drm/nouveau: replace nv04_graph_fifo_access() use with direct reg bashing

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv10_graph.c b/drivers/gpu/drm/nouveau/nv10_graph.c
index 0930c6c..2567522 100644
--- a/drivers/gpu/drm/nouveau/nv10_graph.c
+++ b/drivers/gpu/drm/nouveau/nv10_graph.c
@@ -708,8 +708,8 @@
 		0x2c000000 | chan->id << 20 | subchan << 16 | 0x18c);
 	nv_wr32(dev, NV10_PGRAPH_FFINTFC_ST2_DL, inst);
 	nv_mask(dev, NV10_PGRAPH_CTX_CONTROL, 0, 0x10000);
-	nv04_graph_fifo_access(dev, true);
-	nv04_graph_fifo_access(dev, false);
+	nv_mask(dev, NV04_PGRAPH_FIFO, 0x00000001, 0x00000001);
+	nv_mask(dev, NV04_PGRAPH_FIFO, 0x00000001, 0x00000000);
 
 	/* Restore the FIFO state */
 	for (i = 0; i < ARRAY_SIZE(fifo); i++)
@@ -879,13 +879,13 @@
 	unsigned long flags;
 
 	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
-	nv04_graph_fifo_access(dev, false);
+	nv_mask(dev, NV04_PGRAPH_FIFO, 0x00000001, 0x00000000);
 
 	/* Unload the context if it's the currently active one */
 	if (nv10_graph_channel(dev) == chan)
 		nv10_graph_unload_context(dev);
 
-	nv04_graph_fifo_access(dev, true);
+	nv_mask(dev, NV04_PGRAPH_FIFO, 0x00000001, 0x00000001);
 	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 
 	/* Free the context resources */