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serial: bfin-uart: Enable hardware automatic CTS only when CTS pin is available. 

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sonic Zhang 2011-12-13 12:22:01 +08:00 committed by Greg Kroah-Hartman
parent 5c2f37dddd
commit b48dc711c3
1 changed files with 10 additions and 9 deletions
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19
drivers/tty/serial/bfin_uart.c
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@ -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,
0, "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;
dev_info(port->dev, "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);