linux-kernel - [PATCH 2/2] davinci: Disable modem status (CTS) interrupts on UART1

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Message-Id: <1294149062-31173-2-git-send-email-michael.williamson@criticallink.com>
Date:	Tue,  4 Jan 2011 08:51:02 -0500
From:	Michael Williamson <michael.williamson@...ticallink.com>
To:	davinci-linux-open-source@...ux.davincidsp.com
Cc:	linux-arm-kernel@...ts.infradead.org, khilman@...prootsystems.com,
	linux-serial@...r.kernel.org, gregkh@...e.de,
	linux-kernel@...r.kernel.org,
	Michael Williamson <michael.williamson@...ticallink.com>
Subject: [PATCH 2/2] davinci: Disable modem status (CTS) interrupts on UART1

All supported configurations of the MityDSP-L138 and MityARM-1808 platforms do
not use the CTS pin associated with UART1 as a CTS function.  Instead, this
pin is typically configured as AHCLKX for the McASP or as the USB reference clock.
Disable the modem status interrupts that may be generated by this pin toggling.

Signed-off-by: Michael Williamson <michael.williamson@...ticallink.com>
---
 arch/arm/mach-davinci/board-mityomapl138.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-davinci/board-mityomapl138.c b/arch/arm/mach-davinci/board-mityomapl138.c
index 0bb5f0c..87ffe06 100644
--- a/arch/arm/mach-davinci/board-mityomapl138.c
+++ b/arch/arm/mach-davinci/board-mityomapl138.c
@@ -17,6 +17,7 @@
 #include <linux/i2c.h>
 #include <linux/i2c/at24.h>
 #include <linux/etherdevice.h>
+#include <linux/serial_8250.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -352,6 +353,16 @@ static struct platform_device da850_pm_device = {
 	.id	= -1,
 };
 
+static void __init mityomapl138_init_serial(void)
+{
+	struct davinci_soc_info *soc_info = &davinci_soc_info;
+	struct device *dev = &soc_info->serial_dev->dev;
+	struct plat_serial8250_port *p = dev->platform_data;
+
+	p[1].flags |= UPF_NO_MSR;
+	davinci_serial_init(&mityomapl138_uart_config);
+}
+
 static void __init mityomapl138_init(void)
 {
 	int ret;
@@ -365,7 +376,7 @@ static void __init mityomapl138_init(void)
 	if (ret)
 		pr_warning("watchdog registration failed: %d\n", ret);
 
-	davinci_serial_init(&mityomapl138_uart_config);
+	mityomapl138_init_serial();
 
 	ret = da8xx_register_i2c(0, &mityomap_i2c_0_pdata);
 	if (ret)
-- 
1.7.0.4

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