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drm/edid: Add a FIXME about DispID CEA data block revision

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I don't understand what the DispID CEA data block revision
means. The spec doesn't say. I guess some DispID must have
a value of >= 3 in there or else we generally wouldn't
even parse the CEA data blocks. Or does all this code
actually not do anything?

Cc: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200124200231.10517-6-ville.syrjala@linux.intel.com
Reviewed-by: Andres Rodriguez <andresx7@gmail.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
This commit is contained in:
Ville Syrjälä 2020-01-24 22:02:29 +02:00
parent 6e8a942b9d
commit 5036c0d0f2
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/drm_edid.c
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@ -3993,6 +3993,13 @@ cea_db_tag(const u8 *db)
static int
cea_revision(const u8 *cea)
{
/*
* FIXME is this correct for the DispID variant?
* The DispID spec doesn't really specify whether
* this is the revision of the CEA extension or
* the DispID CEA data block. And the only value
* given as an example is 0.
*/
return cea[1];
}