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USB: serial: ch341: fix modem-control and B0 handling

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commit 030ee7ae52 upstream.

The modem-control signals are managed by the tty-layer during open and
should not be asserted prematurely when set_termios is called from
driver open.

Also make sure that the signals are asserted only when changing speed
from B0.

Fixes: 664d5df92e ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Johan Hovold 2017-01-06 19:15:12 +01:00 committed by Ben Hutchings
parent 11b9225d76
commit ccd392802f
1 changed files with 6 additions and 9 deletions
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15
drivers/usb/serial/ch341.c
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@ -369,10 +369,6 @@ static void ch341_set_termios(struct tty_struct *tty,
ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
if (baud_rate) {
spin_lock_irqsave(&priv->lock, flags);
priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
spin_unlock_irqrestore(&priv->lock, flags);
priv->baud_rate = baud_rate;
r = ch341_init_set_baudrate(port->serial->dev, priv, ctrl);
@ -380,13 +376,14 @@ static void ch341_set_termios(struct tty_struct *tty,
priv->baud_rate = tty_termios_baud_rate(old_termios);
tty_termios_copy_hw(tty->termios, old_termios);
}
} else {
spin_lock_irqsave(&priv->lock, flags);
priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
spin_unlock_irqrestore(&priv->lock, flags);
}
ch341_set_handshake(port->serial->dev, priv->line_control);
spin_lock_irqsave(&priv->lock, flags);
if (C_BAUD(tty) == B0)
priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
spin_unlock_irqrestore(&priv->lock, flags);
/* Unimplemented:
* (cflag & CSIZE) : data bits [5, 8]