diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 94175a9..e962a6c 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1368,16 +1368,9 @@ static void imx_enable_dma(struct imx_port *sport)
 
 	/* set UCR1 */
 	temp = readl(sport->port.membase + UCR1);
-	temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN |
-		/* wait for 32 idle frames for IDDMA interrupt */
-		UCR1_ICD_REG(3);
+	temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN;
 	writel(temp, sport->port.membase + UCR1);
 
-	/* set UCR4 */
-	temp = readl(sport->port.membase + UCR4);
-	temp |= UCR4_IDDMAEN;
-	writel(temp, sport->port.membase + UCR4);
-
 	sport->dma_is_enabled = 1;
 }
 
@@ -1395,11 +1388,6 @@ static void imx_disable_dma(struct imx_port *sport)
 	temp &= ~(UCR2_CTSC | UCR2_CTS);
 	writel(temp, sport->port.membase + UCR2);
 
-	/* clear UCR4 */
-	temp = readl(sport->port.membase + UCR4);
-	temp &= ~UCR4_IDDMAEN;
-	writel(temp, sport->port.membase + UCR4);
-
 	sport->dma_is_enabled = 0;
 }