media: renesas: vsp1: Compute partitions for DRM pipelines

The DRM pipelines don't partition frames, as the hardware operates
synchronously with the display. The entity operations access
configuration data from the entity state in that case, instead of
accessing the partition structure. This requires special cases in
entity-specific code, increasing the driver complexity.

To prepare for simplifying the code, initialize a single partition for
the DRM pipelines, similarly to how video pipelines create one partition
spanning the full image when partitioning isn't needed. The partition is
allocated statically in the vsp1_drm_pipeline structure instead of
dynamically as for video pipelines, as DRM pipelines are guaranteed to
operate on a single partition.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

drivers/media/platform/renesas/vsp1/vsp1_drm.c

@@ -550,6 +550,9 @@ static void vsp1_du_pipeline_configure(struct vsp1_pipeline *pipe)
 	struct vsp1_dl_body *dlb;
 	unsigned int dl_flags = 0;
 
+	vsp1_pipeline_calculate_partition(pipe, &pipe->part_table[0],
+					  drm_pipe->width, 0);
+
 	if (drm_pipe->force_brx_release)
 		dl_flags |= VSP1_DL_FRAME_END_INTERNAL;
 	if (pipe->output->writeback)
@@ -573,7 +576,8 @@ static void vsp1_du_pipeline_configure(struct vsp1_pipeline *pipe)
 		vsp1_entity_route_setup(entity, pipe, dlb);
 		vsp1_entity_configure_stream(entity, pipe, dl, dlb);
 		vsp1_entity_configure_frame(entity, pipe, dl, dlb);
-		vsp1_entity_configure_partition(entity, pipe, NULL, dl, dlb);
+		vsp1_entity_configure_partition(entity, pipe,
+						&pipe->part_table[0], dl, dlb);
 	}
 
 	vsp1_dl_list_commit(dl, dl_flags);
@@ -968,6 +972,9 @@ int vsp1_drm_init(struct vsp1_device *vsp1)
 
 		vsp1_pipeline_init(pipe);
 
+		pipe->partitions = 1;
+		pipe->part_table = &drm_pipe->partition;
+
 		pipe->frame_end = vsp1_du_pipeline_frame_end;
 
 		/*

drivers/media/platform/renesas/vsp1/vsp1_drm.h

@@ -20,6 +20,7 @@
 /**
  * struct vsp1_drm_pipeline - State for the API exposed to the DRM driver
  * @pipe: the VSP1 pipeline used for display
+ * @partition: the pre-calculated partition used by the pipeline
  * @width: output display width
  * @height: output display height
  * @force_brx_release: when set, release the BRx during the next reconfiguration
@@ -31,6 +32,7 @@
  */
 struct vsp1_drm_pipeline {
 	struct vsp1_pipeline pipe;
+	struct vsp1_partition partition;
 
 	unsigned int width;
 	unsigned int height;