drm/nouveau/disp/nv04: implement a base display object class

Will be used for upcoming vblank event interfaces.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nv04_display.c

@@ -22,6 +22,9 @@
  * Author: Ben Skeggs
  */
 
+#include <core/object.h>
+#include <core/class.h>
+
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 
@@ -71,6 +74,11 @@ nv04_display_create(struct drm_device *dev)
 
 	nouveau_hw_save_vga_fonts(dev, 1);
 
+	ret = nouveau_object_new(nv_object(drm), NVDRM_DEVICE, 0xd1500000,
+				 NV04_DISP_CLASS, NULL, 0, &disp->core);
+	if (ret)
+		return ret;
+
 	nv04_crtc_create(dev, 0);
 	if (nv_two_heads(dev))
 		nv04_crtc_create(dev, 1);