On 03/27/2014 12:31 PM, Keerthy V wrote:
Hi,
I am trying to send data to a USB device connected to a USB3.0 port over a USB bulk end point using libusb APIs . It is failing failed with error ERROR_IO.
The same device and the test program works fine on a USB2.0 port.
After enabling the XHCI debug options, I found that I am getting the following errors:
"Endpoint xxx not halted, refusing to reset Transfer error on endpoint"
I have tested in following kernel :
3.13.7
3.11.0-18
Both gave the same results. The test has been performed on USB 3.0 host controller.
Can you please let me know the root cause and possible solutions?
Attached is the debug log.
Hi
xhci currently refuses to reset non-halted endpoints. Turns out that in
some cases reset endpoint is used as a "soft reset" for non halted
endpoint and we should do a configure-endpoint instead. I'll start
working on that once other work is completed
But in your case the error this message is probably just a symptom of
some other cause.
Without the actual debug log (please remember to attach) it's difficult
to say anything. A really wild guess is that it might be Powermanagement
related (USB3 LPM) but that is just because we've seen other IO error
issues where we suspect LPM.
-Mathias
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