libcamera: ipu3: imgu: Calculate ImgU pipe configuration

Instrument the ImgU component to dynamically calculate the image
manipulation pipeline intermediate sizes.

To correctly configure the ImgU it is necessary to program the IF, BDS
and GDC sizes, which are currently fixed to the input frame size.

The procedure used to calculate the intermediate sizes has been ported
from the pipe_config.py python script, available at:
https://github.com/intel/intel-ipu3-pipecfg
at revision:
61e83f2f7606 ("Add more information into README")

Define two structures (ImgUDevice::Pipe and ImgUDevice::PipeConfig)
to allow the pipeline handler to supply and retrieve configuration
parameters from the ImgU.

Finally, add a new operation to the ImgUDevice that calculates
the pipe configuration parameters based on the requested input and
output sizes.

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/libcamera/pipeline/ipu3/imgu.h b/src/libcamera/pipeline/ipu3/imgu.h
index 23ec1ca1..2f9dc022 100644
--- a/src/libcamera/pipeline/ipu3/imgu.h
+++ b/src/libcamera/pipeline/ipu3/imgu.h
@@ -23,8 +23,28 @@ struct StreamConfiguration;
 class ImgUDevice
 {
 public:
+	struct PipeConfig {
+		float bds_sf;
+		Size iif;
+		Size bds;
+		Size gdc;
+
+		bool isNull() const
+		{
+			return iif.isNull() || bds.isNull() || gdc.isNull();
+		}
+	};
+
+	struct Pipe {
+		Size input;
+		Size main;
+		Size viewfinder;
+	};
+
 	int init(MediaDevice *media, unsigned int index);
 
+	PipeConfig calculatePipeConfig(Pipe *pipe);
+
 	int configureInput(const Size &size, V4L2DeviceFormat *inputFormat);
 
 	int configureOutput(const StreamConfiguration &cfg,