Dear experts, We are using USB3.0 host with xHCI HCD driver. Our USB device Interface has two alternate settings. One with two endpoints and the other with four. When we try to configure it for alt setting “0”, we do not see any problem and it seems to work fine. However, when we are trying to configure our device to an alternate setting “1” we get an error reported back from xHCI saying ------------------------------------------------------- Endpoint state = 0x0 WARN urb submitted to disabled ep ------------------------------------------------------ This is leading us to the comments in xhci-ring.c as /* * USB core changed config/interfaces without notifying us, * or hardware is reporting the wrong state. */ Note: When we try to connect our device through EHCI, then everything seems to be working fine. Are there any implementation differences between USB 3.0 and USB 2.0 in terms of setting the alternate setting through the SET INTERFACE call? The kernel version we are using is 2.6.31.5. Thanks in advance, RD -- 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
