media: videobuf2: add begin/end cpu_access callbacks to dma-contig

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Provide begin_cpu_access() and end_cpu_access() callbacks for
cache synchronisation on exported buffers.

The patch also adds a new helper function - vb2_dc_buffer_consistent(),
which returns true is if the buffer is consistent (DMA_ATTR_NON_CONSISTENT
bit cleared), so then we don't need to sync anything.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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Sergey Senozhatsky 2020-05-14 18:01:49 +02:00 • committed by Mauro Carvalho Chehab

parent 093067ed12

commit d5adf1b0c2

1 changed files with 35 additions and 0 deletions

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drivers/media/common/videobuf2/videobuf2-dma-contig.c

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