[PATCH v2 2/2] media: vsp1: Document max_width restriction on UDS

[Kieran Bingham]

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@xxxxxxxxxxxxxxxx>
---
 drivers/media/platform/vsp1/vsp1_uds.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/media/platform/vsp1/vsp1_uds.c b/drivers/media/platform/vsp1/vsp1_uds.c
index 75c613050151..e8340de85813 100644
--- a/drivers/media/platform/vsp1/vsp1_uds.c
+++ b/drivers/media/platform/vsp1/vsp1_uds.c
@@ -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 parition windows we clamp at units of 256 and
+	 * the remaining pixels are reserved.
+	 */
 	if (hscale <= 2)
 		return 256;
 	else if (hscale <= 4)
-- 
2.17.1