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Host1x is getting attached to an implicit IOMMU DMA domain if CONFIG_ARM_DMA_USE_IOMMU=y. Since Host1x driver manages IOMMU by itself, Host1x device must be detached from the implicit domain using arch-specific IOMMU-API. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>