[libcamera-devel] [PATCH v2 4/5] libcamera: raspberrypi: Plumb user transform through to IPA

[David Plowman]

This commit plumbs the user transform from the Raspberry Pi pipeline
handler through to the IPA. Once in the IPA we add it to the
CameraMode description, so that it becomes automatically available to
all the individual control algorithms.

The IPA configure method has to be reordered just a little so as to
fill in the transform in the camera mode before calling SwitchMode.
---
 src/ipa/raspberrypi/controller/camera_mode.h  |  4 ++
 src/ipa/raspberrypi/raspberrypi.cpp           | 48 +++++++++++--------
 .../pipeline/raspberrypi/raspberrypi.cpp      |  5 +-
 3 files changed, 35 insertions(+), 22 deletions(-)

diff --git a/src/ipa/raspberrypi/controller/camera_mode.h b/src/ipa/raspberrypi/controller/camera_mode.h
index 875bab3..920f11b 100644
--- a/src/ipa/raspberrypi/controller/camera_mode.h
+++ b/src/ipa/raspberrypi/controller/camera_mode.h
@@ -6,6 +6,8 @@
  */
 #pragma once
 
+#include <libcamera/transform.h>
+
 // Description of a "camera mode", holding enough information for control
 // algorithms to adapt their behaviour to the different modes of the camera,
 // including binning, scaling, cropping etc.
@@ -33,6 +35,8 @@ struct CameraMode {
 	double noise_factor;
 	// line time in nanoseconds
 	double line_length;
+	// any camera transform *not* reflected already in the camera tuning
+	libcamera::Transform transform;
 };
 
 #ifdef __cplusplus
diff --git a/src/ipa/raspberrypi/raspberrypi.cpp b/src/ipa/raspberrypi/raspberrypi.cpp
index 3747208..0b36d57 100644
--- a/src/ipa/raspberrypi/raspberrypi.cpp
+++ b/src/ipa/raspberrypi/raspberrypi.cpp
@@ -232,6 +232,33 @@ void IPARPi::configure(const CameraSensorInfo &sensorInfo,
 	/* Re-assemble camera mode using the sensor info. */
 	setMode(sensorInfo);
 
+	/*
+	 * The ipaConfig.data always gives us the user transform first. Note that
+	 * this will always make the LS table pointer (if present) element 1.
+	 */
+	mode_.transform = static_cast<libcamera::Transform>(ipaConfig.data[0]);
+
+	/* Store the lens shading table pointer and handle if available. */
+	if (ipaConfig.operation & RPI_IPA_CONFIG_LS_TABLE) {
+		/* Remove any previous table, if there was one. */
+		if (lsTable_) {
+			munmap(lsTable_, MAX_LS_GRID_SIZE);
+			lsTable_ = nullptr;
+		}
+
+		/* Map the LS table buffer into user space (now element 1). */
+		lsTableHandle_ = FileDescriptor(ipaConfig.data[1]);
+		if (lsTableHandle_.isValid()) {
+			lsTable_ = mmap(nullptr, MAX_LS_GRID_SIZE, PROT_READ | PROT_WRITE,
+					MAP_SHARED, lsTableHandle_.fd(), 0);
+
+			if (lsTable_ == MAP_FAILED) {
+				LOG(IPARPI, Error) << "dmaHeap mmap failure for LS table.";
+				lsTable_ = nullptr;
+			}
+		}
+	}
+
 	/* Pass the camera mode to the CamHelper to setup algorithms. */
 	helper_->SetCameraMode(mode_);
 
@@ -280,27 +307,6 @@ void IPARPi::configure(const CameraSensorInfo &sensorInfo,
 	}
 
 	lastMode_ = mode_;
-
-	/* Store the lens shading table pointer and handle if available. */
-	if (ipaConfig.operation & RPI_IPA_CONFIG_LS_TABLE) {
-		/* Remove any previous table, if there was one. */
-		if (lsTable_) {
-			munmap(lsTable_, MAX_LS_GRID_SIZE);
-			lsTable_ = nullptr;
-		}
-
-		/* Map the LS table buffer into user space. */
-		lsTableHandle_ = FileDescriptor(ipaConfig.data[0]);
-		if (lsTableHandle_.isValid()) {
-			lsTable_ = mmap(nullptr, MAX_LS_GRID_SIZE, PROT_READ | PROT_WRITE,
-					MAP_SHARED, lsTableHandle_.fd(), 0);
-
-			if (lsTable_ == MAP_FAILED) {
-				LOG(IPARPI, Error) << "dmaHeap mmap failure for LS table.";
-				lsTable_ = nullptr;
-			}
-		}
-	}
 }
 
 void IPARPi::mapBuffers(const std::vector<IPABuffer> &buffers)
diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index 9d183e3..2fdf79f 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -1141,6 +1141,9 @@ int RPiCameraData::configureIPA()
 	entityControls.emplace(0, unicam_[Unicam::Image].dev()->controls());
 	entityControls.emplace(1, isp_[Isp::Input].dev()->controls());
 
+	/* Always send the user transform to the IPA. */
+	ipaConfig.data = { static_cast<unsigned int>(transform_) };
+
 	/* Allocate the lens shading table via dmaHeap and pass to the IPA. */
 	if (!lsTable_.isValid()) {
 		lsTable_ = dmaHeap_.alloc("ls_grid", MAX_LS_GRID_SIZE);
@@ -1149,7 +1152,7 @@ int RPiCameraData::configureIPA()
 
 		/* Allow the IPA to mmap the LS table via the file descriptor. */
 		ipaConfig.operation = RPI_IPA_CONFIG_LS_TABLE;
-		ipaConfig.data = { static_cast<unsigned int>(lsTable_.fd()) };
+		ipaConfig.data.push_back(static_cast<unsigned int>(lsTable_.fd()));
 	}
 
 	CameraSensorInfo sensorInfo = {};
-- 
2.20.1