diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/init.c b/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
index df1b1b4..73465cc 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
@@ -199,7 +199,10 @@ init_rdvgai(struct nvbios_init *init, u16 port, u8 index)
 	struct nouveau_subdev *subdev = init->subdev;
 	if (init_exec(init)) {
 		int head = init->crtc < 0 ? 0 : init->crtc;
-		return nv_rdvgai(subdev, head, port, index);
+		if (nv_device(subdev)->card_type >= NV_50)
+			return nv_rd08(subdev, 0x619400 + index);
+		else
+			return nv_rdvgai(subdev, head, port, index);
 	}
 	return 0x00;
 }
@@ -215,7 +218,10 @@ init_wrvgai(struct nvbios_init *init, u16 port, u8 index, u8 value)
 
 	if (init_exec(init)) {
 		int head = init->crtc < 0 ? 0 : init->crtc;
-		nv_wrvgai(init->subdev, head, port, index, value);
+		if (nv_device(init->subdev)->card_type >= NV_50)
+			nv_wr08(init->subdev, 0x619400 + index, value);
+		else
+			nv_wrvgai(init->subdev, head, port, index, value);
 	}
 
 	/* select head 1 if cr44 write selected it */