>> Change the enumeration scheme for xhci attached devices from: >> >> SetAddress >> GetDescriptor(8) >> GetDescriptor(18) >> >> ...to: >> >> GetDescriptor(64) >> SetAddress >> GetDescriptor(18) >> >> ...as some devices misbehave when encountering a SetAddress command >> prior to GetDescriptor. There are known devices that require this >> enumeration scheme but is unknown how much, if any, regression there >> will be of xhci-attached devices that can not tolerate the change. For >> now, follow the ehci case and enable 'new scheme' by default. Of course >> the existing 'old_scheme_first' and 'use_both_schemes' usbcore module >> parameters are available to debug / workaround regressions. >> >> To support this enumeration scheme on xhci the AddressDevice operation >> needs to be performed twice. The first instance of the command enables >> the HC's device and slot context info for the device, but omits sending >> the device a SetAddress command (BSR == block set address request). >> Then, after GetDescriptor completes, follow up with the full >> AddressDevice+SetAddress operation. >> >> Reported-by: David Moore <david.moore@xxxxxxxxx> >> Suggested-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> >> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> >> --- > > Hold off on this one for now... debugging a case where xhci complains > that the slot is not in the enabled state when receiving the address > device (bsr=1) request. Is there a commit id for this, please? and, where can I find this patch? I would like to try this on my machine as I have a device that does not enumerate on xhci only. Thanks Joe -- 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
