[libcamera-devel] [RFC PATCH 1/4] pipeline: ipu3: Support IPA tuning file

[Laurent Pinchart]

Pass the path name of the YAML IPA tuning file to the IPA module. The
file name is derived from the sensor name ("${sensor_name}.yaml"), with
a fallback to "uncalibrated.yaml".

The tuning file name can be manually overridden with the
LIBCAMERA_IPU3_TUNING_FILE environment variable.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 src/libcamera/pipeline/ipu3/ipu3.cpp | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index 4fe52f74a68c..5c4a0a567ff2 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -1243,8 +1243,26 @@ int IPU3CameraData::loadIPA()
 	if (ret)
 		return ret;
 
-	ret = ipa_->init(IPASettings{ "", sensor->model() }, sensorInfo,
-			 sensor->controls(), &ipaControls_);
+	/*
+	 * The API tuning file is made from the sensor name unless the
+	 * environment variable overrides it. If
+	 */
+	std::string ipaTuningFile;
+	char const *configFromEnv = utils::secure_getenv("LIBCAMERA_IPU3_TUNING_FILE");
+	if (!configFromEnv || *configFromEnv == '\0') {
+		ipaTuningFile = ipa_->configurationFile(sensor->model() + ".yaml");
+		/*
+		 * If the tuning file isn't found, fall back to the
+		 * 'uncalibrated' configuration file.
+		 */
+		if (ipaTuningFile.empty())
+			ipaTuningFile = ipa_->configurationFile("uncalibrated.yaml");
+	} else {
+		ipaTuningFile = std::string(configFromEnv);
+	}
+
+	ret = ipa_->init(IPASettings{ ipaTuningFile, sensor->model() },
+			 sensorInfo, sensor->controls(), &ipaControls_);
 	if (ret) {
 		LOG(IPU3, Error) << "Failed to initialise the IPU3 IPA";
 		return ret;
-- 
Regards,

Laurent Pinchart