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[media] vidioc-g-edid.xml: be explicit about zeroing the reserved array 

The G/S_EDID documentation did not explicitly state that the reserved array
should be zeroed by the application.

Also add the missing VIDIOC_SUBDEV_G/S_EDID ioctl names to the header.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2016-03-22 07:30:27 -03:00 committed by Mauro Carvalho Chehab
parent 7277772488
commit 0be67c40d4
1 changed files with 6 additions and 4 deletions
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10
Documentation/DocBook/media/v4l/vidioc-g-edid.xml
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@ -1,6 +1,6 @@
<refentry id="vidioc-g-edid">
<refmeta>
<refentrytitle>ioctl VIDIOC_G_EDID, VIDIOC_S_EDID</refentrytitle>
<refentrytitle>ioctl VIDIOC_G_EDID, VIDIOC_S_EDID, VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_S_EDID</refentrytitle>
&manvol;
</refmeta>
@ -71,7 +71,8 @@
<para>To get the EDID data the application has to fill in the <structfield>pad</structfield>,
<structfield>start_block</structfield>, <structfield>blocks</structfield> and <structfield>edid</structfield>
fields and call <constant>VIDIOC_G_EDID</constant>. The current EDID from block
fields, zero the <structfield>reserved</structfield> array and call
<constant>VIDIOC_G_EDID</constant>. The current EDID from block
<structfield>start_block</structfield> and of size <structfield>blocks</structfield>
will be placed in the memory <structfield>edid</structfield> points to. The <structfield>edid</structfield>
pointer must point to memory at least <structfield>blocks</structfield>&nbsp;*&nbsp;128 bytes
@ -92,8 +93,9 @@
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,
<structfield>blocks</structfield> and <structfield>edid</structfield> fields, set
<structfield>start_block</structfield> to 0 and zero the <structfield>reserved</structfield> array.
It is not possible to set part of an EDID,
it is always all or nothing. Setting the EDID data is only valid for receivers as it makes
no sense for a transmitter.</para>