From 2429e94ad394a41b5c2f431958d0df738a775069 Mon Sep 17 00:00:00 2001
From: Liang Li <liang.li@windriver.com>
Date: Sat, 19 Jan 2013 17:52:11 +0800
Subject: [PATCH] --- yaml --- r: 354825 b: refs/heads/master c:
 1f9db0921f212ad8fdf4bacfdf23590e64272f90 h: refs/heads/master i:   354823:
 e51b13505e7304a54899f1cc49e91156a3149b47 v: v3

---
 [refs]                              |  2 +-
 trunk/drivers/tty/serial/pch_uart.c | 27 +++++++++++++++++++--------
 2 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/[refs] b/[refs]
index 836573b804b0..3457a86fdc2c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 384e301e3519599b000c1a2ecd938b533fc15d85
+refs/heads/master: 1f9db0921f212ad8fdf4bacfdf23590e64272f90
diff --git a/trunk/drivers/tty/serial/pch_uart.c b/trunk/drivers/tty/serial/pch_uart.c
index 10e1a95b0c92..1ddfc66b1084 100644
--- a/trunk/drivers/tty/serial/pch_uart.c
+++ b/trunk/drivers/tty/serial/pch_uart.c
@@ -14,18 +14,21 @@
  *along with this program; if not, write to the Free Software
  *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
  */
+#if defined(CONFIG_SERIAL_PCH_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
 #include <linux/kernel.h>
 #include <linux/serial_reg.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/console.h>
 #include <linux/serial_core.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/dmi.h>
-#include <linux/console.h>
 #include <linux/nmi.h>
 #include <linux/delay.h>
 
@@ -553,12 +556,24 @@ static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
 {
 	int i;
 	u8 rbr, lsr;
+	struct uart_port *port = &priv->port;
 
 	lsr = ioread8(priv->membase + UART_LSR);
 	for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
-	     i < rx_size && lsr & UART_LSR_DR;
+	     i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI);
 	     lsr = ioread8(priv->membase + UART_LSR)) {
 		rbr = ioread8(priv->membase + PCH_UART_RBR);
+
+		if (lsr & UART_LSR_BI) {
+			port->icount.brk++;
+			if (uart_handle_break(port))
+				continue;
+		}
+		if (port->sysrq) {
+			if (uart_handle_sysrq_char(port, rbr))
+				continue;
+		}
+
 		buf[i++] = rbr;
 	}
 	return i;
@@ -1023,16 +1038,11 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
 
 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
 {
-	u8 fcr = ioread8(priv->membase + UART_FCR);
 	struct uart_port *port = &priv->port;
 	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
 	char   *error_msg[5] = {};
 	int    i = 0;
 
-	/* Reset FIFO */
-	fcr |= UART_FCR_CLEAR_RCVR;
-	iowrite8(fcr, priv->membase + UART_FCR);
-
 	if (lsr & PCH_UART_LSR_ERR)
 		error_msg[i++] = "Error data in FIFO\n";
 
@@ -1565,7 +1575,8 @@ pch_console_write(struct console *co, const char *s, unsigned int count)
 
 	local_irq_save(flags);
 	if (priv->port.sysrq) {
-		spin_lock(&priv->lock);
+		/* call to uart_handle_sysrq_char already took the priv lock */
+		priv_locked = 0;
 		/* serial8250_handle_port() already took the port lock */
 		port_locked = 0;
 	} else if (oops_in_progress) {