Re: Support for USBD_FORCE_SHORT_XFER for xhci

Jason Thorpe <[email protected]>
Newsgroups gmane.os.netbsd.devel.kernel
Message-ID <[email protected]> 

> On Aug 22, 2025, at 10:06 AM, Nat Sloss <[email protected]> wrote:
> 
> Hi,
> 
> I've done recent work on urtwn that fixes transfers when the device is used 
> with xhci.
> 
> It turns out the root of the problem was a lack of support in the xhci stack 
> for the flag USBD_FORCE_SHORT_XFER.

Related to this: What about USBD_SHORT_XFER_OK?  It’s effectively the inbound direction of USBD_FORCE_SHORT_XFER.  This seems to have some special handling in uhci, and I’m wondering if this is related to the issues I’ve been having with TL866II “minipro” EEPROM programmers on xhci on NetBSD.

-- thorpej
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