On Thu, May 05, 2022 at 01:52:42PM +0300, Jani Nikula wrote:

Convert drm_find_cea_extension() to EDID block iterator in color format and CTA revision detection. Detect them in all CTA extensions.

Also parse CTA Data Blocks in DisplayID even if there's no CTA EDID extension.

v2:

• Don't assume DRM_COLOR_FORMAT_RGB444 support if there's only DisplayID CTA Data Blocks (Ville)

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

---

drivers/gpu/drm/drm_edid.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 3b18a6e501df..8d737322145c 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -5447,26 +5447,31 @@ static void drm_parse_cea_ext(struct drm_connector *connector, const struct edid *edid) { struct drm_display_info *info = &connector->display_info;

• struct drm_edid_iter edid_iter; const struct cea_db *db; struct cea_db_iter iter; const u8 *edid_ext;

• edid_ext = drm_find_cea_extension(edid);
• if (!edid_ext)

• return;
  

• drm_edid_iter_begin(edid, &edid_iter);
• drm_edid_iter_for_each(edid_ext, &edid_iter) {

• if (edid_ext[0] != CEA_EXT)
  

• 	continue;
  
  

• info->cea_rev = edid_ext[1];

• if (!info->cea_rev)
  

• 	info->cea_rev = edid_ext[1];
  
  

• /* The existence of a CEA block should imply RGB support */
• info->color_formats = DRM_COLOR_FORMAT_RGB444;

• if (info->cea_rev != edid_ext[1])
  

• 	DRM_DEBUG_KMS("CEA extension version mismatch %u != %u\n",
  

• 		      info->cea_rev, edid_ext[1]);
  
  

• /* CTA DisplayID Data Block does not have byte #3 */
• if (edid_ext[0] == CEA_EXT) {

• /* The existence of a CTA extension 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; }

• drm_edid_iter_end(&edid_iter);

  cea_db_iter_edid_begin(edid, &iter); cea_db_iter_for_each(db, &iter) {

-- 2.30.2