linux-kernel - Re: [PATCH 1/1] ARM: exynos_defconfig: Disable IOMMU support

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Date:	Tue, 03 Mar 2015 12:36:08 -0800
From:	Kevin Hilman <khilman@...nel.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Kukjin Kim <kgene@...nel.org>, Olof Johansson <olof@...om.net>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Andreas Faerber <afaerber@...e.de>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	tyler.baker@...aro.org
Subject: Re: [PATCH 1/1] ARM: exynos_defconfig: Disable IOMMU support

Javier Martinez Canillas <javier.martinez@...labora.co.uk> writes:

> Enabling Exynos DRM IOMMU support for Exynos is currently broken and
> causes a BUG on exynos-iommu driver. This was not an issue since the
> options was disabled in exynos_defconfig but after commit 8dcc14f82f06
> ("drm/exynos: IOMMU support should not be selectable by user"), it is
> selected if EXYNOS_IOMMU is enabled which is in exynos_defconfig.
>
> So a kernel built using exynos_defconfig after the mentioned commit
> fails to boot [0]. Disable IOMMU support in Exynos defconfig until
> things get sorted out.

So some other exynos boards started failing in next-20150303[1], and
appear are DRM failures.

Interestingly, (re)enabling CONFIG_EXYNOS_IOMMU for these cause things to
work again.  Even more intersting, with IOMMU enabled, peach-pi is 

I'm starting to think it's the DRM driver that needs to be disabled
until it actually gets some testing, rathre than disabling IOMMU.

Kevin

[1] http://kernelci.org/boot/?next-20150303&fail
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