> From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] > Sent: Monday, March 12, 2012 2:06 PM > > On Mon, 12 Mar 2012, Paul Zimmerman wrote: > > > This adds support for isochronous endpoints to gadget zero and > > the usbtest module. > > > > We have used something similar to this for testing our super > > speed device and host controllers, but it would be easier (and > > require less support) to have this in the mainline kernel. > > > > Does this look like the right approach? I know the zero gadget > > is supposed to be very simple, and this complicates it a bit. > > But making a separate gadget for this would require duplicating > > quite a bit of code, I think. At least I don't see a clean way > > to make the isoc support modular and optional. > > > > I have tested this with the Synopsys device and host, at high > > speed and super speed. It still needs testing with a UDC that > > doesn't support super speed or isoc, to make sure the simple > > case is not broken. > > > > Comments? > > Wasn't something like this discussed (and patches submitted) a long > time ago? I don't remember what happened with them. > > Anyway, it's possible to do this sort of testing already by using > gadgetfs with the "usb.c" test program, if you compile it with the > -DAIO option. Hmm, I see. Is gadget zero considered obsolete then, if everything can be done using usb.c and gadgetfs? I wonder why gadget zero is still maintained? It has support for super speed, for example, while gadgetfs does not. Do you think there could be a problem moving data at high- bandwidth super speed rates (48K bytes every 125 usec) using gadgetfs? -- paul -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
