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SubjectRe: [PATCH 1/1] ARM: exynos_defconfig: Disable IOMMU support
Javier Martinez Canillas <> 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.



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