diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2022-06-08 10:50:32 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2022-06-13 12:30:34 +0300 |
| commit | 11a8d095d86854bbc8697525f2c543de36bf5804 (patch) | |
| tree | bd75803dcafcbe67bd747e5315d40487b0a699cc /drivers/gpu | |
| parent | fc67615f4ecc3b66bd458840927272aa131eface (diff) | |
| download | linux-11a8d095d86854bbc8697525f2c543de36bf5804.tar.xz | |
drm/edid: abstract cea data block collection size
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
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index c57f6333ea7d..002816509fc8 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4484,6 +4484,20 @@ __cea_db_iter_current_block(const struct cea_db_iter *iter) /* * 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 * - CTA-861-H section 7.3.3 CTA Extension Version 3 */ @@ -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; } |