On Sun, 31 Oct 2010, Gavin Guo wrote: > After reading section 4.8 of EHCI spec again. I have another question: > Does HC will increase the asynclistaddr to next QH which follow the QH > of which H bit set to 1?? You mean, does it do this when it stops following the schedule? No, it doesn't. > I read the code in qh_link_async() adding > the new queue after the ehci->async. So I think it is not possible to > restart the asynchronous when the sleep timer expires without > advancing to next QH. If doesn't, HC will read the same QH of H = 1 > and sleep again. It won't sleep again right away, because when the schedule restarts the Reclamation bit is set to 1. See 4.8.3. Alan Stern -- 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
