linux-kernel - [ 19/52] serial: omap: fix software flow control

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Message-Id: <20121004210637.747450703@linuxfoundation.org>
Date:	Thu,  4 Oct 2012 14:21:10 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Shubhrajyoti D <shubhrajyoti@...com>,
	Vikram Pandita <vikram.pandita@...com>,
	Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...com>
Subject: [ 19/52] serial: omap: fix software flow control

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 957ee7270d632245b43f6feb0e70d9a5e9ea6cf6 upstream.

Software flow control register bits were not defined correctly.

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

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/plat-omap/include/plat/omap-serial.h |    4 ++--
 drivers/tty/serial/omap-serial.c              |   12 ++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)

--- 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
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -649,19 +649,19 @@ 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);


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