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media: imx: imx7_media-csi: Create immutable link to source device

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The CSI subdev has a single source, the input video mux. There's thus a
single link between the source and the CSI, which can be made immutable
and enabled to simplify configuration.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Laurent Pinchart
2021-02-15 05:27:21 +01:00
committed by Mauro Carvalho Chehab
parent dbedd2f490
commit 43664fa55c
1 changed files with 4 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/staging/media/imx/imx7-media-csi.c
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@@ -1065,47 +1065,7 @@ static const struct v4l2_subdev_internal_ops imx7_csi_internal_ops = {
* Media Entity Operations
*/
static int imx7_csi_link_setup(struct media_entity *entity,
const struct media_pad *local,
const struct media_pad *remote, u32 flags)
{
struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
struct imx7_csi *csi = v4l2_get_subdevdata(sd);
struct v4l2_subdev *remote_sd;
int ret = 0;
dev_dbg(csi->dev, "link setup %s -> %s\n", remote->entity->name,
local->entity->name);
mutex_lock(&csi->lock);
if (local->flags & MEDIA_PAD_FL_SINK) {
if (!is_media_entity_v4l2_subdev(remote->entity)) {
ret = -EINVAL;
goto unlock;
}
remote_sd = media_entity_to_v4l2_subdev(remote->entity);
if (flags & MEDIA_LNK_FL_ENABLED) {
if (csi->src_sd) {
ret = -EBUSY;
goto unlock;
}
csi->src_sd = remote_sd;
} else {
csi->src_sd = NULL;
}
}
unlock:
mutex_unlock(&csi->lock);
return ret;
}
static const struct media_entity_operations imx7_csi_entity_ops = {
.link_setup = imx7_csi_link_setup,
.link_validate = v4l2_subdev_link_validate,
.get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
};
@@ -1128,7 +1088,10 @@ static int imx7_csi_notify_bound(struct v4l2_async_notifier *notifier,
if (sd->entity.function == MEDIA_ENT_F_VID_MUX)
sd->grp_id = IMX_MEDIA_GRP_ID_CSI_MUX;
return v4l2_create_fwnode_links_to_pad(sd, sink, 0);
csi->src_sd = sd;
return v4l2_create_fwnode_links_to_pad(sd, sink, MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
}
static const struct v4l2_async_notifier_operations imx7_csi_notify_ops = {