pipeline: raspberrypi: Add a parameter to disable startup drop frames

Add a new pipeline config parameter "disable_startup_frame_drops" to
disable any startup drop frames, overriding the IPA request.

When this parameter is set, it allows the pipeline handler to run with
no internally allocated Unicam buffers ("min_unicam_buffers").

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/libcamera/pipeline/raspberrypi/data/example.yaml b/src/libcamera/pipeline/raspberrypi/data/example.yaml
index 4662136e..ad5f2344 100644
--- a/src/libcamera/pipeline/raspberrypi/data/example.yaml
+++ b/src/libcamera/pipeline/raspberrypi/data/example.yaml
@@ -27,6 +27,11 @@
                 # internal buffer count = max(min_unicam_buffers,
                 #         min_total_unicam_buffers - external buffer count)
                 #
-                # "min_total_unicam_buffers": 4
+                # "min_total_unicam_buffers": 4,
+
+                # Override any request from the IPA to drop a number of startup
+                # frames.
+                #
+                # "disable_startup_frame_drops": false
         }
 }