commit 64851636d568ae9f167cd5d1dcdbfe17e6eef73c
author Sonic Zhang <sonic.zhang@analog.com> Tue Dec 13 12:22:02 2011 +0800
committer Greg Kroah-Hartman <gregkh@suse.de> Tue Dec 13 09:50:15 2011 -0800
tree 326080595e354d09fb4f93b7f904ae1a84719a2a
parent b48dc711c33034958768fadf15f75abff95fb499

serial: bfin-uart: Remove ASYNC_CTS_FLOW flag for hardware automatic CTS.

Blackfin uart supports automatic CTS trigger when hardware flow control is enabled.
No need to start and top tx in CTS interrupt. So, remote ASYNC_CTS_FLOW flag.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/tty/serial/bfin_uart.c

diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index dedd9ab..26953bf 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -116,11 +116,20 @@
 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
 {
 	struct bfin_serial_port *uart = dev_id;
-	unsigned int status;
-
-	status = bfin_serial_get_mctrl(&uart->port);
+	unsigned int status = bfin_serial_get_mctrl(&uart->port);
 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+	struct tty_struct *tty = uart->port.state->port.tty;
+
 	UART_CLEAR_SCTS(uart);
+	if (tty->hw_stopped) {
+		if (status) {
+			tty->hw_stopped = 0;
+			uart_write_wakeup(&uart->port);
+		}
+	} else {
+		if (!status)
+			tty->hw_stopped = 1;
+	}
 #endif
 	uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 
@@ -1358,7 +1367,9 @@
 			uart->cts_pin = -1;
 		else {
 			uart->cts_pin = res->start;
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
 			uart->port.flags |= ASYNC_CTS_FLOW;
+#endif
 		}
 
 		res = platform_get_resource(pdev, IORESOURCE_IO, 1);