linux-kernel - Re: Odd 'unable to find transceiver' messages from USB with v3.13-3260-g03d11a0 and later

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Message-ID: <CA+5PVA5XSQY8GpwpPfQXr_JWM+wBqD2dHK4vxMJZP6Yq1U2EKg@mail.gmail.com>
Date:	Fri, 24 Jan 2014 15:31:04 -0500
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	balbi@...com
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	valentine.barshak@...entembedded.com
Subject: Re: Odd 'unable to find transceiver' messages from USB with
 v3.13-3260-g03d11a0 and later

On Fri, Jan 24, 2014 at 2:08 PM, Felipe Balbi <balbi@...com> wrote:
> Hi,
>
> On Fri, Jan 24, 2014 at 08:47:07AM -0500, Josh Boyer wrote:
>> 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?
>
> looks like it was caused because of this commit:
>
> commit 1ae5799ef63176cc75ec10e545cb65f620a82747
> Author: Valentine Barshak <valentine.barshak@...entembedded.com>
> Date:   Wed Dec 4 01:42:22 2013 +0400
>
>     usb: hcd: Initialize USB phy if needed

Yeah, I'm pretty sure my bisect agrees with you.

> usb_get_phy_device() will pr_err() when a PHY isn't found. Looks like
> that should be pr_debug() since everything still works even without a
> PHY.

Seems correct.  Who should write up the patch?

josh
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