[libcamera-devel] [IPU3-IPA PATCH] ipu3: Initialise controls in the IPA

[Kieran Bingham]

In commit 11fe4333c54d ("libcamera: ipu3: Initialize controls in the
IPA") the interface for the IPA was updated and the creation of exposure
and frame duration controls are now the responsibility of the IPA.

In libcamera, the code that creates these controls was moved to the
integrated IPA for the IPU3.

Duplicate the implementation here.

Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 ipu3.cpp | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 56 insertions(+), 2 deletions(-)

diff --git a/ipu3.cpp b/ipu3.cpp
index b8015af20454..3e89e6dd4e02 100644
--- a/ipu3.cpp
+++ b/ipu3.cpp
@@ -36,7 +36,10 @@ namespace ipa::ipu3 {
 class IPAIPU3 : public IPAIPU3Interface
 {
 public:
-	int init(const IPASettings &settings) override;
+	int init(const IPASettings &settings,
+		 const IPACameraSensorInfo &sensorInfo,
+		 const ControlInfoMap &sensorControls,
+		 ControlInfoMap *ipaControls) override;
 
 	int start() override;
 	void stop() override {}
@@ -83,7 +86,10 @@ private:
 	BinaryData aiqd_;
 };
 
-int IPAIPU3::init(const IPASettings &settings)
+int IPAIPU3::init(const IPASettings &settings,
+		  const IPACameraSensorInfo &sensorInfo,
+		  const ControlInfoMap &sensorControls,
+		  ControlInfoMap *ipaControls)
 {
 	int ret;
 
@@ -135,6 +141,54 @@ int IPAIPU3::init(const IPASettings &settings)
 
 	aiqInputParams_.init();
 
+	/* Initialize Controls. */
+	ControlInfoMap::Map controls{};
+
+	/*
+	 * Compute exposure time limits.
+	 *
+	 * Initialize the control using the line length and pixel rate of the
+	 * current configuration converted to microseconds. Use the
+	 * V4L2_CID_EXPOSURE control to get exposure min, max and default and
+	 * convert it from lines to microseconds.
+	 */
+	double lineDuration = sensorInfo.lineLength / (sensorInfo.pixelRate / 1e6);
+	const ControlInfo &v4l2Exposure = sensorControls.find(V4L2_CID_EXPOSURE)->second;
+	int32_t minExposure = v4l2Exposure.min().get<int32_t>() * lineDuration;
+	int32_t maxExposure = v4l2Exposure.max().get<int32_t>() * lineDuration;
+	int32_t defExposure = v4l2Exposure.def().get<int32_t>() * lineDuration;
+	controls[&controls::ExposureTime] = ControlInfo(minExposure, maxExposure,
+							defExposure);
+
+	/*
+	 * Compute the frame duration limits.
+	 *
+	 * The frame length is computed assuming a fixed line length combined
+	 * with the vertical frame sizes.
+	 */
+	const ControlInfo &v4l2HBlank = sensorControls.find(V4L2_CID_HBLANK)->second;
+	uint32_t hblank = v4l2HBlank.def().get<int32_t>();
+	uint32_t lineLength = sensorInfo.outputSize.width + hblank;
+
+	const ControlInfo &v4l2VBlank = sensorControls.find(V4L2_CID_VBLANK)->second;
+	std::array<uint32_t, 3> frameHeights{
+		v4l2VBlank.min().get<int32_t>() + sensorInfo.outputSize.height,
+		v4l2VBlank.max().get<int32_t>() + sensorInfo.outputSize.height,
+		v4l2VBlank.def().get<int32_t>() + sensorInfo.outputSize.height,
+	};
+
+	std::array<int64_t, 3> frameDurations;
+	for (unsigned int i = 0; i < frameHeights.size(); ++i) {
+		uint64_t frameSize = lineLength * frameHeights[i];
+		frameDurations[i] = frameSize / (sensorInfo.pixelRate / 1000000U);
+	}
+
+	controls[&controls::FrameDurationLimits] = ControlInfo(frameDurations[0],
+							       frameDurations[1],
+							       frameDurations[2]);
+
+	*ipaControls = ControlInfoMap(std::move(controls), controls::controls);
+
 	return 0;
 }
 
-- 
2.30.2