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[media] DocBook/media: Improve G_EDID specification

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When using VIDIOC_G_EDID there is a special case where start_blocks and
blocks are both set to 0. In that case the driver just has to set blocks to
the total number of available blocks and return 0.

Even though the drivers do this right and v4l2-compliance tests for it, it
turned out not to be documented in the spec. Fix this.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reported-by: Mats Randgaard <matrandg@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-04-23 03:38:57 -03:00 committed by Mauro Carvalho Chehab
parent e56f8ef05c
commit 45339d5ba8
1 changed files with 7 additions and 0 deletions
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7
Documentation/DocBook/media/v4l/vidioc-g-edid.xml
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@ -82,6 +82,13 @@
<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,