drm/sun4i: mixer: Call of_dma_configure if there's an IOMMU
The main DRM device is actually a virtual device so it doesn't have the iommus property, which is instead on the DMA masters, in this case the mixers. Add a call to of_dma_configure with the mixers DT node but on the DRM virtual device to configure it in the same way than the mixers. Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/9a4daf438dd3f2fe07afb23688bfb793a0613d7d.1589378833.git-series.maxime@cerno.tech (cherry picked from commit b718102d) [Maxime: Applied to -fixes since it missed the merge window and display is broken without it] Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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