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 <m.szyprowski@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_iommu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
index 1e82529..36dde96 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
@@ -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)
--
1.9.2
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