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drm/tegra: Optionally attach clients to the IOMMU
If a client is already attached to an IOMMU domain that is not the shared domain, don't try to attach it again. This allows using the IOMMU-backed DMA API. Since the IOMMU-backed DMA API is now supported and there's no way to detach from it on 64-bit ARM, don't bother to detach from it on 32-bit ARM either. Signed-off-by: Thierry Reding <treding@nvidia.com>
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Thierry Reding
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Oct 29, 2019
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