media: nxp: Add dev_err_probe() to all error paths in *async_register() helpers

Add dev_err_probe() to all error branches in the *async_register() helpers
to provide clearer diagnostic information when device registration fails.

Drop the explicit error message after returning from
mipi_csis_async_register(), as the error is already reported by this
helper.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20260121-cam_cleanup-v5-1-01d1ab38db9d@nxp.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

2 files changed, 35 insertions, 23 deletions

diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
index 9a43fd1eb0bc..5f9691d76434 100644
--- a/drivers/media/platform/nxp/imx-mipi-csis.c
+++ b/drivers/media/platform/nxp/imx-mipi-csis.c
@@ -1359,18 +1359,18 @@ static int mipi_csis_async_register(struct mipi_csis_device *csis)
 		fwnode_graph_get_endpoint_by_id(dev_fwnode(csis->dev), 0, 0,
 						FWNODE_GRAPH_ENDPOINT_NEXT);
 	if (!ep)
-		return -ENOTCONN;
+		return dev_err_probe(csis->dev, -ENOTCONN,
+				     "failed to get local endpoint\n");
 
 	ret = v4l2_fwnode_endpoint_parse(ep, &vep);
 	if (ret)
-		return ret;
+		return dev_err_probe(csis->dev, ret,
+				     "failed to parse endpoint\n");
 
 	for (i = 0; i < vep.bus.mipi_csi2.num_data_lanes; ++i) {
-		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1) {
-			dev_err(csis->dev,
-				"data lanes reordering is not supported");
-			return -EINVAL;
-		}
+		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1)
+			return dev_err_probe(csis->dev, -EINVAL,
+					     "data lanes reordering is not supported\n");
 	}
 
 	csis->bus = vep.bus.mipi_csi2;
@@ -1382,15 +1382,22 @@ static int mipi_csis_async_register(struct mipi_csis_device *csis)
 	asd = v4l2_async_nf_add_fwnode_remote(&csis->notifier, ep,
 					      struct v4l2_async_connection);
 	if (IS_ERR(asd))
-		return PTR_ERR(asd);
+		return dev_err_probe(csis->dev, PTR_ERR(asd),
+				     "failed to add remote fwnode to notifier\n");
 
 	csis->notifier.ops = &mipi_csis_notify_ops;
 
 	ret = v4l2_async_nf_register(&csis->notifier);
 	if (ret)
-		return ret;
+		return dev_err_probe(csis->dev, ret,
+				     "failed to register notifier\n");
 
-	return v4l2_async_register_subdev(&csis->sd);
+	ret = v4l2_async_register_subdev(&csis->sd);
+	if (ret)
+		return dev_err_probe(csis->dev, ret,
+				     "failed to register subdev\n");
+
+	return 0;
 }
 
 /* -----------------------------------------------------------------------------
@@ -1549,10 +1556,8 @@ static int mipi_csis_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, &csis->sd);
 
 	ret = mipi_csis_async_register(csis);
-	if (ret < 0) {
-		dev_err(dev, "async register failed: %d\n", ret);
+	if (ret < 0)
 		goto err_cleanup;
-	}
 
 	/* Initialize debugfs. */
 	mipi_csis_debugfs_init(csis);
diff --git a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
index e111b1debd69..0d056021113a 100644
--- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
+++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
@@ -727,18 +727,18 @@ static int imx8mq_mipi_csi_async_register(struct csi_state *state)
 		fwnode_graph_get_endpoint_by_id(dev_fwnode(state->dev), 0, 0,
 						FWNODE_GRAPH_ENDPOINT_NEXT);
 	if (!ep)
-		return -ENOTCONN;
+		return dev_err_probe(state->dev, -ENOTCONN,
+				     "failed to get local endpoint fwnode\n");
 
 	ret = v4l2_fwnode_endpoint_parse(ep, &vep);
 	if (ret)
-		return ret;
+		return dev_err_probe(state->dev, ret,
+				     "failed to parse endpoint\n");
 
 	for (i = 0; i < vep.bus.mipi_csi2.num_data_lanes; ++i) {
-		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1) {
-			dev_err(state->dev,
-				"data lanes reordering is not supported");
-			return -EINVAL;
-		}
+		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1)
+			return dev_err_probe(state->dev, -EINVAL,
+					     "data lanes reordering is not supported");
 	}
 
 	state->bus = vep.bus.mipi_csi2;
@@ -750,15 +750,22 @@ static int imx8mq_mipi_csi_async_register(struct csi_state *state)
 	asd = v4l2_async_nf_add_fwnode_remote(&state->notifier, ep,
 					      struct v4l2_async_connection);
 	if (IS_ERR(asd))
-		return PTR_ERR(asd);
+		return dev_err_probe(state->dev, PTR_ERR(asd),
+				     "failed to add fwnode to notifier\n");
 
 	state->notifier.ops = &imx8mq_mipi_csi_notify_ops;
 
 	ret = v4l2_async_nf_register(&state->notifier);
 	if (ret)
-		return ret;
+		return dev_err_probe(state->dev, ret,
+				     "failed to register notifier\n");
 
-	return v4l2_async_register_subdev(&state->sd);
+	ret = v4l2_async_register_subdev(&state->sd);
+	if (ret)
+		return dev_err_probe(state->dev, ret,
+				     "failed to register subdev\n");
+
+	return 0;
 }
 
 /* -----------------------------------------------------------------------------