diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/ibus/gk20a.c b/drivers/gpu/drm/nouveau/nvkm/subdev/ibus/gk20a.c
index b7159b338fac..1a4ab825852c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/ibus/gk20a.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/ibus/gk20a.c
@@ -29,7 +29,7 @@ gk20a_ibus_init_ibus_ring(struct nvkm_subdev *ibus)
 	nvkm_mask(device, 0x137250, 0x3f, 0);
 
 	nvkm_mask(device, 0x000200, 0x20, 0);
-	usleep_range(20, 30);
+	udelay(20);
 	nvkm_mask(device, 0x000200, 0x20, 0x20);
 
 	nvkm_wr32(device, 0x12004c, 0x4);