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drm/rockchip: Set VOP for the DRM DMA device

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Use VOP for DMA operations performed by DRM core. Rockchip DRM driver
is backed by a virtual device that isn't IOMMU-capable, while VOP is the
actual display controller device backed by IOMMU. Fixes "swiotlb buffer
is full" warning messages originated from GEM prime code paths.

Note, that backporting is non-trivial as this depends on
commit 143ec8d3f9 ("drm/prime: Support dedicated DMA device for dma-buf
imports"), which landed in v6.16 and commit 421be3ee36 ("drm/rockchip:
Refactor IOMMU initialisation"), which landed in v5.19.

Reported-by: Daniel Stone <daniels@collabora.com>
Fixes: 2048e3286f ("drm: rockchip: Add basic drm driver")
Cc: stable@vger.kernel.org # v6.16+
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Tested-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20251022161948.199731-1-dmitry.osipenko@collabora.com
This commit is contained in:
Dmitry Osipenko 2025-10-22 19:19:48 +03:00 committed by Heiko Stuebner
parent e95b9ff6bf
commit 7d7bb790ac
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/rockchip/rockchip_drm_drv.c
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@ -97,6 +97,9 @@ void rockchip_drm_dma_init_device(struct drm_device *drm_dev,
private->iommu_dev = ERR_PTR(-ENODEV);
else if (!private->iommu_dev)
private->iommu_dev = dev;
if (!IS_ERR(private->iommu_dev))
drm_dev_set_dma_dev(drm_dev, private->iommu_dev);
}
static int rockchip_drm_init_iommu(struct drm_device *drm_dev)