drm/nouveau: rework init ordering so nv50_instmem.c can be less bad

Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 841c63f..8e4a9bc 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -403,7 +403,10 @@
 		man->available_caching = TTM_PL_FLAG_UNCACHED |
 					 TTM_PL_FLAG_WC;
 		man->default_caching = TTM_PL_FLAG_WC;
-		man->gpu_offset = dev_priv->vm_vram_base;
+		if (dev_priv->card_type == NV_50)
+			man->gpu_offset = 0x40000000;
+		else
+			man->gpu_offset = 0;
 		break;
 	case TTM_PL_TT:
 		switch (dev_priv->gart_info.type) {