diff options
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index e54de0037df4..e27c761ec984 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2803,6 +2803,27 @@ static void serial8250_console_putchar(struct uart_port *port, int ch) } /* + * Restore serial console when h/w power-off detected + */ +static void serial8250_console_restore(struct uart_8250_port *up) +{ + struct uart_port *port = &up->port; + struct ktermios termios; + unsigned int baud, quot, frac = 0; + + termios.c_cflag = port->cons->cflag; + if (port->state->port.tty && termios.c_cflag == 0) + termios.c_cflag = port->state->port.tty->termios.c_cflag; + + baud = serial8250_get_baud_rate(port, &termios, NULL); + quot = serial8250_get_divisor(up, baud, &frac); + + serial8250_set_divisor(port, baud, quot, frac); + serial_port_out(port, UART_LCR, up->lcr); + serial_port_out(port, UART_MCR, UART_MCR_DTR | UART_MCR_RTS); +} + +/* * Print a string to the serial port trying not to disturb * any possible real use of the port... * @@ -2839,20 +2860,7 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s, /* check scratch reg to see if port powered off during system sleep */ if (up->canary && (up->canary != serial_port_in(port, UART_SCR))) { - struct ktermios termios; - unsigned int baud, quot, frac = 0; - - termios.c_cflag = port->cons->cflag; - if (port->state->port.tty && termios.c_cflag == 0) - termios.c_cflag = port->state->port.tty->termios.c_cflag; - - baud = serial8250_get_baud_rate(port, &termios, NULL); - quot = serial8250_get_divisor(up, baud, &frac); - - serial8250_set_divisor(port, baud, quot, frac); - serial_port_out(port, UART_LCR, up->lcr); - serial_port_out(port, UART_MCR, UART_MCR_DTR | UART_MCR_RTS); - + serial8250_console_restore(up); up->canary = 0; } |