[Nouveau] [PATCH 3/3] drm/nv50: wait for pgraph to idle before unloading the context

[Maarten Maathuis]

- This should fix the problem with gpu hangs people have had when closing
channels.

Signed-off-by: Maarten Maathuis <madman2003 at gmail.com>
---
 drivers/gpu/drm/nouveau/nv50_graph.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nv50_graph.c b/drivers/gpu/drm/nouveau/nv50_graph.c
index 444a46b..d6897cf 100644
--- a/drivers/gpu/drm/nouveau/nv50_graph.c
+++ b/drivers/gpu/drm/nouveau/nv50_graph.c
@@ -282,6 +282,7 @@ nv50_graph_unload_context(struct drm_device *dev)
 		return 0;
 	inst &= NV50_PGRAPH_CTXCTL_CUR_INSTANCE;
 
+	nouveau_wait_for_idle(dev);
 	nv_wr32(dev, 0x400500, fifo & ~1);
 	nv_wr32(dev, 0x400784, inst);
 	nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) | 0x20);
-- 
1.6.6