ipu3: ipa: Report effective sensor controls with statistics to IPA

The Intel close sourced IPA requires the effective controls applied to
the sensor when the statistics are generated. Report effective sensor controls
with the statistics to IPA.

Signed-off-by: Han-Lin Chen <hanlinchen@chromium.org>
[Jean-Michel: Reword s/stastistics/statistics and move reset after IPA
start]
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/libcamera/pipeline/ipu3/frames.h

@@ -14,6 +14,8 @@
 
 #include <libcamera/base/signal.h>
 
+#include <libcamera/controls.h>
+
 namespace libcamera {
 
 class FrameBuffer;
@@ -34,6 +36,8 @@ public:
 		FrameBuffer *paramBuffer;
 		FrameBuffer *statBuffer;
 
+		ControlList effectiveSensorControls;
+
 		bool paramDequeued;
 		bool metadataProcessed;
 	};

src/libcamera/pipeline/ipu3/ipu3.cpp

@@ -767,6 +767,8 @@ int PipelineHandlerIPU3::start(Camera *camera, [[maybe_unused]] const ControlLis
 	if (ret)
 		goto error;
 
+	data->delayedCtrls_->reset();
+
 	/*
 	 * Start the ImgU video devices, buffers will be queued to the
 	 * ImgU output and viewfinder when requests will be queued.
@@ -1363,6 +1365,8 @@ void IPU3CameraData::cio2BufferReady(FrameBuffer *buffer)
 	request->metadata().set(controls::SensorTimestamp,
 				buffer->metadata().timestamp);
 
+	info->effectiveSensorControls = delayedCtrls_->get(buffer->metadata().sequence);
+
 	if (request->findBuffer(&rawStream_))
 		pipe()->completeBuffer(request, buffer);
 
@@ -1419,6 +1423,7 @@ void IPU3CameraData::statBufferReady(FrameBuffer *buffer)
 	ev.frame = info->id;
 	ev.bufferId = info->statBuffer->cookie();
 	ev.frameTimestamp = request->metadata().get(controls::SensorTimestamp);
+	ev.sensorControls = info->effectiveSensorControls;
 	ipa_->processEvent(ev);
 }