drm/nouveau/gr/gf100-gk208: copy big page size setting from fb

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

drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c

@@ -1909,7 +1909,7 @@ gf100_gr_init_gpc_mmu(struct gf100_gr *gr)
 	struct nvkm_device *device = gr->base.engine.subdev.device;
 	struct nvkm_fb *fb = device->fb;
 
-	nvkm_wr32(device, 0x418880, 0x00000000);
+	nvkm_wr32(device, 0x418880, nvkm_rd32(device, 0x100c80) & 0x00000001);
 	nvkm_wr32(device, 0x4188a4, 0x00000000);
 	nvkm_wr32(device, 0x418888, 0x00000000);
 	nvkm_wr32(device, 0x41888c, 0x00000000);