libcamera: raspberrypi: Fetch correct value for SensorSensitivity

These changes retrieve the correct value for sensitivity of the mode
selected for the sensor. This value is known to the CamHelper which
passes it across to the pipeline handler so that it can be set
correctly in the camera properties.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/ipa/raspberrypi.mojom

@@ -38,6 +38,10 @@ struct IPAConfig {
 	libcamera.SharedFD lsTableHandle;
 };
 
+struct IPAConfigResult {
+       float modeSensitivity;
+};
+
 struct StartConfig {
 	libcamera.ControlList controls;
 	int32 dropFrameCount;
@@ -58,6 +62,7 @@ interface IPARPiInterface {
 	 * \param[in] entityControls Controls provided by the pipeline entities
 	 * \param[in] ipaConfig Pipeline-handler-specific configuration data
 	 * \param[out] controls Controls to apply by the pipeline entity
+	 * \param[out] result Other results that the pipeline handler may require
 	 *
 	 * This function shall be called when the camera is configured to inform
 	 * the IPA of the camera's streams and the sensor settings.
@@ -72,7 +77,7 @@ interface IPARPiInterface {
 		  map<uint32, libcamera.IPAStream> streamConfig,
 		  map<uint32, libcamera.ControlInfoMap> entityControls,
 		  IPAConfig ipaConfig)
-		=> (int32 ret, libcamera.ControlList controls);
+		=> (int32 ret, libcamera.ControlList controls, IPAConfigResult result);
 
 	/**
 	 * \fn mapBuffers()

src/ipa/raspberrypi/raspberrypi.cpp

@@ -99,7 +99,7 @@ public:
 		      const std::map<unsigned int, IPAStream> &streamConfig,
 		      const std::map<unsigned int, ControlInfoMap> &entityControls,
 		      const IPAConfig &data,
-		      ControlList *controls) override;
+		      ControlList *controls, IPAConfigResult *result) override;
 	void mapBuffers(const std::vector<IPABuffer> &buffers) override;
 	void unmapBuffers(const std::vector<unsigned int> &ids) override;
 	void signalStatReady(const uint32_t bufferId) override;
@@ -344,7 +344,7 @@ int IPARPi::configure(const IPACameraSensorInfo &sensorInfo,
 		      [[maybe_unused]] const std::map<unsigned int, IPAStream> &streamConfig,
 		      const std::map<unsigned int, ControlInfoMap> &entityControls,
 		      const IPAConfig &ipaConfig,
-		      ControlList *controls)
+		      ControlList *controls, IPAConfigResult *result)
 {
 	if (entityControls.size() != 2) {
 		LOG(IPARPI, Error) << "No ISP or sensor controls found.";
@@ -404,6 +404,9 @@ int IPARPi::configure(const IPACameraSensorInfo &sensorInfo,
 	 */
 	ControlList ctrls(sensorCtrls_);
 
+	/* The pipeline handler passes out the mode's sensitivity. */
+	result->modeSensitivity = mode_.sensitivity;
+
 	if (firstStart_) {
 		/* Supply initial values for frame durations. */
 		applyFrameDurations(defaultMinFrameDuration, defaultMaxFrameDuration);

src/libcamera/pipeline/raspberrypi/raspberrypi.cpp

@@ -200,7 +200,7 @@ public:
 	void frameStarted(uint32_t sequence);
 
 	int loadIPA(ipa::RPi::SensorConfig *sensorConfig);
-	int configureIPA(const CameraConfiguration *config);
+	int configureIPA(const CameraConfiguration *config, ipa::RPi::IPAConfigResult *result);
 
 	void enumerateVideoDevices(MediaLink *link);
 
@@ -898,7 +898,8 @@ int PipelineHandlerRPi::configure(Camera *camera, CameraConfiguration *config)
 
 	data->isp_[Isp::Input].dev()->setSelection(V4L2_SEL_TGT_CROP, &crop);
 
-	ret = data->configureIPA(config);
+	ipa::RPi::IPAConfigResult result;
+	ret = data->configureIPA(config, &result);
 	if (ret)
 		LOG(RPI, Error) << "Failed to configure the IPA: " << ret;
 
@@ -937,6 +938,9 @@ int PipelineHandlerRPi::configure(Camera *camera, CameraConfiguration *config)
 	 */
 	data->properties_.set(properties::ScalerCropMaximum, data->sensorInfo_.analogCrop);
 
+	/* Store the mode sensitivity for the application. */
+	data->properties_.set(properties::SensorSensitivity, result.modeSensitivity);
+
 	/* Setup the Video Mux/Bridge entities. */
 	for (auto &[device, link] : data->bridgeDevices_) {
 		/*
@@ -1528,7 +1532,7 @@ int RPiCameraData::loadIPA(ipa::RPi::SensorConfig *sensorConfig)
 	return ipa_->init(settings, sensorConfig);
 }
 
-int RPiCameraData::configureIPA(const CameraConfiguration *config)
+int RPiCameraData::configureIPA(const CameraConfiguration *config, ipa::RPi::IPAConfigResult *result)
 {
 	std::map<unsigned int, IPAStream> streamConfig;
 	std::map<unsigned int, ControlInfoMap> entityControls;
@@ -1574,7 +1578,7 @@ int RPiCameraData::configureIPA(const CameraConfiguration *config)
 	/* Ready the IPA - it must know about the sensor resolution. */
 	ControlList controls;
 	ret = ipa_->configure(sensorInfo_, streamConfig, entityControls, ipaConfig,
-			      &controls);
+			      &controls, result);
 	if (ret < 0) {
 		LOG(RPI, Error) << "IPA configuration failed!";
 		return -EPIPE;