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>

diff --git a/drivers/media/platform/vsp1/vsp1_sru.c b/drivers/media/platform/vsp1/vsp1_sru.c
index 9919bebf4c549e36411293fdb5d3f96cc8df0067..b1617cb1f2b9d9923538ae505cdae563aa32e3f4 100644 (file)
--- a/drivers/media/platform/vsp1/vsp1_sru.c
+++ b/drivers/media/platform/vsp1/vsp1_sru.c
@@ -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