Re: [PATCH v3 0/2] staging: dwc2: add microframe scheduler

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux