linux-kernel - Re: Regression in next with gpiolib

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Message-ID: <20170831140221.GK6008@atomide.com>
Date:   Thu, 31 Aug 2017 07:02:21 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Timur Tabi <timur@...eaurora.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>
Subject: Re: Regression in next with gpiolib

* Linus Walleij <linus.walleij@...aro.org> [170830 22:59]:
> On Wed, Aug 30, 2017 at 11:41 PM, Tony Lindgren <tony@...mide.com> wrote:
> 
> > Hi Timur, Linus & Grygorii,
> >
> > Looks like commit 108d23e322a2 ("gpiolib: request the gpio before
> > querying its direction") caused a regression on at least pandaboard
> > es with booting hanging shortly after gpio init.
> >
> > It seems to be that we're now calling request and free on all gpios
> > before they are properly configured?
> >
> > I narrowed the hang down to gpio bank1 lines 7 and possibly 8 where
> > not calling omap_gpio_free() on them makes the system boot again.
> >
> > These lines are used for the leds in omap4-panda-common.dtsi, and
> > omap_gpio_free() will by default set the unused lines for input
> > and bad things happen. I guess hardware failure could also happen
> > although I have not seen it here.
> >
> > It seems a similar issue can exist on other platforms too,
> > so it's probably a good idea to revert this for now.
> 
> I reverted it for now.

OK thanks!

Tony