On Fri, Jun 29, 2012 at 12:49:39PM -0700, Gary E. Miller wrote: > Yo Sarah! > > I see you are the maintainer for the XHCI subsystem. Thanks for doing > that. > > I keep getting this message on recent kernels: > > xhci_hcd 0000:03:00.0: WARN Successful completion on short TX: needs XHCI_TRUST_TX_LENGTH quirk? Yep, that means your host controller is giving software conflicting data. The successful completion status tells us the data from the device was received fine, but then the "untransferred length" field says that some of the data wasn't received. On a short transfer from the device, the host is supposed to pass a short transfer completion code. With the XHCI_TRUST_TX_LENGTH quirk, we will trust the untransferred length, not the completion status. That's what we've found several Fresco Logic host controllers need, so you may need the same quirk. > My kernel is 3.4.4-gentoo. > > 0000:03:00.0 is: > > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 9 Hub > bDeviceSubClass 0 Unused > bDeviceProtocol 1 Single TT > bMaxPacketSize0 64 > idVendor 0x1d6b Linux Foundation > idProduct 0x0002 2.0 root hub > bcdDevice 3.04 > iManufacturer 3 Linux 3.4.4-gentoo xhci_hcd > iProduct 2 xHCI Host Controller > iSerial 1 0000:03:00.0 > bNumConfigurations 1 Can you send me the output of `sudo lspci -vvv` and `sudo lspci -vvv -n`? I need to know the PCI vendor and device ID for your xHCI host controller. > Any idea what I should do with this WARN? I would love to get my USB 3.0 > stable. I'll add a patch that says your host controller needs the XHCI_TRUST_TX_LENGTH quirk. Then we'll ignore the successful completion and trust the untransferred length instead. 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
