[media] cx231xx: enable the analog tuner at buffer setup

buf_prepare callback is called for every queued buffer. This is
an overkill. Call it at buf_setup, as this should be enough.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
index 86ad746..acc1b68 100644 (file)
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -100,6 +100,75 @@ static struct cx231xx_fmt format[] = {
 };
 
 
+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 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, as we can't
+        * do DVB streaming while the DMA engine is being used for V4L2,
+        * this should be enough for the actual needs.
+        */
+       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;
+               }
+       }
+
+       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;
+}
+
 /* ------------------------------------------------------------------
        Video buffer and parser functions
    ------------------------------------------------------------------*/
@@ -667,6 +736,9 @@ buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
        if (*count < CX231XX_MIN_BUF)
                *count = CX231XX_MIN_BUF;
 
+
+       cx231xx_enable_analog_tuner(dev);
+
        return 0;
 }
 
@@ -703,75 +775,6 @@ 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 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, as we can't
-        * do DVB streaming while the DMA engine is being used for V4L2,
-        * this should be enough for the actual needs.
-        */
-       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;
-               }
-       }
-
-       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)
@@ -826,8 +829,6 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 
        buf->vb.state = VIDEOBUF_PREPARED;
 
-       cx231xx_enable_analog_tuner(dev);
-
        return 0;
 
 fail: