Re: Device failing to enumerate with EHCI
David Brownell <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Friday 23 March 2007 9:11 am, Alan Stern wrote: > We don't clear the halt because the host is never supposed to clear halts > on ep0. If the halt is a "protocol stall" (the normal case) then the > device will clear it automatically when it receives the next SETUP packet. > If the halt is a "functional stall" (discouraged by the USB spec) yes ... > there > is no way to clear it -- the Clear-Halt request won't get through because > ep0 is halted! ... no, that's a special case. Oddball devices that implement halt status on ep0 must allow clear-halt requests for it too. See 8.5.3.4 and (especially) the end of 9.4.5 ... Linux "should" handle such oddball devices. Is it clear that this is one of those cases? - Dave ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel