[PATCH 1/2] serial: bfin-uart: Enable hardware automatic CTS only when CTS pin is available.

Sonic Zhang
2011-12-09T06:07:29Z

From: Sonic Zhang <sonic.zhang@analog.com>

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
---
drivers/tty/serial/bfin_uart.c | 19 ++++++++++---------
1 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 21bfa9a..57747c4 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -726,16 +726,17 @@ static int bfin_serial_startup(struct uart_port *port)
}
#endif
#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
- if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
- bfin_serial_mctrl_cts_int,
- IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
- uart->cts_pin = -1;
- pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
- }
+ if (uart->cts_pin >= 0) {
+ if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
+ IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
+ uart->cts_pin = -1;
+ pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
+ }

- /* CTS RTS PINs are negative assertive. */
- UART_PUT_MCR(uart, ACTS);
- UART_SET_IER(uart, EDSSI);
+ /* CTS RTS PINs are negative assertive. */
+ UART_PUT_MCR(uart, ACTS);
+ UART_SET_IER(uart, EDSSI);
+ }
#endif

UART_SET_IER(uart, ERBFI);
--
1.7.0.4