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Subject[RESEND PATCH v3 15/17] media: imx: Create missing links from CSI-2 receiver
Date
The entities external to the i.MX6 IPU and i.MX7 now create the links
to their fwnode-endpoint connected entities in their notifier bound
callbacks. Which means imx_media_create_of_links() and
imx_media_create_csi_of_links() are no longer needed and are removed.

However there is still one case in which imx-media needs to create
fwnode-endpoint based links at probe completion. The v4l2-async framework
does not allow multiple subdevice notifiers to contain a duplicate
subdevice in their asd_list. Only the first subdev notifier that discovers
and adds that one subdevice to its asd_list will receive a bound callback
for it. Other subdevices that also have firmware endpoint connections to
this duplicate subdevice will not have it in their asd_list, and thus will
never receive a bound callback for it. In the case of imx-media, the one
duplicate subdevice in question is the i.MX6 MIPI CSI-2 receiver.

Until there is a solution to that problem, rewrite imx_media_create_links()
to add the missing links from the CSI-2 receiver to the CSIs and CSI muxes.
The function is renamed imx_media_create_csi2_links().

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
Changes in v3:
- call a local imx-media utility imx_media_create_fwnode_pad_links().
Changes in v2:
- this is a rewrite of v1 "media: imx: Use media_create_fwnode_links for
external links", which only adds the missing CSI-2 receiver links.
---
.../staging/media/imx/imx-media-dev-common.c | 46 +++----
drivers/staging/media/imx/imx-media-of.c | 114 ------------------
drivers/staging/media/imx/imx-media.h | 4 -
3 files changed, 17 insertions(+), 147 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-dev-common.c b/drivers/staging/media/imx/imx-media-dev-common.c
index 66b505f7e8df..f7ad3cbbeec2 100644
--- a/drivers/staging/media/imx/imx-media-dev-common.c
+++ b/drivers/staging/media/imx/imx-media-dev-common.c
@@ -30,41 +30,31 @@ static int imx_media_subdev_bound(struct v4l2_async_notifier *notifier,
}

/*
- * Create the media links for all subdevs that registered.
+ * Create the missing media links from the CSI-2 receiver.
* Called after all async subdevs have bound.
*/
-static int imx_media_create_links(struct v4l2_async_notifier *notifier)
+static void imx_media_create_csi2_links(struct imx_media_dev *imxmd)
{
- struct imx_media_dev *imxmd = notifier2dev(notifier);
- struct v4l2_subdev *sd;
+ struct v4l2_subdev *sd, *csi2 = NULL;

list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
- switch (sd->grp_id) {
- case IMX_MEDIA_GRP_ID_IPU_VDIC:
- case IMX_MEDIA_GRP_ID_IPU_IC_PRP:
- case IMX_MEDIA_GRP_ID_IPU_IC_PRPENC:
- case IMX_MEDIA_GRP_ID_IPU_IC_PRPVF:
- /*
- * links have already been created for the
- * sync-registered subdevs.
- */
- break;
- case IMX_MEDIA_GRP_ID_IPU_CSI0:
- case IMX_MEDIA_GRP_ID_IPU_CSI1:
- case IMX_MEDIA_GRP_ID_CSI:
- imx_media_create_csi_of_links(imxmd, sd);
- break;
- default:
- /*
- * if this subdev has fwnode links, create media
- * links for them.
- */
- imx_media_create_of_links(imxmd, sd);
+ if (sd->grp_id == IMX_MEDIA_GRP_ID_CSI2) {
+ csi2 = sd;
break;
}
}
+ if (!csi2)
+ return;

- return 0;
+ list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
+ /* skip if not a CSI or a video mux */
+ if (!(sd->grp_id & IMX_MEDIA_GRP_ID_IPU_CSI) &&
+ !(sd->grp_id & IMX_MEDIA_GRP_ID_CSI) &&
+ sd->entity.function != MEDIA_ENT_F_VID_MUX)
+ continue;
+
+ imx_media_create_fwnode_pad_links(csi2, sd);
+ }
}

/*
@@ -196,9 +186,7 @@ int imx_media_probe_complete(struct v4l2_async_notifier *notifier)

mutex_lock(&imxmd->mutex);

