On Thu, 3 Oct 2013, Robert Baldyga wrote: > > This disagrees with the kerneldoc for usb_ep_autoconfig(). For bulk > > endpoints, wMaxPacket is always supposed to be set to the full-speed > > value, regardless of what the protocol driver specifies. > > Hmm, it looks like all gadgets calls usb_ep_autoconfig() for full speed > descriptors and after it they uses usb_assign_descriptors() function to > set descriptors proper for device speed. Also, the gadgets have the wMaxPacketSize value hard-coded for the HS and SS descriptors. > And it works until gadget sets > full speed descriptors. But what if gadget supports only high speed and > don't want to set full speed descriptors? If it will use > usb_ep_autoconfig() function for high speed descriptor, value of > wMaxPacketSize field will change to 64. Is there any good solution for > this problem or all gadgets have to support full speed? The gadget driver can change wMaxPacketSize back to the correct value after calling usb_ep_autoconfig(). Or you can change the definition of usb_ep_autoconfig(), and have the driver pass the speed value as an additional argument. Alan Stern -- 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
