[media] vb2: use dma_map_sg_attrs to prevent unnecessary sync

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By default dma_map_sg syncs the mapped buffer to the device. But
buf_prepare expects a buffer syncs for the cpu and the buffer
will be synced to the device in the prepare memop.

The reverse is true for dma_unmap_sg, buf_finish and the finish
memop.

To prevent unnecessary syncs we ask dma_(un)map_sg to skip the
sync.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

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Hans Verkuil 2014-11-18 09:51:08 -03:00 • committed by Mauro Carvalho Chehab

parent f5294f455a

commit 251a79f8f5

2 changed files with 47 additions and 10 deletions

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24

drivers/media/v4l2-core/videobuf2-dma-contig.c

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33

drivers/media/v4l2-core/videobuf2-dma-sg.c

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