[PATCH 3/4] v4l: vsp1: Calculate partition sizes at stream start.

[Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>]

Previously the active window and partition sizes for each partition is
calculated for each partition every frame. This data is constant and
only needs to be calculated once at the start of the stream.

Extend the vsp1_pipe object to store the maximum number of partitions
possible and pre-calculate the partition sizes into this table.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
---
 drivers/media/platform/vsp1/vsp1_pipe.h  | 6 ++++++
 drivers/media/platform/vsp1/vsp1_video.c | 8 ++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/vsp1/vsp1_pipe.h b/drivers/media/platform/vsp1/vsp1_pipe.h
index f181949824c9..3af96c4ea244 100644
--- a/drivers/media/platform/vsp1/vsp1_pipe.h
+++ b/drivers/media/platform/vsp1/vsp1_pipe.h
@@ -20,6 +20,9 @@
 
 #include <media/media-entity.h>
 
+/* Max Video Width / Min Partition Size = 8190/128 */
+#define VSP1_PIPE_MAX_PARTITIONS 64
+
 struct vsp1_dl_list;
 struct vsp1_rwpf;
 
@@ -81,7 +84,9 @@ enum vsp1_pipeline_state {
  * @dl: display list associated with the pipeline
  * @div_size: The maximum allowed partition size for the pipeline
  * @partitions: The number of partitions used to process one frame
+ * @partition: The current partition for configuration to process
  * @current_partition: The partition number currently being configured
+ * @part_table: The pre-calculated partitions used by the pipeline
  */
 struct vsp1_pipeline {
 	struct media_pipeline pipe;
@@ -116,6 +121,7 @@ struct vsp1_pipeline {
 	unsigned int partitions;
 	struct v4l2_rect partition;
 	unsigned int current_partition;
+	struct v4l2_rect part_table[VSP1_PIPE_MAX_PARTITIONS];
 };
 
 void vsp1_pipeline_reset(struct vsp1_pipeline *pipe);
diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
index 6d43c02bbc56..c4a8c30df108 100644
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -255,6 +255,7 @@ static void vsp1_video_pipeline_setup_partitions(struct vsp1_pipeline *pipe)
 	const struct v4l2_mbus_framefmt *format;
 	struct vsp1_entity *entity;
 	unsigned int div_size;
+	int i;
 
 	/*
 	 * Partitions are computed on the size before rotation, use the format
@@ -269,6 +270,7 @@ static void vsp1_video_pipeline_setup_partitions(struct vsp1_pipeline *pipe)
 	if (vsp1->info->gen == 2) {
 		pipe->div_size = div_size;
 		pipe->partitions = 1;
+		pipe->part_table[0] = vsp1_video_partition(pipe, div_size, 0);
 		return;
 	}
 
@@ -284,6 +286,9 @@ static void vsp1_video_pipeline_setup_partitions(struct vsp1_pipeline *pipe)
 
 	pipe->div_size = div_size;
 	pipe->partitions = DIV_ROUND_UP(format->width, div_size);
+
+	for (i = 0; i < pipe->partitions; i++)
+		pipe->part_table[i] = vsp1_video_partition(pipe, div_size, i);
 }
 
 /* -----------------------------------------------------------------------------
@@ -355,8 +360,7 @@ static void vsp1_video_pipeline_run_partition(struct vsp1_pipeline *pipe,
 {
 	struct vsp1_entity *entity;
 
-	pipe->partition = vsp1_video_partition(pipe, pipe->div_size,
-					       pipe->current_partition);
+	pipe->partition = pipe->part_table[pipe->current_partition];
 
 	list_for_each_entry(entity, &pipe->entities, list_pipe) {
 		if (entity->ops->configure)
-- 
2.7.4