drm/edid: parse display info has_audio similar to is_hdmi

Since we already iterate everything that's needed for determining audio,
reduce the need to call drm_detect_monitor_audio() by storing has_audio
to connector info.
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/391a93b25c6bcbb39854aaa2813570cfb1580ed9.1685437500.git.jani.nikula@intel.com

drivers/gpu/drm/drm_edid.c

@@ -6243,6 +6243,9 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
 			info->color_formats |= DRM_COLOR_FORMAT_YCBCR444;
 		if (edid_ext[3] & EDID_CEA_YCRCB422)
 			info->color_formats |= DRM_COLOR_FORMAT_YCBCR422;
+		if (edid_ext[3] & EDID_BASIC_AUDIO)
+			info->has_audio = true;
+
 	}
 	drm_edid_iter_end(&edid_iter);
 
@@ -6268,6 +6271,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
 			drm_parse_hdr_metadata_block(connector, data);
 		else if (cea_db_tag(db) == CTA_DB_VIDEO)
 			parse_cta_vdb(connector, db);
+		else if (cea_db_tag(db) == CTA_DB_AUDIO)
+			info->has_audio = true;
 	}
 	cea_db_iter_end(&iter);
 
@@ -6424,6 +6429,7 @@ static void drm_reset_display_info(struct drm_connector *connector)
 	info->max_tmds_clock = 0;
 	info->dvi_dual = false;
 	info->is_hdmi = false;
+	info->has_audio = false;
 	info->has_hdmi_infoframe = false;
 	info->rgb_quant_range_selectable = false;
 	memset(&info->hdmi, 0, sizeof(info->hdmi));

include/drm/drm_connector.h

@@ -658,6 +658,14 @@ struct drm_display_info {
 	 */
 	bool is_hdmi;
 
+	/**
+	 * @has_audio: True if the sink supports audio.
+	 *
+	 * This field shall be used instead of calling
+	 * drm_detect_monitor_audio() when possible.
+	 */
+	bool has_audio;
+
 	/**
 	 * @has_hdmi_infoframe: Does the sink support the HDMI infoframe?
 	 */