linux-kernel - [PATCH v4 18/21] serial: omap: fix software flow control

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Date:	Thu,  6 Sep 2012 15:45:37 +0300
From:	Felipe Balbi <balbi@...com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	alan@...ux.intel.com, Tony Lindgren <tony@...mide.com>,
	Kevin Hilman <khilman@...com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Shubhrajyoti Datta <shubhrajyoti@...com>,
	Sourav Poddar <sourav.poddar@...com>,
	Vikram Pandita <vikram.pandita@...com>, stable@...r.kernel.org,
	Felipe Balbi <balbi@...com>
Subject: [PATCH v4 18/21] serial: omap: fix software flow control

From: Vikram Pandita <vikram.pandita@...com>

Software flow control register bits were not defined correctly.

Also clarify the IXON and IXOFF logic to reflect what userspace wants.

Cc: stable@...r.kernel.org
Tested-by: Shubhrajyoti D <shubhrajyoti@...com>
Signed-off-by: Vikram Pandita <vikram.pandita@...com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@...com>
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Felipe Balbi <balbi@...com>
---
 arch/arm/plat-omap/include/plat/omap-serial.h |  4 ++--
 drivers/tty/serial/omap-serial.c              | 12 ++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h
index 90d2d74..a79ed8b 100644
--- a/arch/arm/plat-omap/include/plat/omap-serial.h
+++ b/arch/arm/plat-omap/include/plat/omap-serial.h
@@ -42,10 +42,10 @@
 #define OMAP_UART_WER_MOD_WKUP	0X7F
 
 /* Enable XON/XOFF flow control on output */
-#define OMAP_UART_SW_TX		0x04
+#define OMAP_UART_SW_TX		0x8
 
 /* Enable XON/XOFF flow control on input */
-#define OMAP_UART_SW_RX		0x04
+#define OMAP_UART_SW_RX		0x2
 
 #define OMAP_UART_SYSC_RESET	0X07
 #define OMAP_UART_TCR_TRIG	0X0F
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 6a58f4f..1ba1f43 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -617,19 +617,19 @@ serial_omap_configure_xonxoff
 
 	/*
 	 * IXON Flag:
-	 * Enable XON/XOFF flow control on output.
-	 * Transmit XON1, XOFF1
+	 * Flow control for OMAP.TX
+	 * OMAP.RX should listen for XON/XOFF
 	 */
 	if (termios->c_iflag & IXON)
-		up->efr |= OMAP_UART_SW_TX;
+		up->efr |= OMAP_UART_SW_RX;
 
 	/*
 	 * IXOFF Flag:
-	 * Enable XON/XOFF flow control on input.
-	 * Receiver compares XON1, XOFF1.
+	 * Flow control for OMAP.RX
+	 * OMAP.TX should send XON/XOFF
 	 */
 	if (termios->c_iflag & IXOFF)
-		up->efr |= OMAP_UART_SW_RX;
+		up->efr |= OMAP_UART_SW_TX;
 
 	serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
 	serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
-- 
1.7.12.rc3

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