[libcamera-devel] [PATCH 05/11] libcamera: ipu3: cio2: Return the FrameBuffer pointer used

[Niklas Söderlund]

When adding IPA plumbing to the IPU3 pipeline handler it will be needed
to track witch raw buffer was queued to the CIO2 for a specific request.
Currently if using an internally allocated raw buffer the FrameBuffer is
not exposed outside the CIO2Device as it was not needed. Prepare for the
IPA by exposing which infernal raw buffer is picked for each request,
later changes will associate this with a Request.

Signed-off-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
---
 src/libcamera/pipeline/ipu3/cio2.cpp | 10 +++++++---
 src/libcamera/pipeline/ipu3/cio2.h   |  2 +-
 src/libcamera/pipeline/ipu3/ipu3.cpp |  8 ++++----
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/libcamera/pipeline/ipu3/cio2.cpp b/src/libcamera/pipeline/ipu3/cio2.cpp
index e43ec70fe3e4e0db..1c7b9676f52abdb6 100644
--- a/src/libcamera/pipeline/ipu3/cio2.cpp
+++ b/src/libcamera/pipeline/ipu3/cio2.cpp
@@ -262,7 +262,7 @@ int CIO2Device::stop()
 	return ret;
 }
 
-int CIO2Device::queueBuffer(Request *request, FrameBuffer *rawBuffer)
+FrameBuffer *CIO2Device::queueBuffer(Request *request, FrameBuffer *rawBuffer)
 {
 	FrameBuffer *buffer = rawBuffer;
 
@@ -270,7 +270,7 @@ int CIO2Device::queueBuffer(Request *request, FrameBuffer *rawBuffer)
 	if (!buffer) {
 		if (availableBuffers_.empty()) {
 			LOG(IPU3, Error) << "CIO2 buffer underrun";
-			return -EINVAL;
+			return nullptr;
 		}
 
 		buffer = availableBuffers_.front();
@@ -279,7 +279,11 @@ int CIO2Device::queueBuffer(Request *request, FrameBuffer *rawBuffer)
 
 	buffer->setRequest(request);
 
-	return output_->queueBuffer(buffer);
+	int ret = output_->queueBuffer(buffer);
+	if (ret)
+		return nullptr;
+
+	return buffer;
 }
 
 void CIO2Device::tryReturnBuffer(FrameBuffer *buffer)
diff --git a/src/libcamera/pipeline/ipu3/cio2.h b/src/libcamera/pipeline/ipu3/cio2.h
index fa813a989fd21aec..e8b491a0c104a3e2 100644
--- a/src/libcamera/pipeline/ipu3/cio2.h
+++ b/src/libcamera/pipeline/ipu3/cio2.h
@@ -52,7 +52,7 @@ public:
 	CameraSensor *sensor() { return sensor_; }
 	const CameraSensor *sensor() const { return sensor_; }
 
-	int queueBuffer(Request *request, FrameBuffer *rawBuffer);
+	FrameBuffer *queueBuffer(Request *request, FrameBuffer *rawBuffer);
 	void tryReturnBuffer(FrameBuffer *buffer);
 	Signal<FrameBuffer *> &bufferReady() { return output_->bufferReady; }
 
diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index c559d160084f87e7..62e99a308a6136a7 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -643,10 +643,10 @@ int PipelineHandlerIPU3::queueRequestDevice(Camera *camera, Request *request)
 	 * Queue a buffer on the CIO2, using the raw stream buffer provided in
 	 * the request, if any, or a CIO2 internal buffer otherwise.
 	 */
-	FrameBuffer *rawBuffer = request->findBuffer(&data->rawStream_);
-	error = data->cio2_.queueBuffer(request, rawBuffer);
-	if (error)
-		return error;
+	FrameBuffer *reqRawBuffer = request->findBuffer(&data->rawStream_);
+	FrameBuffer *rawBuffer = data->cio2_.queueBuffer(request, reqRawBuffer);
+	if (!rawBuffer)
+		return -ENOMEM;
 
 	/* Queue all buffers from the request aimed for the ImgU. */
 	for (auto it : request->buffers()) {
-- 
2.29.2