drm/gk104/gr: therm magic needed on some kepler boards

Not needed everywhere, and potentially not safe to do depending on how
the rest of PTHERM is configured...

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c b/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c
index 6e73b18920b8..f7c011217175 100644
--- a/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c
+++ b/drivers/gpu/drm/nouveau/core/engine/graph/nve4.c
@@ -189,6 +189,29 @@ nve4_graph_pack_mmio[] = {
  * PGRAPH engine/subdev functions
  ******************************************************************************/
 
+static int
+nve4_graph_fini(struct nouveau_object *object, bool suspend)
+{
+        struct nvc0_graph_priv *priv = (void *)object;
+
+        /*XXX: this is a nasty hack to power on gr on certain boards
+         *     where it's disabled by therm, somehow.  ideally it'd
+         *     be nice to know when we should be doing this, and why,
+         *     but, it's yet to be determined.  for now we test for
+         *     the particular mmio error that occurs in the situation,
+         *     and then bash therm in the way nvidia do.
+         */
+        nv_mask(priv, 0x000200, 0x08001000, 0x08001000);
+        nv_rd32(priv, 0x000200);
+        if (nv_rd32(priv, 0x400700) == 0xbadf1000) {
+                nv_mask(priv, 0x000200, 0x08001000, 0x00000000);
+                nv_rd32(priv, 0x000200);
+                nv_mask(priv, 0x020004, 0xc0000000, 0x40000000);
+        }
+
+        return nouveau_graph_fini(&priv->base, suspend);
+}
+
 int
 nve4_graph_init(struct nouveau_object *object)
 {
@@ -327,7 +350,7 @@ nve4_graph_oclass = &(struct nvc0_graph_oclass) {
                 .ctor = nvc0_graph_ctor,
                 .dtor = nvc0_graph_dtor,
                 .init = nve4_graph_init,
-                .fini = _nouveau_graph_fini,
+                .fini = nve4_graph_fini,
         },
         .cclass = &nve4_grctx_oclass,
         .sclass = nve4_graph_sclass,