[libcamera-devel] [PATCH v1 2/9] ipa: raspberrypi: Add minimum and maximum line length fields to CameraMode

[Naushir Patuck]

Add fields for minimum and maximum line length (in units of pixels) to the
CameraMode structure. This replaces the existing lineLength field.

Any use of the existing lineLength field is replaced by the new minLineLength
field, as logically we always want to use the fastest sensor readout by default.

Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
---
 src/ipa/raspberrypi/cam_helper.cpp           |  8 ++++----
 src/ipa/raspberrypi/controller/camera_mode.h |  2 +-
 src/ipa/raspberrypi/raspberrypi.cpp          | 13 +++++++------
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/ipa/raspberrypi/cam_helper.cpp b/src/ipa/raspberrypi/cam_helper.cpp
index cac8f39ee763..42251ba29682 100644
--- a/src/ipa/raspberrypi/cam_helper.cpp
+++ b/src/ipa/raspberrypi/cam_helper.cpp
@@ -64,13 +64,13 @@ void CamHelper::process([[maybe_unused]] StatisticsPtr &stats,
 uint32_t CamHelper::exposureLines(const Duration exposure) const
 {
 	assert(initialized_);
-	return exposure / mode_.lineLength;
+	return exposure / mode_.minLineLength;
 }
 
 Duration CamHelper::exposure(uint32_t exposureLines) const
 {
 	assert(initialized_);
-	return exposureLines * mode_.lineLength;
+	return exposureLines * mode_.minLineLength;
 }
 
 uint32_t CamHelper::getVBlanking(Duration &exposure,
@@ -86,8 +86,8 @@ uint32_t CamHelper::getVBlanking(Duration &exposure,
 	 * minFrameDuration and maxFrameDuration are clamped by the caller
 	 * based on the limits for the active sensor mode.
 	 */
-	frameLengthMin = minFrameDuration / mode_.lineLength;
-	frameLengthMax = maxFrameDuration / mode_.lineLength;
+	frameLengthMin = minFrameDuration / mode_.minLineLength;
+	frameLengthMax = maxFrameDuration / mode_.minLineLength;
 
 	/*
 	 * Limit the exposure to the maximum frame duration requested, and
diff --git a/src/ipa/raspberrypi/controller/camera_mode.h b/src/ipa/raspberrypi/controller/camera_mode.h
index a6ccf8c1c600..b7e73aae4698 100644
--- a/src/ipa/raspberrypi/controller/camera_mode.h
+++ b/src/ipa/raspberrypi/controller/camera_mode.h
@@ -32,7 +32,7 @@ struct CameraMode {
 	/* scaling of the noise compared to the native sensor mode */
 	double noiseFactor;
 	/* line time */
-	libcamera::utils::Duration lineLength;
+	libcamera::utils::Duration minLineLength, maxLineLength;
 	/* any camera transform *not* reflected already in the camera tuning */
 	libcamera::Transform transform;
 	/* minimum and maximum fame lengths in units of lines */
diff --git a/src/ipa/raspberrypi/raspberrypi.cpp b/src/ipa/raspberrypi/raspberrypi.cpp
index 358a119da222..67326bcf4a14 100644
--- a/src/ipa/raspberrypi/raspberrypi.cpp
+++ b/src/ipa/raspberrypi/raspberrypi.cpp
@@ -314,7 +314,7 @@ void IPARPi::start(const ControlList &controls, StartConfig *startConfig)
 	}
 
 	startConfig->dropFrameCount = dropFrameCount_;
-	const Duration maxSensorFrameDuration = mode_.maxFrameLength * mode_.lineLength;
+	const Duration maxSensorFrameDuration = mode_.maxFrameLength * mode_.minLineLength;
 	startConfig->maxSensorFrameLengthMs = maxSensorFrameDuration.get<std::milli>();
 
 	firstStart_ = false;
@@ -356,7 +356,8 @@ void IPARPi::setMode(const IPACameraSensorInfo &sensorInfo)
 	 * Calculate the line length as the ratio between the line length in
 	 * pixels and the pixel rate.
 	 */
-	mode_.lineLength = sensorInfo.minLineLength * (1.0s / sensorInfo.pixelRate);
+	mode_.minLineLength = sensorInfo.minLineLength * (1.0s / sensorInfo.pixelRate);
+	mode_.maxLineLength = sensorInfo.maxLineLength * (1.0s / sensorInfo.pixelRate);
 
 	/*
 	 * Set the frame length limits for the mode to ensure exposure and
@@ -458,8 +459,8 @@ int IPARPi::configure(const IPACameraSensorInfo &sensorInfo,
 	 * based on the current sensor mode.
 	 */
 	ControlInfoMap::Map ctrlMap = ipaControls;
-	const Duration minSensorFrameDuration = mode_.minFrameLength * mode_.lineLength;
-	const Duration maxSensorFrameDuration = mode_.maxFrameLength * mode_.lineLength;
+	const Duration minSensorFrameDuration = mode_.minFrameLength * mode_.minLineLength;
+	const Duration maxSensorFrameDuration = mode_.maxFrameLength * mode_.minLineLength;
 	ctrlMap[&controls::FrameDurationLimits] =
 		ControlInfo(static_cast<int64_t>(minSensorFrameDuration.get<std::micro>()),
 			    static_cast<int64_t>(maxSensorFrameDuration.get<std::micro>()));
@@ -1150,8 +1151,8 @@ void IPARPi::applyAWB(const struct AwbStatus *awbStatus, ControlList &ctrls)
 
 void IPARPi::applyFrameDurations(Duration minFrameDuration, Duration maxFrameDuration)
 {
-	const Duration minSensorFrameDuration = mode_.minFrameLength * mode_.lineLength;
-	const Duration maxSensorFrameDuration = mode_.maxFrameLength * mode_.lineLength;
+	const Duration minSensorFrameDuration = mode_.minFrameLength * mode_.minLineLength;
+	const Duration maxSensorFrameDuration = mode_.maxFrameLength * mode_.minLineLength;
 
 	/*
 	 * This will only be applied once AGC recalculations occur.
-- 
2.25.1