ipa: ipu3: Ensure controls exists in before they are queried

Add a validation check for sensor controls validateSensorControls()
before they are queried in IPAIPU3::updateSessionConfiguration().
Fail the IPAIPU3::configure() if the required sensor controls are
not found.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/ipu3/ipu3.cpp

@@ -155,6 +155,7 @@ private:
 	void parseStatistics(unsigned int frame,
 			     int64_t frameTimestamp,
 			     const ipu3_uapi_stats_3a *stats);
+	bool validateSensorControls();
 
 	void setControls(unsigned int frame);
 	void calculateBdsGrid(const Size &bdsOutputSize);
@@ -268,6 +269,28 @@ void IPAIPU3::updateControls(const IPACameraSensorInfo &sensorInfo,
 	*ipaControls = ControlInfoMap(std::move(controls), controls::controls);
 }
 
+/**
+ * \brief Validate that the sensor controls mandatory for the IPA exists
+ */
+bool IPAIPU3::validateSensorControls()
+{
+	static const uint32_t ctrls[] = {
+		V4L2_CID_ANALOGUE_GAIN,
+		V4L2_CID_EXPOSURE,
+		V4L2_CID_VBLANK,
+	};
+
+	for (auto c : ctrls) {
+		if (sensorCtrls_.find(c) == sensorCtrls_.end()) {
+			LOG(IPAIPU3, Error) << "Unable to find sensor control "
+					    << utils::hex(c);
+			return false;
+		}
+	}
+
+	return true;
+}
+
 /**
  * \brief Initialize the IPA module and its controls
  *
@@ -433,6 +456,11 @@ int IPAIPU3::configure(const IPAConfigInfo &configInfo,
 	/* Clean frameContext at each reconfiguration. */
 	context_.frameContext = {};
 
+	if (!validateSensorControls()) {
+		LOG(IPAIPU3, Error) << "Sensor control validation failed.";
+		return -EINVAL;
+	}
+
 	/* Update the camera controls using the new sensor settings. */
 	updateControls(sensorInfo_, sensorCtrls_, ipaControls);