- ret = imx_media_create_links(notifier);
- if (ret)
- goto unlock;
+ imx_media_create_csi2_links(imxmd);

ret = imx_media_create_pad_vdev_lists(imxmd);
if (ret)
diff --git a/drivers/staging/media/imx/imx-media-of.c b/drivers/staging/media/imx/imx-media-of.c
index 2d3efd2a6dde..82e13e972e23 100644
--- a/drivers/staging/media/imx/imx-media-of.c
+++ b/drivers/staging/media/imx/imx-media-of.c
@@ -74,117 +74,3 @@ int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
return ret;
}
EXPORT_SYMBOL_GPL(imx_media_add_of_subdevs);
-
-/*
- * Create a single media link to/from sd using a fwnode link.
- *
- * NOTE: this function assumes an OF port node is equivalent to
- * a media pad (port id equal to media pad index), and that an
- * OF endpoint node is equivalent to a media link.
- */
-static int create_of_link(struct imx_media_dev *imxmd,
- struct v4l2_subdev *sd,
- struct v4l2_fwnode_link *link)
-{
- struct v4l2_subdev *remote, *src, *sink;
- int src_pad, sink_pad;
-
- if (link->local_port >= sd->entity.num_pads)
- return -EINVAL;
-
- remote = imx_media_find_subdev_by_fwnode(imxmd, link->remote_node);
- if (!remote)
- return 0;
-
- if (sd->entity.pads[link->local_port].flags & MEDIA_PAD_FL_SINK) {
- src = remote;
- src_pad = link->remote_port;
- sink = sd;
- sink_pad = link->local_port;
- } else {
- src = sd;
- src_pad = link->local_port;
- sink = remote;
- sink_pad = link->remote_port;
- }
-
- /* make sure link doesn't already exist before creating */
- if (media_entity_find_link(&src->entity.pads[src_pad],
- &sink->entity.pads[sink_pad]))
- return 0;
-
- v4l2_info(sd->v4l2_dev, "%s:%d -> %s:%d\n",
- src->name, src_pad, sink->name, sink_pad);
-
- return media_create_pad_link(&src->entity, src_pad,
- &sink->entity, sink_pad, 0);
-}
-
-/*
- * Create media links to/from sd using its device-tree endpoints.
- */
-int imx_media_create_of_links(struct imx_media_dev *imxmd,
- struct v4l2_subdev *sd)
-{
- struct v4l2_fwnode_link link;
- struct device_node *ep;
- int ret;
-
- for_each_endpoint_of_node(sd->dev->of_node, ep) {
- ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
- if (ret)
- continue;
-
- ret = create_of_link(imxmd, sd, &link);
- v4l2_fwnode_put_link(&link);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(imx_media_create_of_links);
-
-/*
- * Create media links to the given CSI subdevice's sink pads,
- * using its device-tree endpoints.
- */
-int imx_media_create_csi_of_links(struct imx_media_dev *imxmd,
- struct v4l2_subdev *csi)
-{
- struct device_node *csi_np = csi->dev->of_node;
- struct device_node *ep;
-
- for_each_child_of_node(csi_np, ep) {
- struct fwnode_handle *fwnode, *csi_ep;
- struct v4l2_fwnode_link link;
- int ret;
-
- memset(&link, 0, sizeof(link));
-
- link.local_node = of_fwnode_handle(csi_np);
- link.local_port = CSI_SINK_PAD;
-
- csi_ep = of_fwnode_handle(ep);
-
- fwnode = fwnode_graph_get_remote_endpoint(csi_ep);
- if (!fwnode)
- continue;
-
- fwnode = fwnode_get_parent(fwnode);
- fwnode_property_read_u32(fwnode, "reg", &link.remote_port);
- fwnode = fwnode_get_next_parent(fwnode);
- if (is_of_node(fwnode) &&
- of_node_name_eq(to_of_node(fwnode), "ports"))
- fwnode = fwnode_get_next_parent(fwnode);
- link.remote_node = fwnode;
-
- ret = create_of_link(imxmd, csi, &link);
- fwnode_handle_put(link.remote_node);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(imx_media_create_csi_of_links);
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index 5f23d852122f..5271b84bea9a 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -248,10 +248,6 @@ void imx_media_unregister_ipu_internal_subdevs(struct imx_media_dev *imxmd);
/* imx-media-of.c */
int imx_media_add_of_subdevs(struct imx_media_dev *dev,
struct device_node *np);
-int imx_media_create_of_links(struct imx_media_dev *imxmd,
- struct v4l2_subdev *sd);
-int imx_media_create_csi_of_links(struct imx_media_dev *imxmd,
- struct v4l2_subdev *csi);
int imx_media_of_add_csi(struct imx_media_dev *imxmd,
struct device_node *csi_np);

--
2.17.1
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