Hi, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> writes: > On Mon, 2 May 2016, Mathias Nyman wrote: > >> The current implemenentation restart the sent pattern for each entry in >> the sg list. The receiving end expects a continuous pattern, and test >> will fail unless scatterilst entries happen to be aligned with the >> pattern > > Ah. We didn't spot this earlier because for non-xHCI controllers, the > scatterlist entries _must_ be aligned with the maxpacket size and > therefore with the pattern. interesting. We actually found a similar issue with XHCI. scatterlist has to be aligned to wMaxPacketSize but only before a link TRB. Mathias has been working on a solution which involves memcpy()ing enough bytes to align to wMaxPacketSize before the link TRB (it's very infrequent as we have 256 TRBs per segment on XHCI), but if you know of a nicer way, we're all ears :-) /me goes dig EHCI -- balbi
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