Commit 03939db7 authored Sep 14, 2018 by Kieran Bingham Committed by Mauro Carvalho Chehab Sep 17, 2018

media: vsp1: Document max_width restriction on UDS

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>

parent ce51fd3b

drivers/media/platform/vsp1/vsp1_uds.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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)