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media: vsp1: Document max_width restriction on SRU 

The SRU is currently restricted to 256 pixels as part of the current
partition algorithm. Document that the actual capability of this
component is 288 pixels, but don't increase the implementation.

The extended partition algorithm may later choose to utilise a larger
input to support overlapping partitions which will improve the quality
of the output images.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Kieran Bingham 2018-09-14 10:26:51 -04:00 committed by Mauro Carvalho Chehab
parent 23a99e80e3
commit ce51fd3b4a
1 changed files with 5 additions and 0 deletions
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5
drivers/media/platform/vsp1/vsp1_sru.c
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@ -312,6 +312,11 @@ static unsigned int sru_max_width(struct vsp1_entity *entity,
output = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
SRU_PAD_SOURCE);
/*
* The maximum input width of the SRU is 288 input pixels, but 32
* pixels are reserved to support overlapping partition windows when
* scaling.
*/
if (input->width != output->width)
return 512;
else