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media: nxp: imx8-isi: Add stream ID validation for crossbar routing

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Add validation to enforce hardware constraints that were previously
missing in the crossbar routing configuration:

- SOURCE stream must be 0 (ISI pipes are hardcoded to stream 0)

This check complements the existing memory input validation and ensures
that all routing configurations respect hardware limitations.

Signed-off-by: Guoniu Zhou <guoniu.zhou@oss.nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20260720-isi-v2-2-45845bc5d4fa@oss.nxp.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Guoniu Zhou 2026-07-20 11:34:04 +08:00 committed by Hans Verkuil
parent 795bd28635
commit 162a2a2de6
1 changed files with 13 additions and 1 deletions
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14
drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c
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@ -106,8 +106,20 @@ static int __mxc_isi_crossbar_set_routing(struct v4l2_subdev *sd,
if (ret)
return ret;
/* The memory input can be routed to the first pipeline only. */
/*
* Validate routes against hardware constraints:
* - SOURCE stream must be 0 (pipes are hardcoded to stream 0)
* - Memory input can only route to the first pipeline
*/
for_each_active_route(routing, route) {
if (route->source_stream != 0) {
dev_dbg(xbar->isi->dev,
"route to pipe %u must use source_stream=0, got %u\n",
route->source_pad - xbar->num_sinks,
route->source_stream);
return -ENXIO;
}
if (route->sink_pad == xbar->num_sinks - 1 &&
route->source_pad != xbar->num_sinks) {
dev_dbg(xbar->isi->dev,