diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2022-03-23 12:04:38 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2022-03-24 11:41:14 +0200 |
| commit | 7344bad7fb6daa4877a1c064b52c7d5f9182c41b (patch) | |
| tree | af92a0132abe4568b16b9e529317cb6bd17cfdf1 | |
| parent | 5662abf6e21338be6d085d6375d3732ac6147fd2 (diff) | |
| download | ci-7344bad7fb6daa4877a1c064b52c7d5f9182c41b.tar.gz | |
drm/edid: fix CEA extension byte #3 parsing
Only an EDID CEA extension has byte #3, while the CTA DisplayID Data
Block does not. Don't interpret bogus data for color formats.
For most displays it's probably an unlikely scenario you'd have a CTA
DisplayID Data Block without a CEA extension, but they do exist.
Fixes: e28ad544f462 ("drm/edid: parse CEA blocks embedded in DisplayID")
Cc: <stable@vger.kernel.org>
Cc: Shawn C Lee <shawn.c.lee@intel.com>
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/20220323100438.1757295-1-jani.nikula@intel.com
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index f07af6786cec6..cc7bd58369dfe 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -5188,10 +5188,14 @@ static void drm_parse_cea_ext(struct drm_connector *connector, /* The existence of a CEA block should imply RGB support */ info->color_formats = DRM_COLOR_FORMAT_RGB444; - if (edid_ext[3] & EDID_CEA_YCRCB444) - info->color_formats |= DRM_COLOR_FORMAT_YCBCR444; - if (edid_ext[3] & EDID_CEA_YCRCB422) - info->color_formats |= DRM_COLOR_FORMAT_YCBCR422; + + /* CTA DisplayID Data Block does not have byte #3 */ + if (edid_ext[0] == CEA_EXT) { + if (edid_ext[3] & EDID_CEA_YCRCB444) + info->color_formats |= DRM_COLOR_FORMAT_YCBCR444; + if (edid_ext[3] & EDID_CEA_YCRCB422) + info->color_formats |= DRM_COLOR_FORMAT_YCBCR422; + } if (cea_db_offsets(edid_ext, &start, &end)) return; |