Re: [PATCH 14/16] USB: Add usbfs ioctl to get the frame number
Laurent Pinchart <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Tuesday 15 May 2007, Alan Stern wrote: > On Tue, 15 May 2007, Laurent Pinchart wrote: > > I was just wondering if the USB host controller issued an interrupt when > > sending an SOF token. If so, it would be quite easy to store the current > > host timestamp there. If not, I'll live with it. > > It can if you want it to. Most of the time we don't want it. Imagine > trying to live with an interrupt request each and every millisecond! > (Or 8 interrupts every millisecond for high-speed.) That would be a power saving nightware. I guess all dynticks developers would kill me :-) I'll for for statistical processing on the SOF counter and host timestamp values then. Laurent Pinchart ------------------------------------------------------------------------- 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