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media: vsp1: Document max_width restriction on UDS

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The UDS is currently restricted based on a partition size of 256 pixels.
Document the actual restrictions, but don't increase the implementation.

The extended partition algorithm may later choose to utilise a larger
partition size 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 10:26:52 -04:00 committed by Mauro Carvalho Chehab
parent ce51fd3b4a
commit 03939db7cb
1 changed files with 8 additions and 0 deletions
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8
drivers/media/platform/vsp1/vsp1_uds.c
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@ -342,6 +342,14 @@ static unsigned int uds_max_width(struct vsp1_entity *entity,
UDS_PAD_SOURCE);
hscale = output->width / input->width;
/*
* The maximum width of the UDS is 304 pixels. These are input pixels
* in the event of up-scaling, and output pixels in the event of
* downscaling.
*
* To support overlapping partition windows we clamp at units of 256 and
* the remaining pixels are reserved.
*/
if (hscale <= 2)
return 256;
else if (hscale <= 4)