linux-kernel - [PATCH 2/2] serial: imx: disable the receiver ready interrupt for imx_stop

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Date:	Fri, 23 May 2014 12:32:54 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	<gregkh@...uxfoundation.org>
CC:	<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Huang Shijie <b32955@...escale.com>
Subject: [PATCH 2/2] serial: imx: disable the receiver ready interrupt for imx_stop_rx

This patch disables the receiver ready interrupt for imx_stop_rx.
It reduces the interrupt numbers when the uart is going to close
or suspend.

Signed-off-by: Huang Shijie <b32955@...escale.com>
---
 drivers/tty/serial/imx.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index ed6cdf7..6026101 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -440,6 +440,10 @@ static void imx_stop_rx(struct uart_port *port)
 
 	temp = readl(sport->port.membase + UCR2);
 	writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2);
+
+	/* disable the `Receiver Ready Interrrupt` */
+	temp = readl(sport->port.membase + UCR1);
+	writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1);
 }
 
 /*
-- 
1.7.8

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