drm/nvc0/gr: fix gpc firmware regression

"drm/nve0-/gr: some new gpc registers can have multiple copies"
5ee86c4190f9e caused a regression for nvc0, because the bit indicating last
transfer has occured was no longer set, resulting in random system lockups.

Reported-by: Ronald Uitermark <ronald645@gmail.com>
Tested-by: Ronald Uitermark <ronald645@gmail.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/graph/fuc/gpc.fuc

@@ -352,6 +352,9 @@ ctx_xfer:
 
 	// per-TPC mmio context
 	xbit $r10 $flags $p1	// direction
+#if !NV_PGRAPH_GPCX_UNK__SIZE
+	or $r10 4		// last
+#endif
 	mov $r11 0x4000
 	sethi $r11 0x500000	// base = NV_PGRAPH_GPC0_TPC0
 	ld b32 $r12 D[$r0 + #gpc_id]

drivers/gpu/drm/nouveau/core/engine/graph/fuc/gpcnvc0.fuc.h

@@ -400,26 +400,26 @@ uint32_t nvc0_grgpc_code[] = {
 	0x0d98000c,
 	0x00e7f001,
 	0x016621f5,
-	0xf101acf0,
-	0xf04000b7,
-	0x0c9850b3,
-	0x0fc4b604,
-	0x9800bcbb,
-	0x0d98010c,
-	0x060f9802,
-	0x0800e7f1,
-	0x016621f5,
-	0x021521f5,
-	0xf40601f4,
-/* 0x0532: ctx_xfer_post */
-	0x17f11412,
-	0x13f04afc,
-	0x0d27f002,
-	0xf50012d0,
-/* 0x0543: ctx_xfer_done */
-	0xf5021521,
-	0xf8047921,
-	0x00000000,
+	0xf001acf0,
+	0xb7f104a5,
+	0xb3f04000,
+	0x040c9850,
+	0xbb0fc4b6,
+	0x0c9800bc,
+	0x020d9801,
+	0xf1060f98,
+	0xf50800e7,
+	0xf5016621,
+	0xf4021521,
+	0x12f40601,
+/* 0x0535: ctx_xfer_post */
+	0xfc17f114,
+	0x0213f04a,
+	0xd00d27f0,
+	0x21f50012,
+/* 0x0546: ctx_xfer_done */
+	0x21f50215,
+	0x00f80479,
 	0x00000000,
 	0x00000000,
 	0x00000000,