thanks. I added a udelay(100) in my handler. Then the problem is "solved" and I don't get any error msgs. I'll look in the ohci specs. Thanks for the hint.
Actually the bus was not very busy, I think. I started the driver and left the computer basically idle. The errror happens on both a 500Mhz processor and on a 2GHhz processor. Both USB interfaces are OHCI. On my 500Mhz system I can switch over to UHCI and there's no problem.
/Bernd
David Brownell wrote:
Bernd Porr wrote:
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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