On Mon, 16 Jul 2012, Ingo Rohloff wrote: > Hello, > > I have some problems with an ASM1042 SuperSpeed Host Controller. > (IvyBridge + PantherPoint Motherboard). > I also read some comments that this particular Host Controller might have some problems, but I could > not find any details. > Each URB tries to read up to 0x4000 bytes from Endpoint 0x85. > The device should send 0x2FFE bytes. > My assumption was, that every 12th packet only contains 0x3FE bytes and thus stops the currently > active URB. > > It seems the ASM1042 sometimes does not stop the transfer after receiving a short packet, or at > least the URB continues (stopping after 16KByte). > > QUESTION: Is this a known problem or am I doing something wrong ? See http://marc.info/?l=linux-usb&m=134236551409964&w=2 Apparently the ASM1042 reports that a transfer completed normally even when it was short (or when it was cancelled). xHCI controllers in general do not stop transfers after receiving a short packet. Apparently there's no way to tell them to stop under those circumstances. 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
