media: imx: Don't register IPU subdevs/links if CSI port missing

commit dee747f8 upstream.

The second IPU internal sub-devices were being registered and links
to them created even when the second IPU is not present. This is wrong
for i.MX6 S/DL and i.MX53 which have only a single IPU.

Fixes: e1302912 ("[media] media: Add i.MX media core driver")
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/imx/imx-media-dev.c

@@ -477,13 +477,6 @@ static int imx_media_probe(struct platform_device *pdev)
 		goto cleanup;
 	}
 
-	ret = imx_media_add_ipu_internal_subdevs(imxmd);
-	if (ret) {
-		v4l2_err(&imxmd->v4l2_dev,
-			 "add_ipu_internal_subdevs failed with %d\n", ret);
-		goto cleanup;
-	}
-
 	ret = imx_media_dev_notifier_register(imxmd);
 	if (ret)
 		goto del_int;

drivers/staging/media/imx/imx-media-internal-sd.c

@@ -298,13 +298,14 @@ static int add_internal_subdev(struct imx_media_dev *imxmd,
 }
 
 /* adds the internal subdevs in one ipu */
-static int add_ipu_internal_subdevs(struct imx_media_dev *imxmd, int ipu_id)
+int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd,
+				       int ipu_id)
 {
 	enum isd_enum i;
+	int ret;
 
 	for (i = 0; i < num_isd; i++) {
 		const struct internal_subdev *isd = &int_subdev[i];
-		int ret;
 
 		/*
 		 * the CSIs are represented in the device-tree, so those
@@ -322,25 +323,10 @@ static int add_ipu_internal_subdevs(struct imx_media_dev *imxmd, int ipu_id)
 		}
 
 		if (ret)
-			return ret;
+			goto remove;
 	}
 
 	return 0;
-}
-
-int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd)
-{
-	int ret;
-
-	ret = add_ipu_internal_subdevs(imxmd, 0);
-	if (ret)
-		goto remove;
-
-	ret = add_ipu_internal_subdevs(imxmd, 1);
-	if (ret)
-		goto remove;
-
-	return 0;
 
 remove:
 	imx_media_remove_ipu_internal_subdevs(imxmd);

drivers/staging/media/imx/imx-media-of.c

@@ -23,36 +23,25 @@
 int imx_media_of_add_csi(struct imx_media_dev *imxmd,
 			 struct device_node *csi_np)
 {
-	int ret;
-
 	if (!of_device_is_available(csi_np)) {
 		dev_dbg(imxmd->md.dev, "%s: %pOFn not enabled\n", __func__,
 			csi_np);
-		/* unavailable is not an error */
-		return 0;
+		return -ENODEV;
 	}
 
 	/* add CSI fwnode to async notifier */
-	ret = imx_media_add_async_subdev(imxmd, of_fwnode_handle(csi_np), NULL);
-	if (ret) {
-		if (ret == -EEXIST) {
-			/* already added, everything is fine */
-			return 0;
-		}
-
-		/* other error, can't continue */
-		return ret;
-	}
-
-	return 0;
+	return imx_media_add_async_subdev(imxmd, of_fwnode_handle(csi_np),
+					  NULL);
 }
 EXPORT_SYMBOL_GPL(imx_media_of_add_csi);
 
 int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
 			     struct device_node *np)
 {
+	bool ipu_found[2] = {false, false};
 	struct device_node *csi_np;
 	int i, ret;
+	u32 ipu_id;
 
 	for (i = 0; ; i++) {
 		csi_np = of_parse_phandle(np, "ports", i);
@@ -60,12 +49,43 @@ int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
 			break;
 
 		ret = imx_media_of_add_csi(imxmd, csi_np);
-		of_node_put(csi_np);
-		if (ret)
-			return ret;
+		if (ret) {
+			/* unavailable or already added is not an error */
+			if (ret == -ENODEV || ret == -EEXIST) {
+				of_node_put(csi_np);
+				continue;
+			}
+
+			/* other error, can't continue */
+			goto err_out;
+		}
+
+		ret = of_alias_get_id(csi_np->parent, "ipu");
+		if (ret < 0)
+			goto err_out;
+		if (ret > 1) {
+			ret = -EINVAL;
+			goto err_out;
+		}
+
+		ipu_id = ret;
+
+		if (!ipu_found[ipu_id]) {
+			ret = imx_media_add_ipu_internal_subdevs(imxmd,
+								 ipu_id);
+			if (ret)
+				goto err_out;
+		}
+
+		ipu_found[ipu_id] = true;
 	}
 
 	return 0;
+
+err_out:
+	imx_media_remove_ipu_internal_subdevs(imxmd);
+	of_node_put(csi_np);
+	return ret;
 }
 
 /*

drivers/staging/media/imx/imx-media.h

@@ -252,7 +252,8 @@ struct imx_media_fim *imx_media_fim_init(struct v4l2_subdev *sd);
 void imx_media_fim_free(struct imx_media_fim *fim);
 
 /* imx-media-internal-sd.c */
-int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd);
+int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd,
+				       int ipu_id);
 int imx_media_create_ipu_internal_links(struct imx_media_dev *imxmd,
 					struct v4l2_subdev *sd);
 void imx_media_remove_ipu_internal_subdevs(struct imx_media_dev *imxmd);

drivers/staging/media/imx/imx7-media-csi.c

@@ -1271,7 +1271,7 @@ static int imx7_csi_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, &csi->sd);
 
 	ret = imx_media_of_add_csi(imxmd, node);
-	if (ret < 0)
+	if (ret < 0 && ret != -ENODEV && ret != -EEXIST)
 		goto cleanup;
 
 	ret = imx_media_dev_notifier_register(imxmd);