diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 21053db93ff1..54051ec7b499 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -54,9 +54,6 @@
 #define MTK_UART_TX_TRIGGER	1
 #define MTK_UART_RX_TRIGGER	MTK_UART_RX_SIZE
 
-#define MTK_UART_FEATURE_SEL	39	/* Feature Selection register */
-#define MTK_UART_FEAT_NEWRMAP	BIT(0)	/* Use new register map */
-
 #define MTK_UART_XON1		40	/* I/O: Xon character 1 */
 #define MTK_UART_XOFF1		42	/* I/O: Xoff character 1 */
 
@@ -575,10 +572,6 @@ static int mtk8250_probe(struct platform_device *pdev)
 		uart.dma = data->dma;
 #endif
 
-	/* Set AP UART new register map */
-	writel(MTK_UART_FEAT_NEWRMAP, uart.port.membase +
-	       (MTK_UART_FEATURE_SEL << uart.port.regshift));
-
 	/* Disable Rate Fix function */
 	writel(0x0, uart.port.membase +
 			(MTK_UART_RATE_FIX << uart.port.regshift));