diff options
| author | Daniel Mack <daniel@caiaq.de> | 2010-06-03 13:55:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-06-04 13:16:19 -0700 |
| commit | 6a1a82df91fa0eb1cc76069a9efe5714d087eccd (patch) | |
| tree | 960e24f709aaf0101a831000a70d194bbc5bdf4c /drivers/usb | |
| parent | 1703a6d3c38944731ba23594843a704d828266f3 (diff) | |
USB: ftdi_sio: fix DTR/RTS line modes
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@caiaq.de>
Cc: Johan Hovold <jhovold@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | 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 050211afc07e..79dd1ae195e5 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; } |