rkisp1: agc: Agc add yTarget to frame context

The upcoming WDR algorithm needs access to the effective yTarget value
for its calculations. Add it to the frame context.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/rkisp1/algorithms/agc.cpp

@@ -208,6 +208,8 @@ int Agc::configure(IPAContext &context, const IPACameraSensorInfo &configInfo)
 		  context.configuration.sensor.minAnalogueGain,
 		  context.configuration.sensor.maxAnalogueGain, {});
 
+	context.activeState.agc.automatic.yTarget = effectiveYTarget();
+
 	resetFrameCount();
 
 	return 0;
@@ -375,6 +377,8 @@ void Agc::prepare(IPAContext &context, const uint32_t frame,
 		frameContext.compress.gain = frameContext.agc.quantizationGain;
 	}
 
+	frameContext.agc.yTarget = context.activeState.agc.automatic.yTarget;
+
 	if (frame > 0 && !frameContext.agc.updateMetering)
 		return;
 
@@ -627,6 +631,7 @@ void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 	activeState.agc.automatic.exposure = newExposureTime / lineDuration;
 	activeState.agc.automatic.gain = aGain;
 	activeState.agc.automatic.quantizationGain = qGain;
+	activeState.agc.automatic.yTarget = effectiveYTarget();
 	/*
 	 * Expand the target frame duration so that we do not run faster than
 	 * the minimum frame duration when we have short exposures.

src/ipa/rkisp1/ipa_context.h

@@ -83,6 +83,7 @@ struct IPAActiveState {
 			uint32_t exposure;
 			double gain;
 			double quantizationGain;
+			double yTarget;
 		} automatic;
 
 		bool autoExposureEnabled;
@@ -139,6 +140,7 @@ struct IPAFrameContext : public FrameContext {
 		double exposureValue;
 		double quantizationGain;
 		uint32_t vblank;
+		double yTarget;
 		bool autoExposureEnabled;
 		bool autoGainEnabled;
 		controls::AeConstraintModeEnum constraintMode;