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| author | Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> | 2018-09-14 17:26:52 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-09-17 21:54:20 +0300 |
| commit | 03939db7cb0e4b430043d2a6ff542909a91e544a (patch) | |
| tree | 1d09a5b5217d0781a6a9d045e8cbc5350020b99c /drivers/media/platform | |
| parent | ce51fd3b4a56bb6c027d9ffa41e2668a70655040 (diff) | |
| download | linux-03939db7cb0e4b430043d2a6ff542909a91e544a.tar.xz | |
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>
Diffstat (limited to 'drivers/media/platform')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_uds.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_uds.c b/drivers/media/platform/vsp1/vsp1_uds.c index 75c613050151..27012af973b2 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 partition windows we clamp at units of 256 and + * the remaining pixels are reserved. + */ if (hscale <= 2) return 256; else if (hscale <= 4) |