media: rcar-vin: allocate a scratch buffer at stream start

Browse source

Before starting a capture, allocate a scratch buffer which can be used
by the driver to give to the hardware if no buffers are available from
userspace. The buffer is not used in this patch but prepares for future
refactoring where the scratch buffer can be used to avoid the need to
fallback on single capture mode if userspace can't queue buffers as fast
as the VIN driver consumes them.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

...

This commit is contained in:

Niklas Söderlund 2018-03-13 22:49:09 -04:00 • committed by Mauro Carvalho Chehab

parent 579260a5ef

commit 6a8ffa8b4c

2 changed files with 23 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

19

drivers/media/platform/rcar-vin/rcar-dma.c

View file

4

drivers/media/platform/rcar-vin/rcar-vin.h

View file