[libcamera-devel] [PATCH v2 04/11] 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 which 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 internal 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>
Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>
---
* Changes since v1
- Update commit message.
---
 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 bd5260d5b28893e8..f76c6675b0f448fe 100644
--- a/src/libcamera/pipeline/ipu3/cio2.cpp
+++ b/src/libcamera/pipeline/ipu3/cio2.cpp
@@ -254,7 +254,7 @@ int CIO2Device::stop()
 	return ret;
 }
 
-int CIO2Device::queueBuffer(Request *request, FrameBuffer *rawBuffer)
+FrameBuffer *CIO2Device::queueBuffer(Request *request, FrameBuffer *rawBuffer)
 {
 	FrameBuffer *buffer = rawBuffer;
 
@@ -262,7 +262,7 @@ 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();
@@ -271,7 +271,11 @@ 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 236ad287354a0bf6..dca4d40e4c32e8b2 100644
--- a/src/libcamera/pipeline/ipu3/cio2.h
+++ b/src/libcamera/pipeline/ipu3/cio2.h
@@ -51,7 +51,7 @@ public:
 	CameraSensor *sensor() { return sensor_.get(); }
 	const CameraSensor *sensor() const { return sensor_.get(); }
 
-	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 3e0e88fa63c4f1fb..a87ce8f3378ba2fe 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