diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
index c3327875933e..f58803de37cb 100644
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
@@ -964,6 +964,7 @@ enum dmub_status dmub_srv_wait_for_inbox0_ack(struct dmub_srv *dmub, uint32_t ti
 		ack = dmub->hw_funcs.read_inbox0_ack_register(dmub);
 		if (ack)
 			return DMUB_STATUS_OK;
+		udelay(1);
 	}
 	return DMUB_STATUS_TIMEOUT;
 }