nvc0_graph_ctor() would only let the graphics engine be enabled if its
oclass has a proper microcode linked to it. This prevents GR from being
enabled at all on chips that rely exclusively on external firmware, even
though such a use-case is valid.

Relax the conditions enabling the GR engine to also include the case
where an external firmware has also been loaded.

Signed-off-by: Alexandre Courbot <acour...@nvidia.com>
---
 drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c 
b/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
index f3c7329da0a0..e5b75f189988 100644
--- a/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
@@ -1259,10 +1259,13 @@ nvc0_graph_ctor(struct nouveau_object *parent, struct 
nouveau_object *engine,
        struct nvc0_graph_oclass *oclass = (void *)bclass;
        struct nouveau_device *device = nv_device(parent);
        struct nvc0_graph_priv *priv;
+       bool use_ext_fw, enable;
        int ret, i;
 
-       ret = nouveau_graph_create(parent, engine, bclass,
-                                  (oclass->fecs.ucode != NULL), &priv);
+       use_ext_fw = nouveau_boolopt(device->cfgopt, "NvGrUseFW", false);
+       enable = use_ext_fw || oclass->fecs.ucode != NULL;
+
+       ret = nouveau_graph_create(parent, engine, bclass, enable, &priv);
        *pobject = nv_object(priv);
        if (ret)
                return ret;
@@ -1272,7 +1275,7 @@ nvc0_graph_ctor(struct nouveau_object *parent, struct 
nouveau_object *engine,
 
        priv->base.units = nvc0_graph_units;
 
-       if (nouveau_boolopt(device->cfgopt, "NvGrUseFW", false)) {
+       if (use_ext_fw) {
                nv_info(priv, "using external firmware\n");
                if (nvc0_graph_ctor_fw(priv, "fuc409c", &priv->fuc409c) ||
                    nvc0_graph_ctor_fw(priv, "fuc409d", &priv->fuc409d) ||
-- 
1.9.2

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