On Tue, Jan 6, 2015 at 2:08 PM, Mauro Carvalho Chehab
wrote:
> The tuner->decoder needs to be enabled when we're about to
> start streaming.
>
> Signed-off-by: Mauro Carvalho Chehab
>
> 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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