The field order must match between the source and sink pads, or the sink
pad field order must be NONE. This allows connecting an interlaced
source to a bridge that has no hardware support for interlaced formats.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-subdev.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 058c1a6..752cca0 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -468,11 +468,20 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
struct v4l2_subdev_format *source_fmt,
struct v4l2_subdev_format *sink_fmt)
{
+ /* The width, height and code must match. */
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;
+ /* The field order must match, or the sink field order must be NONE
+ * to support interlaced hardware connected to bridges that support
+ * progressive formats only.
+ */
+ if (source_fmt->format.field != sink_fmt->format.field &&
+ sink_fmt->format.field != V4L2_FIELD_NONE)
+ return -EINVAL;
+
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
--
1.8.5.5
--
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