These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / Documentation / DocBook / media / v4l / vidioc-g-edid.xml

diff --git a/kernel/Documentation/DocBook/media/v4l/vidioc-g-edid.xml b/kernel/Documentation/DocBook/media/v4l/vidioc-g-edid.xml
index 6df40db..2702536 100644 (file)
--- a/kernel/Documentation/DocBook/media/v4l/vidioc-g-edid.xml
+++ b/kernel/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,