Re: High speed devices with kernel 2.6.21.5.

On Tue, 17 Jul 2007, Branden Sletteland wrote:

> > I'm at a loss.  Clearly you've got weird hardware.  Do you know of any
> > other systems with the same type of host controller to compare against?
> 
> We have an evaluation board with this host controller that behaves the
> same way.  A Google search of ISP1563 doesn't get many useful hits, so
> it seems there aren't many uses of it or no one is advertising it.
> 
> >
> > I don't want to add in the delay you suggested, although maybe it would
> > be okay if it were reduced down to just 1 ms.  Is that long enough to
> > make the thing work okay?
> 
> Yes, I have been doing some testing and have been able to go as low as
> 500 us, but that is probably getting rounded up since Hz is set to
> 1000 in my build, and it is usually set at 250.

Then the solution is straightforward.  You should create a quirks entry
for this controller, and use it to decide whether to delay or call
usb_hcd_poll_root_hub directly.

Alan Stern



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