[media] v4l: vsp1: Determine partition requirements for scaled images

The partition algorithm needs to determine the capabilities of each
entity in the pipeline to identify the correct maximum partition width.

Extend the vsp1 entity operations to provide a max_width operation and
use this call to calculate the number of partitions that will be
processed by the algorithm.

Gen 2 hardware does not require multiple partitioning, and as such
will always return a single partition.

Signed-off-by: Kieran Bingham <kieran+renesas@bingham.xyz>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
index b8339d874df4..b903cc5471e0 100644
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -169,6 +169,43 @@ static int __vsp1_video_try_format(struct vsp1_video *video,
 }
 
 /* -----------------------------------------------------------------------------
+ * VSP1 Partition Algorithm support
+ */
+
+static void vsp1_video_pipeline_setup_partitions(struct vsp1_pipeline *pipe)
+{
+	struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
+	const struct v4l2_mbus_framefmt *format;
+	struct vsp1_entity *entity;
+	unsigned int div_size;
+
+	format = vsp1_entity_get_pad_format(&pipe->output->entity,
+					    pipe->output->entity.config,
+					    RWPF_PAD_SOURCE);
+	div_size = format->width;
+
+	/* Gen2 hardware doesn't require image partitioning. */
+	if (vsp1->info->gen == 2) {
+		pipe->div_size = div_size;
+		pipe->partitions = 1;
+		return;
+	}
+
+	list_for_each_entry(entity, &pipe->entities, list_pipe) {
+		unsigned int entity_max = VSP1_VIDEO_MAX_WIDTH;
+
+		if (entity->ops->max_width) {
+			entity_max = entity->ops->max_width(entity, pipe);
+			if (entity_max)
+				div_size = min(div_size, entity_max);
+		}
+	}
+
+	pipe->div_size = div_size;
+	pipe->partitions = DIV_ROUND_UP(format->width, div_size);
+}
+
+/* -----------------------------------------------------------------------------
  * Pipeline Management
  */
 
@@ -594,6 +631,9 @@ static int vsp1_video_setup_pipeline(struct vsp1_pipeline *pipe)
 {
 	struct vsp1_entity *entity;
 
+	/* Determine this pipelines sizes for image partitioning support. */
+	vsp1_video_pipeline_setup_partitions(pipe);
+
 	/* Prepare the display list. */
 	pipe->dl = vsp1_dl_list_get(pipe->output->dlm);
 	if (!pipe->dl)