linux-kernel - Re: Regression: usb serial gadget on sama5d3 broken

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Message-ID: <38ca0db7-9bc6-7258-b102-ea9fdeb9b03c@atmel.com>
Date:   Mon, 17 Oct 2016 16:54:21 +0200
From:   Nicolas Ferre <nicolas.ferre@...el.com>
To:     Peter Rosin <peda@...ntia.se>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: Re: Regression: usb serial gadget on sama5d3 broken

Le 17/10/2016 à 14:53, Peter Rosin a écrit :
> Hi!
> 
> I'm suffering from a regression while using the usb gadget port on the
> sama5d3 to get terminal access to the device in question (CONFIG_USB_G_SERIAL).
> 
> I get this message when I try to connect:
> udc: ep: Invalid setup request: 02.01 v0000 i0081 l0, halting endpoint...
> 
> A bisect blames commit v4.7-rc1-21-gc32b5bcfa3c4 "ARM: dts: at91: Fix
> USB endpoint nodes".
> 
> And indeed, reverting that commit on top of v4.9-rc1 fixes things,
> although that doesn't look like the best of fixes...
> 
> BTW, the bisect was extremely painful since v4.7-rc1 seemed broken
> somewhere in the overlayfs area. I hope I will never ever need to bisect
> in the v4.6..v4.7 area again. This was the second time, the first time
> I was chasing a gpio interrupt bug, but I never found out what was wrong
> and stopped looking when v4.9-rc1 turned out to be ok even though v4.8
> was bad, it was just too painful to look for things that already seemed
> fixed.

I guess that you are referring to the regression listed here:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1239220.html

The patch is available and will hopefully land in an official kernel
soon (4.8.1) as said by Felipe and Greg.

Sorry for the inconvenience. Best regards,
-- 
Nicolas Ferre