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-rw-r--r--Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml14
1 files changed, 12 insertions, 2 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml b/Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml
index e9c70a8f3..0c93677d1 100644
--- a/Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml
@@ -60,9 +60,19 @@ input</refpurpose>
automatically, similar to sensing the video standard. To do so, applications
call <constant>VIDIOC_QUERY_DV_TIMINGS</constant> with a pointer to a
&v4l2-dv-timings;. Once the hardware detects the timings, it will fill in the
-timings structure.
+timings structure.</para>
-If the timings could not be detected because there was no signal, then
+<para>Please note that drivers shall <emphasis>not</emphasis> switch timings automatically
+if new timings are detected. Instead, drivers should send the
+<constant>V4L2_EVENT_SOURCE_CHANGE</constant> event (if they support this) and expect
+that userspace will take action by calling <constant>VIDIOC_QUERY_DV_TIMINGS</constant>.
+The reason is that new timings usually mean different buffer sizes as well, and you
+cannot change buffer sizes on the fly. In general, applications that receive the
+Source Change event will have to call <constant>VIDIOC_QUERY_DV_TIMINGS</constant>,
+and if the detected timings are valid they will have to stop streaming, set the new
+timings, allocate new buffers and start streaming again.</para>
+
+<para>If the timings could not be detected because there was no signal, then
<errorcode>ENOLINK</errorcode> is returned. If a signal was detected, but
it was unstable and the receiver could not lock to the signal, then
<errorcode>ENOLCK</errorcode> is returned. If the receiver could lock to the signal,