drm/edid: Reduce the number of times we parse the CEA extension block

Instead of parsing parts of the CEA extension block in two places
to determine supported color formats and whatnot, let's just
consolidate it to one function. This also makes it possible to neatly
flatten drm_assign_hdmi_deep_color_info().
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1475070703-6435-7-git-send-email-ville.syrjala@linux.intel.com

drivers/gpu/drm/drm_edid.c

@@ -3733,38 +3733,17 @@ bool drm_rgb_quant_range_selectable(struct edid *edid)
 }
 EXPORT_SYMBOL(drm_rgb_quant_range_selectable);
 
-/*
- * Parse the CEA extension according to CEA-861-B.
- * Return true if HDMI deep color supported, false if not or unknown.
- */
-static bool drm_assign_hdmi_deep_color_info(struct edid *edid,
-                                            struct drm_connector *connector)
+static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
+					   const u8 *hdmi)
 {
 	struct drm_display_info *info = &connector->display_info;
-	u8 *edid_ext, *hdmi;
-	int i;
-	int start_offset, end_offset;
 	unsigned int dc_bpc = 0;
 
-	edid_ext = drm_find_cea_extension(edid);
-	if (!edid_ext)
-		return false;
-
-	if (cea_db_offsets(edid_ext, &start_offset, &end_offset))
-		return 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])) {
 	/* HDMI supports at least 8 bpc */
 	info->bpc = 8;
 
-			hdmi = &edid_ext[i];
 	if (cea_db_payload_len(hdmi) < 6)
-				return false;
+		return;
 
 	if (hdmi[6] & DRM_EDID_HDMI_DC_30) {
 		dc_bpc = 10;
@@ -3787,7 +3766,12 @@ static bool drm_assign_hdmi_deep_color_info(struct edid *edid,
 			  connector->name);
 	}
 
-			if (dc_bpc > 0) {
+	if (dc_bpc == 0) {
+		DRM_DEBUG("%s: No deep color support on this HDMI sink.\n",
+			  connector->name);
+		return;
+	}
+
 	DRM_DEBUG("%s: Assigning HDMI sink color depth as %d bpc.\n",
 		  connector->name, dc_bpc);
 	info->bpc = dc_bpc;
@@ -3814,24 +3798,45 @@ static bool drm_assign_hdmi_deep_color_info(struct edid *edid,
 		DRM_DEBUG("%s: HDMI sink should do DC_36, but does not!\n",
 			  connector->name);
 	}
+}
 
-				return true;
-			}
-			else {
-				DRM_DEBUG("%s: No deep color support on this HDMI sink.\n",
-						  connector->name);
-			}
-		}
-	}
+static void drm_parse_cea_ext(struct drm_connector *connector,
+			      struct edid *edid)
+{
+	struct drm_display_info *info = &connector->display_info;
+	const u8 *edid_ext;
+	int i, start, end;
 
-	return false;
+	edid_ext = drm_find_cea_extension(edid);
+	if (!edid_ext)
+		return;
+
+	info->cea_rev = edid_ext[1];
+
+	/* 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_YCRCB444;
+	if (edid_ext[3] & EDID_CEA_YCRCB422)
+		info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
+
+	if (cea_db_offsets(edid_ext, &start, &end))
+		return;
+
+	for_each_cea_db(edid_ext, i, start, end) {
+		const u8 *db = &edid_ext[i];
+
+		if (!cea_db_is_hdmi_vsdb(db))
+			continue;
+
+		drm_parse_hdmi_deep_color_info(connector, db);
+	}
 }
 
-static void drm_add_display_info(struct edid *edid,
-                                 struct drm_connector *connector)
+static void drm_add_display_info(struct drm_connector *connector,
+				 struct edid *edid)
 {
 	struct drm_display_info *info = &connector->display_info;
-	u8 *edid_ext;
 
 	info->width_mm = edid->width_cm * 10;
 	info->height_mm = edid->height_cm * 10;
@@ -3846,21 +3851,7 @@ static void drm_add_display_info(struct edid *edid,
 	if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
 		return;
 
-	/* Get data from CEA blocks if present */
-	edid_ext = drm_find_cea_extension(edid);
-	if (edid_ext) {
-		info->cea_rev = edid_ext[1];
-
-		/* 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_YCRCB444;
-		if (edid_ext[3] & EDID_CEA_YCRCB422)
-			info->color_formats |= DRM_COLOR_FORMAT_YCRCB422;
-	}
-
-	/* HDMI deep color modes supported? Assign to info, if so */
-	drm_assign_hdmi_deep_color_info(edid, connector);
+	drm_parse_cea_ext(connector, edid);
 
 	/*
 	 * Digital sink with "DFP 1.x compliant TMDS" according to EDID 1.3?
@@ -4096,7 +4087,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
 	if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
 		edid_fixup_preferred(connector, quirks);
 
-	drm_add_display_info(edid, connector);
+	drm_add_display_info(connector, edid);
 
 	if (quirks & EDID_QUIRK_FORCE_6BPC)
 		connector->display_info.bpc = 6;