diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index b0f46e666e1a..816d1a23f9d0 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -350,8 +350,7 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
 		serial_omap_stop_tx(&up->port);
 		return;
 	}
-	count = up->port.fifosize -
-		(serial_in(up, UART_OMAP_TXFIFO_LVL) & 0xFF);
+	count = up->port.fifosize / 4;
 	do {
 		serial_out(up, UART_TX, xmit->buf[xmit->tail]);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
index 97c26beae605..e6322605b138 100644
--- a/include/uapi/linux/serial_reg.h
+++ b/include/uapi/linux/serial_reg.h
@@ -366,7 +366,6 @@
 #define UART_OMAP_MDR1_FIR_MODE		0x05	/* FIR mode */
 #define UART_OMAP_MDR1_CIR_MODE		0x06	/* CIR mode */
 #define UART_OMAP_MDR1_DISABLE		0x07	/* Disable (default state) */
-#define UART_OMAP_TXFIFO_LVL		0x1A	/* TX FIFO fullness */
 
 /*
  * These are definitions for the Exar XR17V35X and XR17(C|D)15X