Re: [Qemu-devel] Large USB patch

[Lonnie Mendez]

Lonnie Mendez wrote:

> > known problems:
> > 1. under linux the uhci controller reports an error if no usb device is
> > connected
> >  
>
>   The port registers on the uhci controller shows no appropriate 
> response to an HCHALT command that is issued and so the hcd puts the 
> controller into global suspend.

  The problem is more likely that the controller is being suspended but 
there is currently nothing being done to signal it to wake up on 
appropriate events.  If the error/warning message you got was something 
like "controller still running" then changing uhci writew to always set 
UHCI_STS_HCHALTED on writing 0 to bit 0 of cmd register seems to clear 
the message.  That means having the bit set in the frame is a bit 
redundant and also makes the bit a less accurate indicator of hchalt.