Re: [PATCHv3 18/20] cx231xx: enable tuner->decoder link at videobuf start

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On Tue, Jan 6, 2015 at 2:08 PM, Mauro Carvalho Chehab
<mchehab@xxxxxxxxxxxxxxx> wrote:
> The tuner->decoder needs to be enabled when we're about to
> start streaming.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
>
> diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
> index f3d1a488dfa7..634763535d60 100644
> --- a/drivers/media/usb/cx231xx/cx231xx-video.c
> +++ b/drivers/media/usb/cx231xx/cx231xx-video.c
> @@ -703,6 +703,74 @@ static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
>         buf->vb.state = VIDEOBUF_NEEDS_INIT;
>  }
>
> +static int cx231xx_enable_analog_tuner(struct cx231xx *dev)
> +{
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +       struct media_device *mdev = dev->media_dev;
> +       struct media_entity  *entity, *decoder = NULL, *source;
> +       struct media_link *link, *found_link = NULL;
> +       int i, ret, active_links = 0;
> +
> +       if (!mdev)
> +               return 0;
> +
> +/*
> + * This will find the tuner that it is connected into the decoder.
> + * Technically, this is not 100% correct, as the device may be using an
> + * analog input instead of the tuner. However, we can't use the DVB for dvb
> + * while the DMA engine is being used for V4L2.
> + */
> +       media_device_for_each_entity(entity, mdev) {
> +               if (entity->type == MEDIA_ENT_T_V4L2_SUBDEV_DECODER) {
> +                       decoder = entity;
> +                       break;
> +               }
> +       }
> +       if (!decoder)
> +               return 0;
> +
> +       for (i = 0; i < decoder->num_links; i++) {
> +               link = &decoder->links[i];
> +               if (link->sink->entity == decoder) {
> +                       found_link = link;
> +                       if (link->flags & MEDIA_LNK_FL_ENABLED)
> +                               active_links++;
> +                       break;
> +               }
> +       }

Does this code path need to be protected?

> +
> +       if (active_links == 1 || !found_link)
> +               return 0;
> +
> +       source = found_link->source->entity;
> +       for (i = 0; i < source->num_links; i++) {
> +               struct media_entity *sink;
> +               int flags = 0;
> +
> +               link = &source->links[i];
> +               sink = link->sink->entity;
> +
> +               if (sink == entity)
> +                       flags = MEDIA_LNK_FL_ENABLED;
> +
> +               ret = media_entity_setup_link(link, flags);
> +               if (ret) {
> +                       dev_err(dev->dev,
> +                               "Couldn't change link %s->%s to %s. Error %d\n",
> +                               source->name, sink->name,
> +                               flags ? "enabled" : "disabled",
> +                               ret);
> +                       return ret;
> +               } else
> +                       dev_dbg(dev->dev,
> +                               "link %s->%s was %s\n",
> +                               source->name, sink->name,
> +                               flags ? "ENABLED" : "disabled");
> +       }
> +#endif
> +       return 0;
> +}
> +
>  static int
>  buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
>                enum v4l2_field field)
> @@ -756,6 +824,9 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
>         }
>
>         buf->vb.state = VIDEOBUF_PREPARED;
> +
> +       cx231xx_enable_analog_tuner(dev);
> +
>         return 0;
>
>  fail:
> --
> 2.1.0
>
> --
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