drm/nouveau/ttm: untangle code to support accelerated buffer moves

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv50_fbcon.c b/drivers/gpu/drm/nouveau/nv50_fbcon.c
index 61747e0..e3c8b05 100644
--- a/drivers/gpu/drm/nouveau/nv50_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nv50_fbcon.c
@@ -201,8 +201,7 @@
 
 	BEGIN_NV04(chan, NvSub2D, 0x0000, 1);
 	OUT_RING(chan, Nv2D);
-	BEGIN_NV04(chan, NvSub2D, 0x0180, 4);
-	OUT_RING(chan, NvNotify0);
+	BEGIN_NV04(chan, NvSub2D, 0x0184, 3);
 	OUT_RING(chan, chan->vram_handle);
 	OUT_RING(chan, chan->vram_handle);
 	OUT_RING(chan, chan->vram_handle);