[media] media: ti-vpe: vpdma: Use bidirectional cached buffers

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VPDMA buffer will be used by CPU as well as by the VPDMA.
CPU will write/update the VPDMA descriptors containing data
about the video buffer DMA addresses.
VPDMA will write the "write descriptor" containing the
data about the DMA operation.

When mapping/unmapping the buffer, driver has to take care of
WriteBack and invalidation of the cache so that all the
coherency is maintained from both directions.

Use DMA_BIDIRECTIONAL to maintain coherency between CPU and VPDMA.

Signed-off-by: Nikhil Devshatwar <nikhil.nd@ti.com>
Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

...

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Nikhil Devshatwar 2016-11-18 21:20:36 -02:00 • committed by Mauro Carvalho Chehab

parent c786595beb

commit 07e72eb072

1 changed files with 3 additions and 2 deletions

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drivers/media/platform/ti-vpe/vpdma.c

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