Re: [PATCH v8 2/2] rcar-vin: implement EDID control ioctls

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

Hi Ulrich,

Thank you for the patch.

On Thursday 15 Sep 2016 15:24:08 Ulrich Hecht wrote:
> Adds G_EDID and S_EDID.
> 
> Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
> ---
>  drivers/media/platform/rcar-vin/rcar-v4l2.c | 42 ++++++++++++++++++++++++++
>  drivers/media/platform/rcar-vin/rcar-vin.h  |  1 +
>  2 files changed, 43 insertions(+)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> b/drivers/media/platform/rcar-vin/rcar-v4l2.c index 62ca7e3..f679182 100644
> --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> @@ -557,6 +557,38 @@ static int rvin_dv_timings_cap(struct file *file, void
> *priv_fh, return ret;
>  }
> 
> +static int rvin_g_edid(struct file *file, void *fh, struct v4l2_edid *edid)
> +{
> +	struct rvin_dev *vin = video_drvdata(file);
> +	struct v4l2_subdev *sd = vin_to_source(vin);
> +	int input, ret;
> +
> +	input = edid->pad;
> +	edid->pad = vin->sink_pad_idx;
> +
> +	ret = v4l2_subdev_call(sd, pad, get_edid, edid);
> +
> +	edid->pad = input;
> +
> +	return ret;
> +}
> +
> +static int rvin_s_edid(struct file *file, void *fh, struct v4l2_edid *edid)
> +{
> +	struct rvin_dev *vin = video_drvdata(file);
> +	struct v4l2_subdev *sd = vin_to_source(vin);
> +	int input, ret;
> +
> +	input = edid->pad;
> +	edid->pad = vin->sink_pad_idx;
> +
> +	ret = v4l2_subdev_call(sd, pad, set_edid, edid);
> +
> +	edid->pad = input;
> +
> +	return ret;
> +}
> +
>  static const struct v4l2_ioctl_ops rvin_ioctl_ops = {
>  	.vidioc_querycap		= rvin_querycap,
>  	.vidioc_try_fmt_vid_cap		= rvin_try_fmt_vid_cap,
> @@ -579,6 +611,9 @@ static const struct v4l2_ioctl_ops rvin_ioctl_ops = {
>  	.vidioc_s_dv_timings		= rvin_s_dv_timings,
>  	.vidioc_query_dv_timings	= rvin_query_dv_timings,
> 
> +	.vidioc_g_edid			= rvin_g_edid,
> +	.vidioc_s_edid			= rvin_s_edid,
> +
>  	.vidioc_querystd		= rvin_querystd,
>  	.vidioc_g_std			= rvin_g_std,
>  	.vidioc_s_std			= rvin_s_std,
> @@ -832,6 +867,13 @@ int rvin_v4l2_probe(struct rvin_dev *vin)
>  	vin->src_pad_idx = pad_idx;
>  	fmt.pad = vin->src_pad_idx;
> 
> +	vin->sink_pad_idx = 0;
> +	for (pad_idx = 0; pad_idx < sd->entity.num_pads; pad_idx++)
> +		if (sd->entity.pads[pad_idx].flags == MEDIA_PAD_FL_SINK) {
> +			vin->sink_pad_idx = pad_idx;
> +			break;
> +		}
> +

What if the subdev has multiple sink pads ? Shouldn't the pad number be 
instead computed in the get and set EDID handlers based on the input number 
passed in the struct v4l2_edid::pad field ?

>  	/* Try to improve our guess of a reasonable window format */
>  	ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
>  	if (ret) {
> diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h
> b/drivers/media/platform/rcar-vin/rcar-vin.h index 793184d..af815cc 100644
> --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> @@ -121,6 +121,7 @@ struct rvin_dev {
>  	struct video_device vdev;
>  	struct v4l2_device v4l2_dev;
>  	int src_pad_idx;
> +	int sink_pad_idx;
>  	struct v4l2_ctrl_handler ctrl_handler;
>  	struct v4l2_async_notifier notifier;
>  	struct rvin_graph_entity digital;

-- 
Regards,

Laurent Pinchart