drm/nouveau/kms/nv50-: disable dcb parsing

- nvkm should provide all this info now
- preparation for GSP-RM
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-45-lyude@redhat.com

drivers/gpu/drm/nouveau/nouveau_bios.c

@@ -2093,9 +2093,11 @@ nouveau_bios_init(struct drm_device *dev)
 	if (!NVInitVBIOS(dev))
 		return -ENODEV;
 
-	ret = parse_dcb_table(dev, bios);
-	if (ret)
-		return ret;
+	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
+		ret = parse_dcb_table(dev, bios);
+		if (ret)
+			return ret;
+	}
 
 	if (!bios->major_version)	/* we don't run version 0 bios */
 		return 0;

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -724,10 +724,10 @@ nouveau_display_create(struct drm_device *dev)
 	drm_kms_helper_poll_init(dev);
 	drm_kms_helper_poll_disable(dev);
 
-	if (nouveau_modeset != 2 && drm->vbios.dcb.entries) {
-		ret = nvif_disp_ctor(&drm->client.device, "kmsDisp", 0,
-				     &disp->disp);
-		if (ret == 0) {
+	if (nouveau_modeset != 2) {
+		ret = nvif_disp_ctor(&drm->client.device, "kmsDisp", 0, &disp->disp);
+
+		if (!ret && (disp->disp.outp_mask || drm->vbios.dcb.entries)) {
 			nouveau_display_create_properties(dev);
 			if (disp->disp.object.oclass < NV50_DISP) {
 				dev->mode_config.fb_modifiers_not_supported = true;

drivers/gpu/drm/nouveau/nvif/disp.c

@@ -60,7 +60,7 @@ nvif_disp_ctor(struct nvif_device *device, const char *name, s32 oclass, struct
 	cid = nvif_sclass(&device->object, disps, oclass);
 	disp->object.client = NULL;
 	if (cid < 0) {
-		NVIF_ERRON(cid, &device->object, "[NEW disp%04x] not supported", oclass);
+		NVIF_DEBUG(&device->object, "[NEW disp%04x] not supported", oclass);
 		return cid;
 	}