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USB: serial: cp210x: fix hardware flow-control disable

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A bug in the CRTSCTS handling caused RTS to alternate between

CRTSCTS=0 => "RTS is transmit active signal" and
CRTSCTS=1 => "RTS is used for receive flow control"

instead of

CRTSCTS=0 => "RTS is statically active" and
CRTSCTS=1 => "RTS is used for receive flow control"

This only happened after first having enabled CRTSCTS.

Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@gmail.com>
Fixes: 39a66b8d22a3 ("[PATCH] USB: CP2101 Add support for flow control")
Cc: stable <stable@vger.kernel.org>
[johan: reword commit message ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Konstantin Shkolnyy 2016-05-04 16:56:52 -05:00 committed by Johan Hovold
parent 8c34d82e9d
commit a377f9e906
1 changed files with 1 additions and 2 deletions
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3
drivers/usb/serial/cp210x.c
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@ -967,8 +967,7 @@ static void cp210x_set_termios(struct tty_struct *tty,
} else {
modem_ctl[0] &= ~0x7B;
modem_ctl[0] |= 0x01;
/* FIXME - OR here instead of assignment looks wrong */
modem_ctl[4] |= 0x40;
modem_ctl[4] = 0x40;
dev_dbg(dev, "%s - flow control = NONE\n", __func__);
}