Hello, We have an issue where we cannot communicate with an old device with a wMaxPacketSize set to 0xFFFF. It is visible using lsusb -v and shows the correct max packte size, but is not listed in lsusb -t. The dmesg output gives us "usb 2-2.1: Not enough bandwidth for new device state. " and this comes from xhci (in particular xhci.c in the xhci_configure_endpoint_result function). When we set the max packet size on the device to something more reasonable (i.e. a0) the errors go away and we are able to communicate with it.
We would like to patch the xhci host driver to change any FFFF max packet sizes to a0, but are having trouble finding where exactly to do so. We've identified the function xhci_urb_enqueue as a possible point, but printing out the max packet sizes (hw_max_packet_size and max_packet_size) only shows sizes of 8. Unfortunately, changing the configuration on the device itself is not an option. Any advice would be appreciated! Thanks, Todd -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
