pipeline: ipa: raspberrypi: Change Unicam timeout handling

Add an explicit helper function setCameraTimeout() in the pipeline
handler to set the Unicam timeout value. This function is signalled from
the IPA to set up an appropriate timeout. This replaces the
maxSensorFrameLengthMs value parameter returned back from
IPARPi::start().

Adjust the timeout to be 5x the maximum frame duration reported by the
IPA.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

3 files changed, 18 insertions, 10 deletions

diff --git a/include/libcamera/ipa/raspberrypi.mojom b/include/libcamera/ipa/raspberrypi.mojom
index 8e78f167..80e01266 100644
--- a/include/libcamera/ipa/raspberrypi.mojom
+++ b/include/libcamera/ipa/raspberrypi.mojom
@@ -49,7 +49,6 @@ struct IPAConfigResult {
 struct StartConfig {
 	libcamera.ControlList controls;
 	int32 dropFrameCount;
-	uint32 maxSensorFrameLengthMs;
 };
 
 interface IPARPiInterface {
@@ -132,4 +131,5 @@ interface IPARPiEventInterface {
 	setIspControls(libcamera.ControlList controls);
 	setDelayedControls(libcamera.ControlList controls, uint32 delayContext);
 	setLensControls(libcamera.ControlList controls);
+	setCameraTimeout(uint32 maxFrameLengthMs);
 };
diff --git a/src/ipa/raspberrypi/raspberrypi.cpp b/src/ipa/raspberrypi/raspberrypi.cpp
index 9b08ae4c..f6826bf2 100644
--- a/src/ipa/raspberrypi/raspberrypi.cpp
+++ b/src/ipa/raspberrypi/raspberrypi.cpp
@@ -341,7 +341,7 @@ void IPARPi::start(const ControlList &controls, StartConfig *startConfig)
 
 	startConfig->dropFrameCount = dropFrameCount_;
 	const Duration maxSensorFrameDuration = mode_.maxFrameLength * mode_.maxLineLength;
-	startConfig->maxSensorFrameLengthMs = maxSensorFrameDuration.get<std::milli>();
+	setCameraTimeout.emit(maxSensorFrameDuration.get<std::milli>());
 
 	firstStart_ = false;
 	lastRunTimestamp_ = 0;
diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index 84120954..3d04842a 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -212,6 +212,7 @@ public:
 	void setIspControls(const ControlList &controls);
 	void setDelayedControls(const ControlList &controls, uint32_t delayContext);
 	void setLensControls(const ControlList &controls);
+	void setCameraTimeout(uint32_t maxExposureTimeMs);
 	void setSensorControls(ControlList &controls);
 	void unicamTimeout();
 
@@ -1166,14 +1167,6 @@ int PipelineHandlerRPi::start(Camera *camera, const ControlList *controls)
 		}
 	}
 
-	/*
-	 * Set the dequeue timeout to the larger of 2x the maximum possible
-	 * frame duration or 1 second.
-	 */
-	utils::Duration timeout =
-		std::max<utils::Duration>(1s, 2 * startConfig.maxSensorFrameLengthMs * 1ms);
-	data->unicam_[Unicam::Image].dev()->setDequeueTimeout(timeout);
-
 	return 0;
 }
 
@@ -1645,6 +1638,7 @@ int RPiCameraData::loadIPA(ipa::RPi::IPAInitResult *result)
 	ipa_->setIspControls.connect(this, &RPiCameraData::setIspControls);
 	ipa_->setDelayedControls.connect(this, &RPiCameraData::setDelayedControls);
 	ipa_->setLensControls.connect(this, &RPiCameraData::setLensControls);
+	ipa_->setCameraTimeout.connect(this, &RPiCameraData::setCameraTimeout);
 
 	/*
 	 * The configuration (tuning file) is made from the sensor name unless
@@ -1957,6 +1951,20 @@ void RPiCameraData::setLensControls(const ControlList &controls)
 	}
 }
 
+void RPiCameraData::setCameraTimeout(uint32_t maxFrameLengthMs)
+{
+	/*
+	 * Set the dequeue timeout to the larger of 5x the maximum reported
+	 * frame length advertised by the IPA over a number of frames. Allow
+	 * a minimum timeout value of 1s.
+	 */
+	utils::Duration timeout =
+		std::max<utils::Duration>(1s, 5 * maxFrameLengthMs * 1ms);
+
+	LOG(RPI, Debug) << "Setting Unicam timeout to " << timeout;
+	unicam_[Unicam::Image].dev()->setDequeueTimeout(timeout);
+}
+
 void RPiCameraData::setSensorControls(ControlList &controls)
 {
 	/*