Re: [PATCH 1/2] omap3isp: Add resizer data rate configuration to resizer_link_validate

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Sakari,

Thanks for the patch.

On Sunday 21 October 2012 00:48:17 Sakari Ailus wrote:
> The configuration of many other blocks depend on resizer maximum data rate.
> Get the value from resizer at link validation time.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
>  drivers/media/platform/omap3isp/ispresizer.c |   15 +++++++
>  drivers/media/platform/omap3isp/ispvideo.c   |   54 -----------------------
>  2 files changed, 15 insertions(+), 54 deletions(-)
> 
> diff --git a/drivers/media/platform/omap3isp/ispresizer.c
> b/drivers/media/platform/omap3isp/ispresizer.c index d11fb26..bb5fb4a
> 100644
> --- a/drivers/media/platform/omap3isp/ispresizer.c
> +++ b/drivers/media/platform/omap3isp/ispresizer.c
> @@ -1532,6 +1532,20 @@ static int resizer_set_format(struct v4l2_subdev *sd,
> struct v4l2_subdev_fh *fh, return 0;
>  }
> 
> +static int resizer_link_validate(struct v4l2_subdev *sd,
> +				 struct media_link *link,
> +				 struct v4l2_subdev_format *source_fmt,
> +				 struct v4l2_subdev_format *sink_fmt)
> +{
> +	struct isp_res_device *res = v4l2_get_subdevdata(sd);
> +	struct isp_pipeline *pipe = to_isp_pipeline(&sd->entity);
> +
> +	omap3isp_resizer_max_rate(res, &pipe->max_rate);
> +
> +	return v4l2_subdev_link_validate_default(sd, link,
> +						 source_fmt, sink_fmt);
> +}
> +
>  /*
>   * resizer_init_formats - Initialize formats on all pads
>   * @sd: ISP resizer V4L2 subdevice
> @@ -1570,6 +1584,7 @@ static const struct v4l2_subdev_pad_ops
> resizer_v4l2_pad_ops = { .set_fmt = resizer_set_format,
>  	.get_selection = resizer_get_selection,
>  	.set_selection = resizer_set_selection,
> +	.link_validate = resizer_link_validate,
>  };
> 
>  /* subdev operations */
> diff --git a/drivers/media/platform/omap3isp/ispvideo.c
> b/drivers/media/platform/omap3isp/ispvideo.c index a0b737fe..aae70f7 100644
> --- a/drivers/media/platform/omap3isp/ispvideo.c
> +++ b/drivers/media/platform/omap3isp/ispvideo.c
> @@ -280,55 +280,6 @@ static int isp_video_get_graph_data(struct isp_video
> *video, return 0;
>  }
> 
> -/*
> - * Validate a pipeline by checking both ends of all links for format
> - * discrepancies.
> - *
> - * Compute the minimum time per frame value as the maximum of time per
> frame - * limits reported by every block in the pipeline.
> - *
> - * Return 0 if all formats match, or -EPIPE if at least one link is found
> with - * different formats on its two ends or if the pipeline doesn't start
> with a - * video source (either a subdev with no input pad, or a non-subdev
> entity). - */
> -static int isp_video_validate_pipeline(struct isp_pipeline *pipe)
> -{
> -	struct isp_device *isp = pipe->output->isp;
> -	struct media_pad *pad;
> -	struct v4l2_subdev *subdev;
> -
> -	subdev = isp_video_remote_subdev(pipe->output, NULL);
> -	if (subdev == NULL)
> -		return -EPIPE;
> -
> -	while (1) {
> -		/* Retrieve the sink format */
> -		pad = &subdev->entity.pads[0];
> -		if (!(pad->flags & MEDIA_PAD_FL_SINK))
> -			break;
> -
> -		/* Update the maximum frame rate */
> -		if (subdev == &isp->isp_res.subdev)
> -			omap3isp_resizer_max_rate(&isp->isp_res,
> -						  &pipe->max_rate);
> -
> -		/* Retrieve the source format. Return an error if no source
> -		 * entity can be found, and stop checking the pipeline if the
> -		 * source entity isn't a subdev.
> -		 */
> -		pad = media_entity_remote_source(pad);
> -		if (pad == NULL)
> -			return -EPIPE;

I think we're loosing this check if you remove this function. A pipeline with 
no source will not be flagged as invalid. Maybe it would be possible to move 
this check to the media core.

> -
> -		if (media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
> -			break;
> -
> -		subdev = media_entity_to_v4l2_subdev(pad->entity);
> -	}
> -
> -	return 0;
> -}
> -
>  static int
>  __isp_video_get_format(struct isp_video *video, struct v4l2_format *format)
> {
> @@ -1056,11 +1007,6 @@ isp_video_streamon(struct file *file, void *fh, enum
> v4l2_buf_type type) if (ret < 0)
>  		goto err_check_format;
> 
> -	/* Validate the pipeline and update its state. */
> -	ret = isp_video_validate_pipeline(pipe);
> -	if (ret < 0)
> -		goto err_check_format;
> -
>  	pipe->error = false;
> 
>  	spin_lock_irqsave(&pipe->lock, flags);

-- 
Regards,

Laurent Pinchart