diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index d799140e53b6a649b51ace8129b8846ed695a824..dff0f0a472ea3591fa5209f1329c04c7f233e217 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -496,8 +496,7 @@ static void dma_tx_callback(void *data)
 
 	dev_dbg(sport->port.dev, "we finish the TX DMA.\n");
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(&sport->port);
+	uart_write_wakeup(&sport->port);
 
 	if (waitqueue_active(&sport->dma_wait)) {
 		wake_up(&sport->dma_wait);