Hi!
I get occaisonally the error flag USB_ST_DATAOVERRUN when the interrupt handler is called with an ISO-out transmission. This only happens with the ohci driver. Especially strange that it happens in the interrupt handler and with ISO which has no ACK.
Any ideas?
How busy is your PCI bus? Have a look at the OHCI spec; in section 4.3.2.3.5 there's information about such faults.
It's possible this a case where OHCI is telling you about faults that other HCs mask from you ... like the system being so busy that ISO service intervals can't be met. But that explanation doesn't match the behavior you saw with short completion handlers for ISO-IN. I'd hope that some of the specific fault descriptions in that documentation would help get your answer.
- Dave
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