Hello Krzysztof,
On 11/10/2015 09:43 PM, Krzysztof Kozlowski wrote:
[snip]
>
>
> BTW, do you know why we don't have EXYNOS_IOMMU enabled in defconfig?
> Any reasons against?
>
It was explicitly disabled by commit 6562f3bd396a ("ARM: exynos_defconfig:
Disable IOMMU support") because Exynos IOMMU support was broken and caused
a BUG on boot, the discussion of the patch is [0].
But I just tested booting a v4.4-rc2 kernel on an Exynos5800 Peach Pi with
Exynos IOMMU enabled and the machine boots, display is working and
/sys/kernel/iommu_grups/*/devices shows that the devices were correctly
attached to an IOMMU group so things seems to have been sorted out now.
So it seems that EXYNOS_IOMMU could be enabled again. It would be good to
give such a patch a spin at kernelci before posting IMHO though just to be
sure there are no issues remaining.
> Best regards,
> Krzysztof
>
>
[0]: https://lkml.org/lkml/2015/2/17/163
Best regards,
--
Javier Martinez Canillas
Open Source Group
Samsung Research America
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