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serial: assert DTR for serial console devices

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Some RS-232 devices require DTR to be asserted before they can be used.  DTR
is normally asserted in uart_startup() when the port is opened.  But we don't
actually open serial console ports, so assert DTR when the port is added.

BTW:
earlyprintk and early_uart are hard coded to set DTR/RTS.

rmk says

  The only issue I can think of is the possibility for an attached modem to
  auto-answer or maybe even auto-dial before the system is ready for it to do
  so.  Might have an undesirable cost implication for some running with such a
  setup.

  Apart from that, I can't think of any other side effect of this specific
  patch.

Signed-off-by: Yinghai Lu <[email protected]>
Acked-by: Russell King <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yinghai Lu 2007-07-15 23:37:25 -07:00 • committed by Linus Torvalds
commit 79492689e4
1 changed files with 6 additions and 0 deletions
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6
drivers/serial/serial_core.c
View file

@ -1910,6 +1910,12 @@ uart_set_options(struct uart_port *port, struct console *co,
if (flow == 'r')
termios.c_cflag |= CRTSCTS;
/*
* some uarts on other side don't support no flow control.
* So we set * DTR in host uart to make them happy
*/
port->mctrl |= TIOCM_DTR;
port->ops->set_termios(port, &termios, NULL);
co->cflag = termios.c_cflag;