libcamera: ipu3: Merge IPA metadata controls

When a Request is completed upon receiving the IPA produced metadata,
they should be merged with the metadata set by the pipeline handler
before reporting them to applications.

Use ControlList::merge() to collect the IPA produced controls to the
request's metadata.

Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/pipeline/ipu3/ipu3.cpp

@@ -1190,11 +1190,8 @@ void IPU3CameraData::queueFrameAction(unsigned int id,
 		if (!info)
 			break;
 
-		/*
-		 * \todo Parse the value of the controls returned by the IPA
-		 * in action.controls to register additional metadata.
-		 */
 		Request *request = info->request;
+		request->metadata().merge(action.controls);
 
 		info->metadataProcessed = true;
 		if (frameInfos_.tryComplete(info))