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Subject[RESEND PATCH v3 06/17] media: imx: Add imx_media_create_fwnode_pad_link()
Date
Add functions to create media links between a source and sink subdevice
based on fwnode endpoint connections between them.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
drivers/staging/media/imx/imx-media-utils.c | 91 +++++++++++++++++++++
drivers/staging/media/imx/imx-media.h | 4 +
2 files changed, 95 insertions(+)

diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
index 0788a1874557..87152bd9af22 100644
--- a/drivers/staging/media/imx/imx-media-utils.c
+++ b/drivers/staging/media/imx/imx-media-utils.c
@@ -729,6 +729,97 @@ void imx_media_grp_id_to_sd_name(char *sd_name, int sz, u32 grp_id, int ipu_id)
}
EXPORT_SYMBOL_GPL(imx_media_grp_id_to_sd_name);

+/*
+ * Look for and create a single fwnode link that connects a source
+ * subdevice to a sink pad.
+ */
+int imx_media_create_fwnode_pad_link(struct v4l2_subdev *src_sd,
+ struct media_pad *sink)
+{
+ struct fwnode_handle *endpoint;
+
+ /* loop thru the source's fwnode endpoints */
+ fwnode_graph_for_each_endpoint(dev_fwnode(src_sd->dev), endpoint) {
+ struct fwnode_handle *remote_ep;
+ int src_idx, sink_idx, ret;
+ struct media_pad *src;
+
+ remote_ep = fwnode_graph_get_remote_endpoint(endpoint);
+ if (!remote_ep)
+ continue;
+
+ /*
+ * ask the sink entity to verify that this fwnode link
+ * actually does connect with the entity, and if so that
+ * it connects to its requested sink pad.
+ */
+ sink_idx = media_entity_get_fwnode_pad(sink->entity,
+ remote_ep,
+ MEDIA_PAD_FL_SINK);
+ fwnode_handle_put(remote_ep);
+
+ if (sink_idx < 0 || sink_idx != sink->index)
+ continue;
+
+ src_idx = media_entity_get_fwnode_pad(&src_sd->entity,
+ endpoint,
+ MEDIA_PAD_FL_SOURCE);
+ if (src_idx < 0)
+ continue;
+
+ /*
+ * found the fwnode link that works, create the media
+ * link for it.
+ */
+
+ fwnode_handle_put(endpoint);
+
+ src = &src_sd->entity.pads[src_idx];
+
+ /* success if it already exists */
+ if (media_entity_find_link(src, sink))
+ return 0;
+
+ dev_dbg(src_sd->dev, "%s:%d -> %s:%d\n",
+ src_sd->entity.name, src_idx,
+ sink->entity->name, sink_idx);
+
+ ret = media_create_pad_link(&src_sd->entity, src_idx,
+ sink->entity, sink_idx, 0);
+ if (ret)
+ dev_err(src_sd->dev,
+ "%s:%d -> %s:%d failed with %d\n",
+ src_sd->entity.name, src_idx,
+ sink->entity->name, sink_idx, ret);
+
+ return ret;
+ }
+
+ return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(imx_media_create_fwnode_pad_link);
+
+int imx_media_create_fwnode_pad_links(struct v4l2_subdev *src_sd,
+ struct v4l2_subdev *sink_sd)
+{
+ int i;
+
+ for (i = 0; i < sink_sd->entity.num_pads; i++) {
+ struct media_pad *pad = &sink_sd->entity.pads[i];
+ int ret;
+
+ if (!(pad->flags & MEDIA_PAD_FL_SINK))
+ continue;
+
+ ret = imx_media_create_fwnode_pad_link(src_sd, pad);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(imx_media_create_fwnode_pad_links);
+
struct v4l2_subdev *
imx_media_find_subdev_by_fwnode(struct imx_media_dev *imxmd,
struct fwnode_handle *fwnode)
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index 11861191324a..f90a65ba4ced 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -183,6 +183,10 @@ int imx_media_ipu_image_to_mbus_fmt(struct v4l2_mbus_framefmt *mbus,
struct ipu_image *image);
void imx_media_grp_id_to_sd_name(char *sd_name, int sz,
u32 grp_id, int ipu_id);
+int imx_media_create_fwnode_pad_link(struct v4l2_subdev *src_sd,
+ struct media_pad *sink);
+int imx_media_create_fwnode_pad_links(struct v4l2_subdev *src_sd,
+ struct v4l2_subdev *sink_sd);
struct v4l2_subdev *
imx_media_find_subdev_by_fwnode(struct imx_media_dev *imxmd,
struct fwnode_handle *fwnode);
--
2.17.1
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