On Wed, Apr 15, 2009 at 8:48 PM, David Brownell <david-b@xxxxxxxxxxx> wrote: > On Wednesday 15 April 2009, Dan Streetman wrote: >> Yep, you are right on that point - so to adhere to spec, the TT >> scheduler really does need to rebalance the TT schedule to put all the >> interrupt transfers after isoc transfers. > > I'd not call that "rebalancing". Rebalancing is when the > arms of the schedule tree shift around. True enough. > In this case, all that's required is to make sure insertions > follow the "ISO first" rule. Which they should already be > doing ... if they aren't, things will break. I believe the issue is that in each uframe, the ordering is correct (isoc then interrupt) but across uframes, during a single frame, there is no logic to ensure all the isocs on the fullspeed bus are scheduled before any of the interrupts. I do believe that this works in most cases, it's just in some cases it's possible to misorder the CSPLITs, as Alan said. Moving existing interrupts to later uframes may be necessary. -- 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
