drm/nouveau/disp/nv04: avoid creation of output paths

Fixes hitting WARN_ON() during initialisation of pre-NV50 GPUs, caused
by the recent changes to support pad macro routing on GM20x.

We currently don't use them here for older GPUs anyway.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c
index c7c84d34d97e..88582af8bd89 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c
@@ -267,6 +267,8 @@ nvkm_disp_oneinit(struct nvkm_engine *engine)
         /* Create output path objects for each VBIOS display path. */
         i = -1;
         while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE))) {
+                if (ver < 0x40) /* No support for chipsets prior to NV50. */
+                        break;
                 if (dcbE.type == DCB_OUTPUT_UNUSED)
                         continue;
                 if (dcbE.type == DCB_OUTPUT_EOL)