Starts ISOchronous mode on an OHCI controller. In fact it's a NEC USB 2.0 controller running in the full speed 12Mbit mode:
Aug 11 19:07:27 sauerkraut kernel: comedi0: usbdux: usb-device 0 is attached to comedi.
...a bit later:
Aug 11 19:10:00 sauerkraut kernel: Non-zero urb status received in ao intr context: -75
Dave: this is basically the same phenomenon I've told you for the ISO-in mode. In the ISO-in mode I have different execution times in the completion handler. If the time is short (basically only a resubmit) then I get also the -75 error after approx 5 mins. If the time spent in the completion handler is long I don't have this problem. I suspect that the same is true for the ISO out urb. I can add a usleep just to give it a try.
I have no problems with uhci controllers. Seems to be somthing ohci specific. Maybe at the moment I resubmit the urb the controller might still hold the data from the former transfer...???
/Bernd
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?
/Bernd
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