drm/nouveau/devinit: run devinit scripts right after preinit

This ensures we have a valid mask of disabled engines before we start
trying to execute fini()/init() on the subdevs, potentially touching
devices that don't exist.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/devinit.h

@@ -13,6 +13,7 @@ u32 nvkm_devinit_mmio(struct nvkm_devinit *, u32 addr);
 int nvkm_devinit_pll_set(struct nvkm_devinit *, u32 type, u32 khz);
 void nvkm_devinit_meminit(struct nvkm_devinit *);
 u64 nvkm_devinit_disable(struct nvkm_devinit *);
+int nvkm_devinit_post(struct nvkm_devinit *, u64 *disable);
 
 int nv04_devinit_new(struct nvkm_device *, int, struct nvkm_devinit **);
 int nv05_devinit_new(struct nvkm_device *, int, struct nvkm_devinit **);

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -2167,7 +2167,9 @@ nvkm_device_preinit(struct nvkm_device *device)
 		}
 	}
 
-	/*XXX: devinit */
+	ret = nvkm_devinit_post(device->devinit, &device->disable_mask);
+	if (ret)
+		goto fail;
 
 	time = ktime_to_us(ktime_get()) - time;
 	nvdev_trace(device, "preinit completed in %lldus\n", time);

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/base.c

@@ -50,11 +50,21 @@ nvkm_devinit_meminit(struct nvkm_devinit *init)
 u64
 nvkm_devinit_disable(struct nvkm_devinit *init)
 {
-	if (init->func->disable)
+	if (init && init->func->disable)
 		return init->func->disable(init);
 	return 0;
 }
 
+int
+nvkm_devinit_post(struct nvkm_devinit *init, u64 *disable)
+{
+	int ret = 0;
+	if (init && init->func->post)
+		ret = init->func->post(init, init->post);
+	*disable = nvkm_devinit_disable(init);
+	return ret;
+}
+
 static int
 nvkm_devinit_fini(struct nvkm_subdev *subdev, bool suspend)
 {
@@ -82,17 +92,8 @@ static int
 nvkm_devinit_init(struct nvkm_subdev *subdev)
 {
 	struct nvkm_devinit *init = nvkm_devinit(subdev);
-	int ret;
-
-	ret = init->func->post(init, init->post);
-	if (ret)
-		return ret;
-
 	if (init->func->init)
 		init->func->init(init);
-
-	if (init->func->disable)
-		subdev->device->disable_mask |= init->func->disable(init);
 	return 0;
 }