ipa: ipu3: Support return values from configure()

The IPU3 IPA interface does not define a return value from configure().
This prevents errors from being reported back to the pipeline handler
when they occur in the IPA.

Update the IPU3 IPA interface and add return values to the checks in
IPAIPU3::configure() accordingly

Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/ipu3/ipu3.cpp

@@ -43,7 +43,7 @@ public:
 	int start() override;
 	void stop() override {}
 
-	void configure(const IPAConfigInfo &configInfo) override;
+	int configure(const IPAConfigInfo &configInfo) override;
 
 	void mapBuffers(const std::vector<IPABuffer> &buffers) override;
 	void unmapBuffers(const std::vector<unsigned int> &ids) override;
@@ -142,10 +142,12 @@ void IPAIPU3::calculateBdsGrid(const Size &bdsOutputSize)
 			    << (int)bdsGrid_.height << " << " << (int)bdsGrid_.block_height_log2 << ")";
 }
 
-void IPAIPU3::configure(const IPAConfigInfo &configInfo)
+int IPAIPU3::configure(const IPAConfigInfo &configInfo)
 {
-	if (configInfo.entityControls.empty())
-		return;
+	if (configInfo.entityControls.empty()) {
+		LOG(IPAIPU3, Error) << "No controls provided";
+		return -ENODATA;
+	}
 
 	sensorInfo_ = configInfo.sensorInfo;
 
@@ -154,19 +156,19 @@ void IPAIPU3::configure(const IPAConfigInfo &configInfo)
 	const auto itExp = ctrls_.find(V4L2_CID_EXPOSURE);
 	if (itExp == ctrls_.end()) {
 		LOG(IPAIPU3, Error) << "Can't find exposure control";
-		return;
+		return -EINVAL;
 	}
 
 	const auto itGain = ctrls_.find(V4L2_CID_ANALOGUE_GAIN);
 	if (itGain == ctrls_.end()) {
 		LOG(IPAIPU3, Error) << "Can't find gain control";
-		return;
+		return -EINVAL;
 	}
 
 	const auto itVBlank = ctrls_.find(V4L2_CID_VBLANK);
 	if (itVBlank == ctrls_.end()) {
 		LOG(IPAIPU3, Error) << "Can't find VBLANK control";
-		return;
+		return -EINVAL;
 	}
 
 	minExposure_ = std::max(itExp->second.min().get<int32_t>(), 1);
@@ -188,6 +190,8 @@ void IPAIPU3::configure(const IPAConfigInfo &configInfo)
 
 	agcAlgo_ = std::make_unique<IPU3Agc>();
 	agcAlgo_->initialise(bdsGrid_, sensorInfo_);
+
+	return 0;
 }
 
 void IPAIPU3::mapBuffers(const std::vector<IPABuffer> &buffers)

src/libcamera/pipeline/ipu3/ipu3.cpp

@@ -642,7 +642,11 @@ int PipelineHandlerIPU3::configure(Camera *camera, CameraConfiguration *c)
 	configInfo.bdsOutputSize = config->imguConfig().bds;
 	configInfo.iif = config->imguConfig().iif;
 
-	data->ipa_->configure(configInfo);
+	ret = data->ipa_->configure(configInfo);
+	if (ret) {
+		LOG(IPU3, Error) << "Failed to configure IPA";
+		return ret;
+	}
 
 	return 0;
 }