drm: Sort connector modes based on vrefresh

Keeping the modes sorted by vrefresh before the pixel clock makes the
mode list somehow more pleasing to the eye.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc_helper.c

@@ -189,13 +189,14 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 	if (list_empty(&connector->modes))
 		return 0;
 
+	list_for_each_entry(mode, &connector->modes, head)
+		mode->vrefresh = drm_mode_vrefresh(mode);
+
 	drm_mode_sort(&connector->modes);
 
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
 			drm_get_connector_name(connector));
 	list_for_each_entry(mode, &connector->modes, head) {
-		mode->vrefresh = drm_mode_vrefresh(mode);
-
 		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
 		drm_mode_debug_printmodeline(mode);
 	}

drivers/gpu/drm/drm_modes.c

@@ -1020,6 +1020,11 @@ static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head
 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
 	if (diff)
 		return diff;
+
+	diff = b->vrefresh - a->vrefresh;
+	if (diff)
+		return diff;
+
 	diff = b->clock - a->clock;
 	return diff;
 }