linux-kernel - RE: [PATCH 1/1] ARM: dts: Make DP a consumer of DISP1 power domain on Exynos5420

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Date:	Thu, 30 Apr 2015 09:36:23 +0900
From:	Kukjin Kim <kgene@...nel.org>
To:	'Javier Martinez Canillas' <javier.martinez@...labora.co.uk>,
	'Kukjin Kim' <kgene@...nel.org>
Cc:	'Doug Anderson' <dianders@...omium.org>,
	'Olof Johansson' <olof@...om.net>,
	'Krzysztof Kozlowski' <k.kozlowski@...sung.com>,
	'Andrzej Hajda' <a.hajda@...sung.com>,
	'Kevin Hilman' <khilman@...aro.org>,
	'Tyler Baker' <tyler.baker@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH 1/1] ARM: dts: Make DP a consumer of DISP1 power domain on
 Exynos5420

Javier Martinez Canillas wrote:
> 
> Hello Kukjin,
> 
Hi,

> On 04/16/2015 09:40 AM, Javier Martinez Canillas wrote:
> >
> > On 04/12/2015 10:30 PM, Javier Martinez Canillas wrote:
> >> Commit ea08de16eb1b ("ARM: dts: Add DISP1 power domain for exynos5420")
> >> added a device node for the Exynos5420 DISP1 power domain but dit not
> >> make the DP controller a consumer of that power domain.
> >>
> >> This causes an "Unhandled fault: imprecise external abort" error if the
> >> exynos-dp driver tries to access the DP controller registers and the PD
> >> was turned off. This lead to a kernel panic and a complete system hang.
> >>
> >> Make the DP controller device node a consumer of the DISP1 power domain
> >> to ensure that the PD is turned on when the exynos-dp driver is probed.
> >>
> >> Fixes: ea08de16eb1b ("ARM: dts: Add DISP1 power domain for exynos5420")
> >> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> >
> > Any comments about this patch?
> >
> > It's very trivial but fixes a very important regression on Exynos5420 boards
> > with display panel and Peach Pit and Pi have been broken since next-20150401.
> >
> > This [0] is the Peach Pit boot log with yesteday's linux-next for example.
> >
> > Best regards,
> > Javier
> >
> > [0]: http://arm-soc.lixom.net/bootlogs/next/next-20150415/pit-arm-exynos_defconfig.html
> >
> 
> It has been many weeks since this patch has been posted and linux-next
> is still broken:
> 
> http://arm-soc.lixom.net/bootlogs/next/next-20150429/pi-arm-exynos_defconfig.html
> 
> Could you please apply $subject to fix the imprecise external abort issue.
> 
Sure I'll in this weekend.

Thanks for your gentle reminder ;-)

- Kukjin

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