[PATCH v4 02/13] media: nxp: imx8-isi: Allow num_sources to be greater than num_sink

[Frank Li]

Allow num_sources (drvdata: num_channels) to be greater than num_sink
(drvdata: num_ports + 1).

ISI support stream multiplexing, such as differentiates multiple cameras
from a single 2-lane MIPI input, or duplicates input stream into multiple
outputs. So num_channels may be greater than num_ports at some platform.

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
change from v3 to v4
- use routing.num_routes = min(xbar->num_sinks - 1, xbar->num_sources)
- replace xbar->num_sinks - 1 with routing.num_routes

change from v1 to v3
- none
---
 drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c
index 93a55c97cd173..55454445359f4 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c
@@ -188,11 +188,12 @@ static int mxc_isi_crossbar_init_state(struct v4l2_subdev *sd,
 	 * Create a 1:1 mapping between pixel link inputs and outputs to
 	 * pipelines by default.
 	 */
-	routes = kcalloc(xbar->num_sources, sizeof(*routes), GFP_KERNEL);
+	routing.num_routes = min(xbar->num_sinks - 1, xbar->num_sources);
+	routes = kcalloc(routing.num_routes, sizeof(*routes), GFP_KERNEL);
 	if (!routes)
 		return -ENOMEM;
 
-	for (i = 0; i < xbar->num_sources; ++i) {
+	for (i = 0; i < routing.num_routes; ++i) {
 		struct v4l2_subdev_route *route = &routes[i];
 
 		route->sink_pad = i;
@@ -200,7 +201,6 @@ static int mxc_isi_crossbar_init_state(struct v4l2_subdev *sd,
 		route->flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE;
 	}
 
-	routing.num_routes = xbar->num_sources;
 	routing.routes = routes;
 
 	ret = __mxc_isi_crossbar_set_routing(sd, state, &routing);
@@ -453,7 +453,7 @@ int mxc_isi_crossbar_init(struct mxc_isi_dev *isi)
 	 * the memory input.
 	 */
 	xbar->num_sinks = isi->pdata->num_ports + 1;
-	xbar->num_sources = isi->pdata->num_ports;
+	xbar->num_sources = isi->pdata->num_channels;
 	num_pads = xbar->num_sinks + xbar->num_sources;
 
 	xbar->pads = kcalloc(num_pads, sizeof(*xbar->pads), GFP_KERNEL);

-- 
2.34.1