linux-kernel - [PATCH 2/2] serial: imx: remove the redandunt code

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Message-ID: <1400633789-31979-2-git-send-email-b32955@freescale.com>
Date:	Wed, 21 May 2014 08:56:29 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	<gregkh@...uxfoundation.org>
CC:	<linux-serial@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Huang Shijie <b32955@...escale.com>
Subject: [PATCH 2/2] serial: imx: remove the redandunt code

In the imx_startup(), we will reset the uart port which will reset all
the FIFOs, including the URXD.

So the code to clear the RX FIFO is redandunt. Just remove it.

Signed-off-by: Huang Shijie <b32955@...escale.com>
---
 drivers/tty/serial/imx.c |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 64901d0..febf400 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1161,15 +1161,6 @@ static int imx_startup(struct uart_port *port)
 		temp |= UCR2_IRTS;
 	writel(temp, sport->port.membase + UCR2);
 
-	if (USE_IRDA(sport)) {
-		/* clear RX-FIFO */
-		int i = 64;
-		while ((--i > 0) &&
-			(readl(sport->port.membase + URXD0) & URXD_CHARRDY)) {
-			barrier();
-		}
-	}
-
 	if (!is_imx1_uart(sport)) {
 		temp = readl(sport->port.membase + UCR3);
 		temp |= IMX21_UCR3_RXDMUXSEL;
-- 
1.7.8

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