On 01/13/2008 09:36 AM, David Brownell wrote: > Yes, please. The appended patch is that updated version. > > ======= CUT HERE > From: David Brownell <[EMAIL PROTECTED]> > > This adds a workaround for an issue reported with ISO transfers > on some EHCI controllers, most recently with VIA KT800 and PS3 > EHCI silicon. > > The issue is that the silicon doesn't necessarily seem to be done > using ISO DMA descriptors (itd, sitd) when it marks them inactive. > (One theory is that the ill-defined mechanism where hardware caches > periodic transfer descriptors isn't invalidating their state...) > With such silicon, quick re-use of those descriptors makes trouble. > Waiting until the next frame seems to be a sufficient workaround. > > This patch ensures that the relevant descriptors aren't available > for immediate re-use. It does so by not recycling them until after > issuing the completion callback which would reuse them by enqueueing > an URB and thus (re)allocating ISO DMA descriptors. > > Signed-off-by: David Brownell <[EMAIL PROTECTED]>
I tested this on PS3, and it seems to work OK. Acked-by: Geoff Levand <[EMAIL PROTECTED]> - To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
