Alan Stern wrote: > On Wed, 21 Oct 2009, Clemens Ladisch wrote: > > > But with xHCI, the hardware does all the scheduling as soon as an > > > altsetting is installed. > > > > As far as I understand the spec, this is the intended (or at least > > allowed) behaviour for all HCs. > > To my knowledge, the spec doesn't discuss this one way or another. Not explicitly, but it is implied by the existence of pipes as a separate object. The spec speaks about allocating bandwidth (and therefore making scheduling decisions) when creating pipes, and that pipes exist even when there are no active URBs (IRPs). Best regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
