ipa: rkisp1: Move shutter speed and analogue gain limits from agc to sensor

The limits for the shutter speed and analogue gain are stored in
IPASessionConfiguration::agc. While they're related to the AGC, they are
properties of the sensor, and are stored in the session configuration by
the IPA module, not the AGC algorithm. Move them to the
IPASessionConfiguration::sensor structure where they belong.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/ipa/rkisp1/algorithms/agc.cpp

@@ -74,7 +74,8 @@ Agc::Agc()
 int Agc::configure(IPAContext &context, const IPACameraSensorInfo &configInfo)
 {
 	/* Configure the default exposure and gain. */
-	context.activeState.agc.gain = std::max(context.configuration.agc.minAnalogueGain, kMinAnalogueGain);
+	context.activeState.agc.gain = std::max(context.configuration.sensor.minAnalogueGain,
+						kMinAnalogueGain);
 	context.activeState.agc.exposure = 10ms / context.configuration.sensor.lineDuration;
 
 	/*
@@ -202,13 +203,13 @@ void Agc::computeExposure(IPAContext &context, IPAFrameContext &frameContext,
 	/* Use the highest of the two gain estimates. */
 	double evGain = std::max(yGain, iqMeanGain);
 
-	utils::Duration minShutterSpeed = configuration.agc.minShutterSpeed;
+	utils::Duration minShutterSpeed = configuration.sensor.minShutterSpeed;
-	utils::Duration maxShutterSpeed = std::min(configuration.agc.maxShutterSpeed,
+	utils::Duration maxShutterSpeed = std::min(configuration.sensor.maxShutterSpeed,
 						   kMaxShutterSpeed);
 
-	double minAnalogueGain = std::max(configuration.agc.minAnalogueGain,
+	double minAnalogueGain = std::max(configuration.sensor.minAnalogueGain,
 					  kMinAnalogueGain);
-	double maxAnalogueGain = std::min(configuration.agc.maxAnalogueGain,
+	double maxAnalogueGain = std::min(configuration.sensor.maxAnalogueGain,
 					  kMaxAnalogueGain);
 
 	/* Consider within 1% of the target as correctly exposed. */

src/ipa/rkisp1/ipa_context.cpp

@@ -28,21 +28,11 @@ namespace libcamera::ipa::rkisp1 {
  * \var IPASessionConfiguration::agc
  * \brief AGC parameters configuration of the IPA
  *
- * \var IPASessionConfiguration::agc.minShutterSpeed
- * \brief Minimum shutter speed supported with the configured sensor
- *
- * \var IPASessionConfiguration::agc.maxShutterSpeed
- * \brief Maximum shutter speed supported with the configured sensor
- *
- * \var IPASessionConfiguration::agc.minAnalogueGain
- * \brief Minimum analogue gain supported with the configured sensor
- *
- * \var IPASessionConfiguration::agc.maxAnalogueGain
- * \brief Maximum analogue gain supported with the configured sensor
- *
  * \var IPASessionConfiguration::agc.measureWindow
  * \brief AGC measure window
- *
+ */
+
+/**
  * \var IPASessionConfiguration::hw
  * \brief RkISP1-specific hardware information
  *
@@ -77,6 +67,18 @@ namespace libcamera::ipa::rkisp1 {
  * \var IPASessionConfiguration::sensor
  * \brief Sensor-specific configuration of the IPA
  *
+ * \var IPASessionConfiguration::sensor.minShutterSpeed
+ * \brief Minimum shutter speed supported with the sensor
+ *
+ * \var IPASessionConfiguration::sensor.maxShutterSpeed
+ * \brief Maximum shutter speed supported with the sensor
+ *
+ * \var IPASessionConfiguration::sensor.minAnalogueGain
+ * \brief Minimum analogue gain supported with the sensor
+ *
+ * \var IPASessionConfiguration::sensor.maxAnalogueGain
+ * \brief Maximum analogue gain supported with the sensor
+ *
  * \var IPASessionConfiguration::sensor.defVBlank
  * \brief The default vblank value of the sensor
  *

src/ipa/rkisp1/ipa_context.h

@@ -22,10 +22,6 @@ namespace ipa::rkisp1 {
 
 struct IPASessionConfiguration {
 	struct {
-		utils::Duration minShutterSpeed;
-		utils::Duration maxShutterSpeed;
-		double minAnalogueGain;
-		double maxAnalogueGain;
 		struct rkisp1_cif_isp_window measureWindow;
 	} agc;
 
@@ -39,6 +35,11 @@ struct IPASessionConfiguration {
 	} lsc;
 
 	struct {
+		utils::Duration minShutterSpeed;
+		utils::Duration maxShutterSpeed;
+		double minAnalogueGain;
+		double maxAnalogueGain;
+
 		int32_t defVBlank;
 		utils::Duration lineDuration;
 		Size size;

src/ipa/rkisp1/rkisp1.cpp

@@ -256,10 +256,12 @@ int IPARkISP1::configure([[maybe_unused]] const IPACameraSensorInfo &info,
 	 *
 	 * \todo take VBLANK into account for maximum shutter speed
 	 */
-	context_.configuration.agc.minShutterSpeed = minExposure * context_.configuration.sensor.lineDuration;
+	context_.configuration.sensor.minShutterSpeed =
-	context_.configuration.agc.maxShutterSpeed = maxExposure * context_.configuration.sensor.lineDuration;
+		minExposure * context_.configuration.sensor.lineDuration;
-	context_.configuration.agc.minAnalogueGain = camHelper_->gain(minGain);
+	context_.configuration.sensor.maxShutterSpeed =
-	context_.configuration.agc.maxAnalogueGain = camHelper_->gain(maxGain);
+		maxExposure * context_.configuration.sensor.lineDuration;
+	context_.configuration.sensor.minAnalogueGain = camHelper_->gain(minGain);
+	context_.configuration.sensor.maxAnalogueGain = camHelper_->gain(maxGain);
 
 	for (auto const &algo : algorithms()) {
 		int ret = algo->configure(context_, info);