From 25856c0b04fd9ea616acaf3318d0db1cd70bb00a Mon Sep 17 00:00:00 2001
From: Alexandre Courbot <acourbot@nvidia.com>
Date: Tue, 15 Jul 2014 10:36:11 +0900
Subject: [PATCH] drm/nve4/graph: do not crash if no power device present

Detect and workaround the absence of a power device so chips that do not
feature one (e.g. GK20A) can still use this driver.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---
 drivers/gpu/drm/nouveau/core/engine/graph/nve4.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c b/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c
index 1ba6666da4e56..fb9cb929320dd 100644
--- a/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c
+++ b/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c
@@ -203,7 +203,8 @@ nve4_graph_init(struct nouveau_object *object)
 	int gpc, tpc, rop;
 	int ret, i;
 
-	ppwr->pgob(ppwr, false);
+	if (ppwr)
+		ppwr->pgob(ppwr, false);
 
 	ret = nouveau_graph_init(&priv->base);
 	if (ret)
-- 
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