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From: Daniel Mack on 3 Jun 2010 08:00
Call set_mctrl() and clear_mctrl() according to the flow control mode
selected. This makes serial communication for FT232 connected devices
work when CRTSCTS is not set.

This fixes a regression introduced by 4175f3e31 ("tty_port: If we are
opened non blocking we still need to raise the carrier"). This patch
calls the low-level driver's dtr_rts() function which consequently sets
TIOCM_DTR | TIOCM_RTS. A later call to set_termios() without CRTSCTS in
cflags, however, does not reset these bits, and so data is not actually
sent out on the serial wire.

Signed-off-by: Daniel Mack <daniel(a)caiaq.de>
Cc: Greg Kroah-Hartman <gregkh(a)suse.de>
Cc: Johan Hovold <jhovold(a)gmail.com>
Cc: Alan Cox <alan(a)linux.intel.com>
Cc: linux-usb(a)vger.kernel.org
---
drivers/usb/serial/ftdi_sio.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 050211a..79dd1ae 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2005,6 +2005,8 @@ static void ftdi_set_termios(struct tty_struct *tty,
"urb failed to set to rts/cts flow control\n");
}

+ /* raise DTR/RTS */
+ set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
} else {
/*
* Xon/Xoff code
@@ -2052,6 +2054,8 @@ static void ftdi_set_termios(struct tty_struct *tty,
}
}

+ /* lower DTR/RTS */
+ clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
}
return;
}
--
1.7.1

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