drm/edid: split drm_add_edid_modes() to two

Reduce the size of the function that actually modifies the EDID.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/437c3c79f68d1144444fb2dd18a678f3aa97272c.1648477901.git.jani.nikula@intel.com

drivers/gpu/drm/drm_edid.c

@@ -5556,18 +5556,8 @@ static int add_displayid_detailed_modes(struct drm_connector *connector,
 	return num_modes;
 }
 
-/**
- * drm_add_edid_modes - add modes from EDID data, if available
- * @connector: connector we're probing
- * @edid: EDID data
- *
- * Add the specified modes to the connector's mode list. Also fills out the
- * &drm_display_info structure and ELD in @connector with any information which
- * can be derived from the edid.
- *
- * Return: The number of modes added or 0 if we couldn't find any.
- */
-int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
+static int drm_edid_connector_update(struct drm_connector *connector,
+				     const struct edid *edid)
 {
 	int num_modes = 0;
 	u32 quirks;
@@ -5576,12 +5566,6 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
 		clear_eld(connector);
 		return 0;
 	}
-	if (!drm_edid_is_valid(edid)) {
-		clear_eld(connector);
-		drm_warn(connector->dev, "%s: EDID invalid.\n",
-			 connector->name);
-		return 0;
-	}
 
 	drm_edid_to_eld(connector, edid);
 
@@ -5633,6 +5617,28 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
 
 	return num_modes;
 }
+
+/**
+ * drm_add_edid_modes - add modes from EDID data, if available
+ * @connector: connector we're probing
+ * @edid: EDID data
+ *
+ * Add the specified modes to the connector's mode list. Also fills out the
+ * &drm_display_info structure and ELD in @connector with any information which
+ * can be derived from the edid.
+ *
+ * Return: The number of modes added or 0 if we couldn't find any.
+ */
+int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
+{
+	if (edid && !drm_edid_is_valid(edid)) {
+		drm_warn(connector->dev, "%s: EDID invalid.\n",
+			 connector->name);
+		edid = NULL;
+	}
+
+	return drm_edid_connector_update(connector, edid);
+}
 EXPORT_SYMBOL(drm_add_edid_modes);
 
 /**