Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752982AbaAXNrM (ORCPT ); Fri, 24 Jan 2014 08:47:12 -0500 Received: from mail-oa0-f54.google.com ([209.85.219.54]:53519 "EHLO mail-oa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752481AbaAXNrI (ORCPT ); Fri, 24 Jan 2014 08:47:08 -0500 MIME-Version: 1.0 Date: Fri, 24 Jan 2014 08:47:07 -0500 X-Google-Sender-Auth: oOHg_f-rE7hfEupImSE2rbngSNo Message-ID: Subject: Odd 'unable to find transceiver' messages from USB with v3.13-3260-g03d11a0 and later From: Josh Boyer To: balbi@ti.com, Greg KH , stern@rowland.harvard.edu Cc: linux-usb@vger.kernel.org, "Linux-Kernel@Vger. Kernel. Org" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi All, We've had a report [1] of the USB layer throwing out 'unable to find transceiver' messages during boot with the 3.14 merge window kernels. I've seen this on my personal machine as well and included the dmesg section below. This does not happen with the 3.13 kernel. There are only a handful of files in git that have that error, but I haven't seen anything that immediately strikes me as causing this. >From the dmesg output it looks like it is spit out right before a host controller is registered? USB seems to be still working OK in my minimal testing, so the error message is confusing. Thoughts? [1] https://bugzilla.redhat.com/show_bug.cgi?id=1057529 josh [ 1.683368] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 1.683386] ehci-pci: EHCI PCI platform driver [ 1.684765] unable to find transceiver [ 1.684993] ehci-pci 0000:00:1a.0: EHCI Host Controller [ 1.685772] ehci-pci 0000:00:1a.0: new USB bus registered, assigned bus number 1 [ 1.685847] ehci-pci 0000:00:1a.0: debug port 2 [ 1.689837] ehci-pci 0000:00:1a.0: cache line size of 64 is not supported [ 1.689976] ehci-pci 0000:00:1a.0: irq 16, io mem 0xfe707000 [ 1.695158] ehci-pci 0000:00:1a.0: USB 2.0 started, EHCI 1.00 [ 1.695721] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 [ 1.695722] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 1.695724] usb usb1: Product: EHCI Host Controller [ 1.695725] usb usb1: Manufacturer: Linux 3.14.0-0.rc0.git7.1.fc21.x86_64 ehci_hcd [ 1.695726] usb usb1: SerialNumber: 0000:00:1a.0 [ 1.697752] hub 1-0:1.0: USB hub found [ 1.697872] hub 1-0:1.0: 2 ports detected [ 1.701620] unable to find transceiver [ 1.701847] ehci-pci 0000:00:1d.0: EHCI Host Controller [ 1.702424] ehci-pci 0000:00:1d.0: new USB bus registered, assigned bus number 2 [ 1.702458] ehci-pci 0000:00:1d.0: debug port 2 [ 1.706417] ehci-pci 0000:00:1d.0: cache line size of 64 is not supported [ 1.706538] ehci-pci 0000:00:1d.0: irq 23, io mem 0xfe706000 [ 1.712160] ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/