drm/edid: convert drm_detect_hdmi_monitor() to use cea db iter

Iterate through all CTA data blocks, not just the first CTA extension.

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/b867e7b628189d2f8fa7eac5b9aa701892724711.1651569697.git.jani.nikula@intel.com

drivers/gpu/drm/drm_edid.c

@@ -5131,27 +5131,24 @@ EXPORT_SYMBOL(drm_av_sync_delay);
  */
 bool drm_detect_hdmi_monitor(const struct edid *edid)
 {
-	const u8 *edid_ext;
-	int i;
-	int start_offset, end_offset;
-
-	edid_ext = drm_find_cea_extension(edid);
-	if (!edid_ext)
-		return false;
-
-	if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
-		return false;
+	const struct cea_db *db;
+	struct cea_db_iter iter;
+	bool hdmi = false;
 
 	/*
 	 * Because HDMI identifier is in Vendor Specific Block,
 	 * search it from all data blocks of CEA extension.
 	 */
-	for_each_cea_db(edid_ext, i, start_offset, end_offset) {
-		if (cea_db_is_hdmi_vsdb(&edid_ext[i]))
-			return true;
+	cea_db_iter_edid_begin(edid, &iter);
+	cea_db_iter_for_each(db, &iter) {
+		if (cea_db_is_hdmi_vsdb(db)) {
+			hdmi = true;
+			break;
+		}
 	}
+	cea_db_iter_end(&iter);
 
-	return false;
+	return hdmi;
 }
 EXPORT_SYMBOL(drm_detect_hdmi_monitor);