[PATCH v1] drm/rockchip: Set VOP for the DRM DMA device

[Cristian Ciocaltea]

On 10/22/25 7:19 PM, Dmitry Osipenko wrote:
> 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 143ec8d3f9396
> ("drm/prime: Support dedicated DMA device for dma-buf imports"), which
> landed in v6.16 and 421be3ee36a4 ("drm/rockchip: Refactor IOMMU
> initialisation"), which landed in v5.19.
> 
> Reported-by: Daniel Stone <daniels at collabora.com>
> Fixes: 2048e3286f34 ("drm: rockchip: Add basic drm driver")
> Cc: stable at vger.kernel.org # v6.16+
> Reviewed-by: Sebastian Reichel <sebastian.reichel at collabora.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko at collabora.com>
> ---

With the patch applied I'm not able to fire those warnings anymore - tested on
my ROCK 5B (RK3588) and ROCK 4D (RK3576) boards.  Hence you may add:

Tested-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>