linux-kernel - Re: [PATCH v2 3/5] pinctrl: exynos: Fix GPIO setup failure because domain clock being gated

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Message-id: <1417183724.18249.36.camel@AMDC1943>
Date:	Fri, 28 Nov 2014 15:08:44 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Mike Turquette <mturquette@...aro.org>,
	Kukjin Kim <kgene@...nel.org>,
	linux-samsung-soc <linux-samsung-soc@...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>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Vivek Gautam <gautam.vivek@...sung.com>,
	Kevin Hilman <khilman@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v2 3/5] pinctrl: exynos: Fix GPIO setup failure because
 domain clock being gated

On pią, 2014-11-28 at 15:04 +0100, Linus Walleij wrote:
> On Wed, Nov 26, 2014 at 3:24 PM, Krzysztof Kozlowski
> <k.kozlowski@...sung.com> wrote:
> 
> > The audio subsystem on Exynos 5420 has separate clocks and GPIO. To
> > operate properly on GPIOs the main block clock 'mau_epll' must be
> > enabled.
> >
> > This was observed on Peach Pi/Pit and Arndale Octa (after enabling i2s0)
> > after introducing runtime PM to pl330 DMA driver. After that commit the
> > 'mau_epll' was gated, because the "amba" clock was disabled and there
> > were no more users of mau_epll.
> >
> > The system hang just before probing i2s0 because
> > samsung_pinmux_setup() tried to access memory from audss block which was
> > gated.
> >
> > Add a clock property to the pinctrl driver and enable the clock during
> > GPIO setup. During normal GPIO operations (set, get, set_direction) the
> > clock is not enabled.
> >
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> 
> Waiting for Tomasz to review this.
> 
> Can this patch be applied in separation from the others?

Yes, it can be picked independently.

The commit message is somehow misleading because issue is actually fixed
by enabling this in DTS. So the next patch (4/5: ARM: dts: exynos5420:
Add clock for audss pinctrl) actually fixes the issue on Arndale Octa
board from pinctrl perspective. Unfortunately I spot that mistake (in
commit msg) later...

Best regards,
Krzysztof


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