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media: coda: request to skip kernel mapping for decoded buffers

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The kernel driver never touches the decoded buffers with the CPU.
All accesses are either done by hardware DMA masters or userspace
mapping the buffers. This means we don't need a kernel virtual
address mapping for those buffers at all. As those buffers are
usually quite large, we can save a good deal of kernel vmalloc
space by requesting to not have a kernel mapping set up for them.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Lucas Stach 2019-10-24 07:32:49 -03:00 committed by Mauro Carvalho Chehab
parent a3fd80198d
commit 3b299d9abf
1 changed files with 1 additions and 0 deletions
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drivers/media/platform/coda/coda-common.c
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@ -2387,6 +2387,7 @@ int coda_decoder_queue_init(void *priv, struct vb2_queue *src_vq,
dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
dst_vq->io_modes = VB2_DMABUF | VB2_MMAP;
dst_vq->dma_attrs = DMA_ATTR_NO_KERNEL_MAPPING;
dst_vq->mem_ops = &vb2_dma_contig_memops;
return coda_queue_init(priv, dst_vq);