drm/nouveau/gr/gm204: initial init+ctx code

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c
index b66b1c6..298a33c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/gm100.c
@@ -129,9 +129,7 @@
 		device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 		device->oclass[NVDEV_ENGINE_FIFO   ] =  gm204_fifo_oclass;
 		device->oclass[NVDEV_ENGINE_SW     ] =  gf100_sw_oclass;
-#if 0
-		device->oclass[NVDEV_ENGINE_GR     ] =  gm107_gr_oclass;
-#endif
+		device->oclass[NVDEV_ENGINE_GR     ] =  gm204_gr_oclass;
 		device->oclass[NVDEV_ENGINE_DISP   ] =  gm204_disp_oclass;
 		device->oclass[NVDEV_ENGINE_CE0    ] = &gm204_ce0_oclass;
 		device->oclass[NVDEV_ENGINE_CE1    ] = &gm204_ce1_oclass;