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

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Date:   Mon, 17 Oct 2016 14:53:05 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        "Jean-Christophe Plagniol-Villard" <plagnioj@...osoft.com>,
        Nicolas Ferre <nicolas.ferre@...el.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Regression: usb serial gadget on sama5d3 broken

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.

Cheers,
Peter