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authorHans Verkuil <hans.verkuil@cisco.com>2013-05-29 15:19:05 +0200
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-06-17 14:45:56 +0200
commitf41c4332cfeae59e78aeda6c4eb9d0f4d42adbf2 (patch)
tree7c8b585b329f6d02bcaf1ffa5f154226857e3824 /Documentation
parent[media] v4l2-ioctl: clarify querystd comment (diff)
downloadlinux-f41c4332cfeae59e78aeda6c4eb9d0f4d42adbf2.tar.xz
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[media] DocBook/media/v4l: clarify the QUERYSTD documentation
Explicitly mention that this ioctl should return V4L2_STD_UNKNOWN if not signal was detected. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-querystd.xml3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-querystd.xml b/Documentation/DocBook/media/v4l/vidioc-querystd.xml
index fe80a183d957..222348542182 100644
--- a/Documentation/DocBook/media/v4l/vidioc-querystd.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-querystd.xml
@@ -54,7 +54,8 @@ standard automatically. To do so, applications call <constant>
VIDIOC_QUERYSTD</constant> with a pointer to a &v4l2-std-id; type. The
driver stores here a set of candidates, this can be a single flag or a
set of supported standards if for example the hardware can only
-distinguish between 50 and 60 Hz systems. When detection is not
+distinguish between 50 and 60 Hz systems. If no signal was detected,
+then the driver will return V4L2_STD_UNKNOWN. When detection is not
possible or fails, the set must contain all standards supported by the
current video input or output.</para>