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[RFC,v2,3/5] media: vsp1: Document partition algorithm in code header

Message ID 20190301170848.6598-4-kieran.bingham@ideasonboard.com (mailing list archive)
State New
Delegated to: Kieran Bingham
Headers show
Series media: vsp1: Partition phased overlap support | expand

Commit Message

Kieran Bingham March 1, 2019, 5:08 p.m. UTC
From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

The image partition algorithm operates on the image dimensions as input
into the WPF entity. Document this in the code block header.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
 drivers/media/platform/vsp1/vsp1_video.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
index 563f9a02c373..d1ecc3d91290 100644
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -173,6 +173,14 @@  static int __vsp1_video_try_format(struct vsp1_video *video,
 /* -----------------------------------------------------------------------------
  * VSP1 Partition Algorithm support
+ *
+ * VSP hardware can have restrictions on image width dependent on the hardware
+ * configuration of the pipeline. Adapting for these restrictions is implemented
+ * via the partition algorithm.
+ *
+ * The partition windows and sizes are based on the output size of the WPF
+ * before rotation, which is represented by the input parameters to the WPF
+ * entity in our pipeline.