with an XHCI (or EHCI) controller
>>> instead:
>>>
>>>  qemu-system-ppc64 -machine pseries,accel=kvm,usb=off \
>>>      -device nec-usb-xhci,id=usb,bus=pci.0,addr=0x2 \
>>>      -device usb-kbd,id=input0 -nographic -vga none
>>>
>>> ... SLOF does not discover any keyboard:
>>
>> I don't know what those qemu options mean *exactly*, but I've
>> never heard of a keyboard that talks SS (HS are rare too, most
>> are FS these days) -- so the device should show up on a companion
>> controller, which should be OHCI as well.  What host controllers
>> were detected?
>
> AFAIK for XHCI, you don't need these companion controllers anymore,
> e.g. see:
> https://en.wikipedia.org/wiki/Extensible_Host_Controller_Interface#Simplified_driver_architecture
>
> So I think the keyboard should show up at the XHCI controller when I
> only specify the XHCI - but I am also not very experienced with XHCI
> yet, so I might also be wrong here.
I've seen exactly the same issue. When I debugged -usb tablet issue.
So I'd say it is broken :)
>
>  Thomas
>
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