linux-kernel - Re: [PATCH v4 09/21] media: camss: Add files which handle the video device nodes

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Date:   Tue, 8 Aug 2017 17:44:31 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Todor Tomov <todor.tomov@...aro.org>
Cc:     mchehab@...nel.org, hans.verkuil@...co.com, s.nawrocki@...sung.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v4 09/21] media: camss: Add files which handle the video
 device nodes

Hi Todor,

On Tue, Aug 08, 2017 at 04:30:06PM +0300, Todor Tomov wrote:
...
> +static int video_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> +	struct camss_video *video = vb2_get_drv_priv(q);
> +	struct video_device *vdev = &video->vdev;
> +	struct media_entity *entity;
> +	struct media_pad *pad;
> +	struct v4l2_subdev *subdev;
> +	int ret;
> +
> +	ret = media_pipeline_start(&vdev->entity, &video->pipe);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = video_check_format(video);
> +	if (ret < 0)
> +		goto error;
> +
> +	entity = &vdev->entity;
> +	while (1) {
> +		pad = &entity->pads[0];
> +		if (!(pad->flags & MEDIA_PAD_FL_SINK))
> +			break;

Could you align starting and stopping the streaming with this patch:

<URL:http://www.spinics.net/lists/linux-media/msg117737.html>

I'll send a pull request on it shortly.

Feel free to postpone for now, this isn't urgent.

> +
> +		pad = media_entity_remote_pad(pad);
> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> +			break;
> +
> +		entity = pad->entity;
> +		subdev = media_entity_to_v4l2_subdev(entity);
> +
> +		ret = v4l2_subdev_call(subdev, video, s_stream, 1);
> +		if (ret < 0 && ret != -ENOIOCTLCMD)
> +			goto error;
> +	}
> +
> +	return 0;
> +
> +error:
> +	media_pipeline_stop(&vdev->entity);
> +
> +	video->ops->flush_buffers(video, VB2_BUF_STATE_QUEUED);
> +
> +	return ret;
> +}
> +
> +static void video_stop_streaming(struct vb2_queue *q)
> +{
> +	struct camss_video *video = vb2_get_drv_priv(q);
> +	struct video_device *vdev = &video->vdev;
> +	struct media_entity *entity;
> +	struct media_pad *pad;
> +	struct v4l2_subdev *subdev;
> +	struct v4l2_subdev *subdev_vfe = NULL;
> +
> +	entity = &vdev->entity;
> +	while (1) {
> +		pad = &entity->pads[0];
> +		if (!(pad->flags & MEDIA_PAD_FL_SINK))
> +			break;
> +
> +		pad = media_entity_remote_pad(pad);
> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> +			break;
> +
> +		entity = pad->entity;
> +		subdev = media_entity_to_v4l2_subdev(entity);
> +
> +		if (strstr(subdev->name, "vfe")) {
> +			subdev_vfe = subdev;
> +		} else if (strstr(subdev->name, "ispif")) {
> +			v4l2_subdev_call(subdev, video, s_stream, 0);
> +			v4l2_subdev_call(subdev_vfe, video, s_stream, 0);
> +		} else {
> +			v4l2_subdev_call(subdev, video, s_stream, 0);
> +		}
> +	}
> +
> +	media_pipeline_stop(&vdev->entity);
> +
> +	video->ops->flush_buffers(video, VB2_BUF_STATE_ERROR);
> +}

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk