Re: rx errors reported by usbnet
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Fri, 25 May 2007, Yum Rayan wrote: > We checked the USB cable and protocol on the wire and everything looks > good. The USB device that is connected to the hosts looks fine well. > > Finally we see this in the NXP ISP1563_Errata_070417: > > "Afer receiving a continous series of NAKs, ranging from 150 ms to 500 > ms, the ISP1563 will retun a condition code 06h (PID failure) in the > general Transfer Descriptor (TD). This error causes the software to > stall the endpoint" "The workaround is to provide a software patch. > The HCD can be modified so that whenever a PID check failure occurs, > the HCD will not inform the client driver. Instead it just resubmits > the TD on its own and the transaction continues". > > Is there exisiting code that demonstrates how to resubmit a TD? The > suggested workaround does not seem good design. Any ideas? There is no demonstration code for resubmitting a TD, as far as I know. You'll have to try writing your own. You're right that the workaround doesn't seem like a good design. What would happen when a real PID error occurs? Admittedly this is highly unlikely. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel