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drm/exynos: iommu: add a check if all sub-devices have iommu controller

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This patch adds a check if all devices belonging to Exynos DRM have the
same dma_map_ops set. This is required to enable operation with IOMMU
enabled.

Signed-off-by: Marek Szyprowski <[email protected]>
Signed-off-by: Inki Dae <[email protected]>
This commit is contained in:
Marek Szyprowski 2016-06-17 09:54:24 +02:00 • committed by Inki Dae
commit c04d9eb773
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/exynos/exynos_drm_iommu.c
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@ -97,6 +97,11 @@ int drm_iommu_attach_device(struct drm_device *drm_dev,
if (!priv->mapping)
return 0;
if (get_dma_ops(priv->dma_dev) != get_dma_ops(subdrv_dev)) {
DRM_ERROR("Device %s lacks support for IOMMU\n",
dev_name(subdrv_dev));
return -EINVAL;
}
ret = configure_dma_max_seg_size(subdrv_dev);
if (ret)