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>

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c
index c7c84d3..88582af 100644 (file)
--- 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)