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serial: 8250: Refactor serial console restore-from-suspend

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Move h/w reinit of serial console restore-from-suspend into
standalone helper function.

No functional change.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-09-25 15:36:11 -04:00 committed by Greg Kroah-Hartman
parent 4f56f3fdca
commit 10791233e9
1 changed files with 22 additions and 14 deletions
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36
drivers/tty/serial/8250/8250_port.c
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@ -2802,6 +2802,27 @@ static void serial8250_console_putchar(struct uart_port *port, int ch)
serial_port_out(port, UART_TX, 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;
}