drm/edid: fixup detailed timings like the X server.

this syncs the versioning check with the code the X server uses.
Reported-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_edid.c

@@ -502,25 +502,9 @@ static int add_detailed_info(struct drm_connector *connector,
 		struct detailed_non_pixel *data = &timing->data.other_data;
 		struct drm_display_mode *newmode;
 
-		/* EDID up to and including 1.2 may put monitor info here */
-		if (edid->version == 1 && edid->revision < 3)
-			continue;
-
-		/* Detailed mode timing */
-		if (timing->pixel_clock) {
-			newmode = drm_mode_detailed(dev, edid, timing, quirks);
-			if (!newmode)
-				continue;
-
-			/* First detailed mode is preferred */
-			if (i == 0 && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING))
-				newmode->type |= DRM_MODE_TYPE_PREFERRED;
-			drm_mode_probed_add(connector, newmode);
-
-			modes++;
-			continue;
-		}
-
+		/* X server check is version 1.1 or higher */
+		if (edid->version == 1 && edid->revision >= 1 &&
+		    !timing->pixel_clock) {
 			/* Other timing or info */
 			switch (data->type) {
 			case EDID_DETAIL_MONITOR_SERIAL:
@@ -551,6 +535,18 @@ static int add_detailed_info(struct drm_connector *connector,
 			default:
 				break;
 			}
+		} else {
+			newmode = drm_mode_detailed(dev, edid, timing, quirks);
+			if (!newmode)
+				continue;
+
+			/* First detailed mode is preferred */
+			if (i == 0 && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING))
+				newmode->type |= DRM_MODE_TYPE_PREFERRED;
+			drm_mode_probed_add(connector, newmode);
+
+			modes++;
+		}
 	}
 
 	return modes;