On Tue, Dec 18, 2012 at 10:14:52AM -0500, Alan Stern wrote: > On Mon, 17 Dec 2012, Sarah Sharp wrote: > > > Alan, what does the EHCI scheduler do if the HS device's wMaxPacketSize > > is set to 64 bytes? Happily schedule 64 byte transfers? Or will it > > schedule 512 byte packets since that's the only allowed type for HS bulk > > endpoints? > > I don't know -- I assume it will never come up. When people use bulk > endpoints with these bogus maxpacket sizes, they never do any transfers > longer than one packet. > > > I can unconditionally set the HS bulk wMaxPacketSize to 512 bytes, but > > I'm not sure that will work with this device. > > It should if the transfers are never more than 64 bytes long. Or if > there are no transfers to that endpoint. > > Question: Should the maxpacket change be made in xhci-hcd or in > usbcore? It should probably be made in the USB core, where it's more visible. Vincent, I'll send you a patch tomorrow that should work around the illegal maxpacket size. Your other USB devices probably don't have this issue, so you probably don't need to test with them. Sarah Sharp -- 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
