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-rw-r--r--Documentation/DocBook/media/v4l/vidioc-g-edid.xml11
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-edid.xml b/Documentation/DocBook/media/v4l/vidioc-g-edid.xml
index 6df40db4c8ba..2702536bbc7c 100644
--- a/Documentation/DocBook/media/v4l/vidioc-g-edid.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-g-edid.xml
@@ -7,6 +7,8 @@
<refnamediv>
<refname>VIDIOC_G_EDID</refname>
<refname>VIDIOC_S_EDID</refname>
+ <refname>VIDIOC_SUBDEV_G_EDID</refname>
+ <refname>VIDIOC_SUBDEV_S_EDID</refname>
<refpurpose>Get or set the EDID of a video receiver/transmitter</refpurpose>
</refnamediv>
@@ -42,7 +44,7 @@
<varlistentry>
<term><parameter>request</parameter></term>
<listitem>
- <para>VIDIOC_G_EDID, VIDIOC_S_EDID</para>
+ <para>VIDIOC_G_EDID, VIDIOC_S_EDID, VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_S_EDID</para>
</listitem>
</varlistentry>
<varlistentry>
@@ -82,6 +84,13 @@
<para>If blocks have to be retrieved from the sink, then this call will block until they
have been read.</para>
+ <para>If <structfield>start_block</structfield> and <structfield>blocks</structfield> are
+ both set to 0 when <constant>VIDIOC_G_EDID</constant> is called, then the driver will
+ set <structfield>blocks</structfield> to the total number of available EDID blocks
+ and it will return 0 without copying any data. This is an easy way to discover how many
+ EDID blocks there are. Note that if there are no EDID blocks available at all, then
+ the driver will set <structfield>blocks</structfield> to 0 and it returns 0.</para>
+
<para>To set the EDID blocks of a receiver the application has to fill in the <structfield>pad</structfield>,
<structfield>blocks</structfield> and <structfield>edid</structfield> fields and set
<structfield>start_block</structfield> to 0. It is not possible to set part of an EDID,