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drm/edid: abstract cea data block collection size

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Add a function to get the cea data block collection size.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/5339ab3249400a3c41001967e7ff2611b58e0425.1654674560.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula
2022-06-08 10:50:32 +03:00
parent fc67615f4e
commit 11a8d095d8
1 changed files with 21 additions and 3 deletions
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24
drivers/gpu/drm/drm_edid.c
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@@ -4482,6 +4482,20 @@ __cea_db_iter_current_block(const struct cea_db_iter *iter)
return NULL;
}
/*
* References:
* - CTA-861-H section 7.3.3 CTA Extension Version 3
*/
static int cea_db_collection_size(const u8 *cta)
{
u8 d = cta[2];
if (d < 4 || d > 127)
return 0;
return d - 4;
}
/*
* References:
* - VESA E-EDID v1.4
@@ -4492,15 +4506,19 @@ static const void *__cea_db_iter_edid_next(struct cea_db_iter *iter)
const u8 *ext;
drm_edid_iter_for_each(ext, &iter->edid_iter) {
int size;
/* Only support CTA Extension revision 3+ */
if (ext[0] != CEA_EXT || cea_revision(ext) < 3)
continue;
iter->index = 4;
iter->end = ext[2];
if (iter->end < 4 || iter->end > 127)
size = cea_db_collection_size(ext);
if (!size)
continue;
iter->index = 4;
iter->end = iter->index + size;
return ext;
}