[PATCH] pipeline: imx8-isi: Dynamically compute crossbar subdevice's first source.

[Antoine Bouyer]

So far, imx8-isi pipeline supports _symetrical_ crossbar, with same
amount of sink and source pads.

But for some other imx SoCs, such as i.MX8QM or i.MX95, crossbar is not
symetric anymore.

Since each crossbar source is already captured as a pipes_ vector entry,
we use pipes_ vector's size to compute 1st source index.

  "1st source index" = "total number of crossbar pads" - pipes_.count()

Signed-off-by: Antoine Bouyer <antoine.bouyer at nxp.com>
---
 src/libcamera/pipeline/imx8-isi/imx8-isi.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp b/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp
index ecda426a6021..177097ae21d6 100644
--- a/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp
+++ b/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp
@@ -822,7 +822,7 @@ int PipelineHandlerISI::configure(Camera *camera, CameraConfiguration *c)
 	 * routing table instead of resetting it.
 	 */
 	V4L2Subdevice::Routing routing = {};
-	unsigned int xbarFirstSource = crossbar_->entity()->pads().size() / 2 + 1;
+	unsigned int xbarFirstSource = crossbar_->entity()->pads().size() - pipes_.size();
 
 	for (const auto &[idx, config] : utils::enumerate(*c)) {
 		uint32_t sourcePad = xbarFirstSource + idx;
-- 
2.34.1