media/rpivid: Allow use of iommu in rpivid
In order to use iommu on hevc set dma mask_and_coherent in probe.
I am assured dma_set_mask_and_coherent is benign on Pi4 (which has
no iommu) and it seems to be so in practice.
Also adds a bit of debug to make internal buffer allocation failure
easier to spot in future
Signed-off-by:
John Cox <jc@kynesim.co.uk>
parent
450d6177
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