2005/12/17, Alan Stern <[EMAIL PROTECTED]>:
> On Fri, 16 Dec 2005, Franck wrote:
>
> > > No, that's not what it means. Suspending all the devices attached to a
> > > bus is different from suspending the bus itself.
> > >
> >
> > Well stopping any activity on the bus (that's what happen when
> > suspending all devices from the bus) sounds to me like suspending the
> > bus...
>
> But suspending the devices _doesn't_ stop all activity on the bus. It
> doesn't stop SOF packets, for instance. At least, it doesn't with UHCI,
> OHCI, or EHCI controllers.
>
hmm, suspending a usb device means stop sending SOF packets, doesn't it ?
> > > > BTW, I notice a regression. I can not use anymore my usb stick with an
> > > > embedded hub, I got the following error message:
> > > > """
> > > > usb 1-1: new full speed USB device using vusb-hcd and address 5
> > > > usb 1-1: can't connect bus-powered hub to this port
> > > > hub 1-0:1.0: state 5 ports 1 chg 0000 evt 0002
> > >
> > > That's not a regression -- it's what should have happened all along!
> > >
> >
> > weird...it didn't happen with 2.6.14
>
> That's because the code was added since 2.6.14 was released.
>
> > > This says that the embedded hub in your stick needs 100 mA to run. You
> > > didn't say how much power is available from your host controller's port,
> > > but apparently it only provides 100 mA (otherwise the error message
> > > wouldn't have appeared).
> >
> > nope, my hcd->power_budget is set to 500mA. This error is printed by
> > hub_port_connect_change in hub.c. The condition that refuses the new
> > device is not related to power budget, is it ?
>
> Yes it is. It's trying to avoid having a bus-powered hub plugged into
> another bus-powered hub.
>
Sorry I meant the condition is not related to the value I put in
hcd->power_budget. So what's wrong when plugging this compound device
into my roothub ?
Thanks
--
Franck
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