On 07/22/14 18:46, Paul Zimmerman wrote:
The nak_frame handling would have added some benefit, but wouldn't handle all
cases.
I'm seeing problems with devices NAKing to the point of confusing dwc2 completely,
so I'd like to investigate a NAK holdoff scheme that's acceptable for dwc2. I
suspect the best thing to do here is to add a nak_count field to dwc2_qh (or maybe
dwc2_qtd) and increment in dwc2_hc_nak_intr. If the count exceeds a threshold
then it would call
dwc2_halt_channel(hsotg, chan, qtd, DWC2_HC_XFER_NAK);
and go around again.
I assume the NAK count would need resetting everywhere qtd->error_count is reset.
How does this sound?
Sounds good to me. BTW, can you give me a pointer to one of the devices
that gives excessive NAKs? I would like to buy one for the lab here to
test with.
I'm seeing problems with a d-link dwcl-g122 wifi dongle that someone
sent me.
There are reports of other wifi dongles with the same/similar problem.
Nick
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