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Re: kern/54070: urtwn(4) does not work on OHCI
The following reply was made to PR kern/54070; it has been noted by GNATS.
From: Nick Hudson <nick.hudson%gmx.co.uk@localhost>
To: Andreas Gustafsson <gson%gson.org@localhost>
Subject: Re: kern/54070: urtwn(4) does not work on OHCI
Date: Wed, 27 Nov 2019 20:11:51 +0000
On 27/11/2019 07:48, Andreas Gustafsson wrote:
> Nick Hudson wrote:
>> What is the error code OHCI_CC_DATA_UNDERRUN?
>> Maybe OHCI_TD_R should be used more?
> I think then we would run into the issue discussed in the following
> quote from http://www.fysnet.net/docs/vol8_future.pdf:
> "If this bit is set, the controller will mark the TD as a successful
> transfer, however, the controller will continue on to the next TD
> pointed to by the NextTD field. Continuing to the next TD may not be
> what you planned on."
Ok, I see that you're trying to implement the recommendation in the PDF.
I think it's best to remove OHCI_TD_R completely for bulk/interrupt
I haven't thought about control transfers though.
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