On Tue, 16 Nov 2010, Amit Nagal wrote: > >> if error recovery is possible , such recovery can be done from which part : > >> > >> usb host controller or audio class driver ? > > > > Neither one. Nothing needs to be done; recovery is automatic. > > > > Alan Stern > > > > > > Thanx for the reply . i have a doubt . > SInce iso tranfers provide error detection via CRC but no retry or > guarantee of delievery , > how recovery is automatic in case of usb iso transfers ? Recovery is completely automatic. However you should realize that recovery != retransmission. The host recovers and continues, but the original data is lost. > In my case host controller also reports device disconnect in PORTSC > register at this error condition also . > is it normal behaviour on part of usb host controller to report device > disconnect if usb isochoronous > transactions fails with such errors such as bad length ? You've got it backward. It is normal behavior for transactions to fail with these errors if the device disconnects. 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
