On Thu, Apr 19, 2018 at 11:17:59AM +0100, Rui Miguel Silva wrote:
> +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;
> + }
> +
> + goto init;
> + }
> +
> + /* source pad */
> + if (flags & MEDIA_LNK_FL_ENABLED) {
> + if (csi->sink) {
> + ret = -EBUSY;
> + goto unlock;
> + }
> + csi->sink = remote->entity;
> + } else {
> + v4l2_ctrl_handler_free(&csi->ctrl_hdlr);
> + v4l2_ctrl_handler_init(&csi->ctrl_hdlr, 0);
> + csi->sink = NULL;
> + }
> +
> +init:
> + if (csi->sink || csi->src_sd)
> + imx7_csi_init(csi);
> + else
> + imx7_csi_deinit(csi);
> +
> +unlock:
> + mutex_unlock(&csi->lock);
> +
> + return 0;
This should be "return ret;" because the failure paths go through here
as well.
> +}
> +
> +static int imx7_csi_pad_link_validate(struct v4l2_subdev *sd,
> + struct media_link *link,
> + struct v4l2_subdev_format *source_fmt,
> + struct v4l2_subdev_format *sink_fmt)
> +{
> + struct imx7_csi *csi = v4l2_get_subdevdata(sd);
> + struct v4l2_fwnode_endpoint upstream_ep;
> + int ret;
> +
> + ret = v4l2_subdev_link_validate_default(sd, link, source_fmt, sink_fmt);
> + if (ret)
> + return ret;
> +
> + ret = imx7_csi_get_upstream_endpoint(csi, &upstream_ep, true);
> + if (ret) {
> + v4l2_err(&csi->sd, "failed to find upstream endpoint\n");
> + return ret;
> + }
> +
> + mutex_lock(&csi->lock);
> +
> + csi->upstream_ep = upstream_ep;
> + csi->is_csi2 = (upstream_ep.bus_type == V4L2_MBUS_CSI2);
> +
> + mutex_unlock(&csi->lock);
> +
> + return ret;
return 0;
> +}
> +
[ snip ]
> +
> +static int imx7_csi_remove(struct platform_device *pdev)
> +{
> + return 0;
> +}
There is no need for this empty (struct platform_driver)->remove()
function. See platform_drv_remove() for how it's called.
This looks nice, though.
regards,
dan carpenter
