diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 29932b73c004d758dca894e87afd8d6d899381d1..e95c4971327bff183f5ea191adf18b92f7de72b8 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -755,18 +755,18 @@ static irqreturn_t lpuart32_rxint(int irq, void *dev_id)
 static irqreturn_t lpuart_int(int irq, void *dev_id)
 {
 	struct lpuart_port *sport = dev_id;
-	unsigned char sts;
+	unsigned char sts, crdma;
 
 	sts = readb(sport->port.membase + UARTSR1);
+	crdma = readb(sport->port.membase + UARTCR5);
 
-	if (sts & UARTSR1_RDRF) {
+	if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) {
 		if (sport->lpuart_dma_use)
 			lpuart_prepare_rx(sport);
 		else
 			lpuart_rxint(irq, dev_id);
 	}
-	if (sts & UARTSR1_TDRE &&
-		!(readb(sport->port.membase + UARTCR5) & UARTCR5_TDMAS)) {
+	if (sts & UARTSR1_TDRE && !(crdma & UARTCR5_TDMAS)) {
 		if (sport->lpuart_dma_use)
 			lpuart_pio_tx(sport);
 		else
@@ -1106,6 +1106,7 @@ static int lpuart_startup(struct uart_port *port)
 		setup_timer(&sport->lpuart_timer, lpuart_timer_func,
 			    (unsigned long)sport);
 		temp = readb(port->membase + UARTCR5);
+		temp &= ~UARTCR5_RDMAS;
 		writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
 	}