ipa: raspberrypi: Rationalise parameters to ipa::start()

Separate out the in and out parameters in ipa::start() as they are not
the same. This function now takes in a ControlList and returns out a
struct StartConfig which holds a ControlList and drop frame count for
the pipeline handler to action.

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

3 files changed, 14 insertions, 21 deletions

diff --git a/include/libcamera/ipa/raspberrypi.mojom b/include/libcamera/ipa/raspberrypi.mojom
index fafbd6c0..55824eeb 100644
--- a/include/libcamera/ipa/raspberrypi.mojom
+++ b/include/libcamera/ipa/raspberrypi.mojom
@@ -39,14 +39,14 @@ struct ConfigOutput {
 	ControlList controls;
 };
 
-struct StartControls {
+struct StartConfig {
 	ControlList controls;
 	int32 dropFrameCount;
 };
 
 interface IPARPiInterface {
 	init(IPASettings settings) => (int32 ret, SensorConfig sensorConfig);
-	start(StartControls controls) => (StartControls result);
+	start(ControlList controls) => (StartConfig startConfig);
 	stop();
 
 	/**
diff --git a/src/ipa/raspberrypi/raspberrypi.cpp b/src/ipa/raspberrypi/raspberrypi.cpp
index 93e43f06..b717a83e 100644
--- a/src/ipa/raspberrypi/raspberrypi.cpp
+++ b/src/ipa/raspberrypi/raspberrypi.cpp
@@ -79,8 +79,7 @@ public:
 	}
 
 	int init(const IPASettings &settings, ipa::RPi::SensorConfig *sensorConfig) override;
-	void start(const ipa::RPi::StartControls &data,
-		   ipa::RPi::StartControls *result) override;
+	void start(const ControlList &controls, ipa::RPi::StartConfig *startConfig) override;
 	void stop() override {}
 
 	int configure(const CameraSensorInfo &sensorInfo,
@@ -192,15 +191,14 @@ int IPARPi::init(const IPASettings &settings, ipa::RPi::SensorConfig *sensorConf
 	return 0;
 }
 
-void IPARPi::start(const ipa::RPi::StartControls &data,
-		   ipa::RPi::StartControls *result)
+void IPARPi::start(const ControlList &controls, ipa::RPi::StartConfig *startConfig)
 {
 	RPiController::Metadata metadata;
 
-	ASSERT(result);
-	if (!data.controls.empty()) {
+	ASSERT(startConfig);
+	if (!controls.empty()) {
 		/* We have been given some controls to action before start. */
-		queueRequest(data.controls);
+		queueRequest(controls);
 	}
 
 	controller_.SwitchMode(mode_, &metadata);
@@ -215,7 +213,7 @@ void IPARPi::start(const ipa::RPi::StartControls &data,
 	if (agcStatus.shutter_time != 0.0 && agcStatus.analogue_gain != 0.0) {
 		ControlList ctrls(sensorCtrls_);
 		applyAGC(&agcStatus, ctrls);
-		result->controls = std::move(ctrls);
+		startConfig->controls = std::move(ctrls);
 	}
 
 	/*
@@ -262,7 +260,7 @@ void IPARPi::start(const ipa::RPi::StartControls &data,
 		mistrustCount_ = helper_->MistrustFramesModeSwitch();
 	}
 
-	result->dropFrameCount = dropFrame;
+	startConfig->dropFrameCount = dropFrame;
 
 	firstStart_ = false;
 }
diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index ed8cc4ea..a65d5389 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -815,20 +815,15 @@ int PipelineHandlerRPi::start(Camera *camera, const ControlList *controls)
 		data->applyScalerCrop(*controls);
 
 	/* Start the IPA. */
-	ipa::RPi::StartControls ipaData;
-	ipa::RPi::StartControls result;
-	if (controls)
-		ipaData.controls = *controls;
-	data->ipa_->start(ipaData, &result);
+	ipa::RPi::StartConfig startConfig;
+	data->ipa_->start(controls ? *controls : ControlList{}, &startConfig);
 
 	/* Apply any gain/exposure settings that the IPA may have passed back. */
-	if (!result.controls.empty()) {
-		ControlList &ctrls = result.controls;
-		data->unicam_[Unicam::Image].dev()->setControls(&ctrls);
-	}
+	if (!startConfig.controls.empty())
+		data->unicam_[Unicam::Image].dev()->setControls(&startConfig.controls);
 
 	/* Configure the number of dropped frames required on startup. */
-	data->dropFrameCount_ = result.dropFrameCount;
+	data->dropFrameCount_ = startConfig.dropFrameCount;
 
 	/* We need to set the dropFrameCount_ before queueing buffers. */
 	ret = queueAllBuffers(camera);