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[media] media: change pipeline validation return error

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According to the V4L2 API, the VIDIOC_STREAMON ioctl should return EPIPE
if there is a format mismatch in the pipeline configuration.

As the .vidioc_streamon in the v4l2_ioctl_ops usually forwards the error
caused by the v4l2_subdev_link_validate_default (if it is in use), it
should return -EPIPE when it detect the mismatch.

When an entity is connected to a non enabled link,
media_entity_pipeline_start should return -ENOLINK, as the link does not
exist.

Signed-off-by: Helen Mae Koike Fornazier <helen.koike@collabora.co.uk>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Helen Mae Koike Fornazier 2015-06-28 16:14:10 -03:00 committed by Mauro Carvalho Chehab
parent 45c175c4ae
commit 47dfdb3a88
2 changed files with 3 additions and 3 deletions
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2
drivers/media/media-entity.c
View file

@ -445,7 +445,7 @@ __must_check int __media_entity_pipeline_start(struct media_entity *entity,
bitmap_or(active, active, has_no_links, entity->num_pads);
if (!bitmap_full(active, entity->num_pads)) {
ret = -EPIPE;
ret = -ENOLINK;
dev_dbg(entity->graph_obj.mdev->dev,
"\"%s\":%u must be connected by an enabled link\n",
entity->name,

4
drivers/media/v4l2-core/v4l2-subdev.c
View file

@ -510,7 +510,7 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
if (source_fmt->format.width != sink_fmt->format.width
|| source_fmt->format.height != sink_fmt->format.height
|| source_fmt->format.code != sink_fmt->format.code)
return -EINVAL;
return -EPIPE;
/* The field order must match, or the sink field order must be NONE
* to support interlaced hardware connected to bridges that support
@ -518,7 +518,7 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
*/
if (source_fmt->format.field != sink_fmt->format.field &&
sink_fmt->format.field != V4L2_FIELD_NONE)
return -EINVAL;
return -EPIPE;
return 0;
}