A recent change added support for modifying the default line-control
settings, but did not make sure that the modified settings were used as
part of reconfiguration after a device has been reset during resume.
This caused a port that was open before suspend to be unusable until
being closed and reopened.
Fixes: ba781bdf8662 ("USB: serial: ch341: add support for parity, frame
length, stop bits")
Signed-off-by: Johan Hovold <[email protected]>
---
drivers/usb/serial/ch341.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 2d07fa037f02..e1dd096106d1 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -95,6 +95,7 @@ struct ch341_private {
unsigned baud_rate; /* set baud rate */
u8 line_control; /* set line control value RTS/DTR */
u8 line_status; /* active status of modem control inputs */
+ u8 lcr;
};
static void ch341_set_termios(struct tty_struct *tty,
@@ -213,7 +214,6 @@ static int ch341_configure(struct usb_device *dev, struct
ch341_private *priv)
const unsigned int size = 2;
char *buffer;
int r;
- u8 lcr;
buffer = kmalloc(size, GFP_KERNEL);
if (!buffer)
@@ -229,16 +229,11 @@ static int ch341_configure(struct usb_device *dev, struct
ch341_private *priv)
if (r < 0)
goto out;
- /*
- * Some CH340 devices appear unable to change the initial LCR
- * settings, so set a sane 8N1 default.
- */
- lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
- r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, lcr);
+ r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, priv->lcr);
if (r < 0)
goto out;
- r = ch341_init_set_baudrate(dev, priv, lcr);
+ r = ch341_init_set_baudrate(dev, priv, priv->lcr);
if (r < 0)
goto out;
@@ -259,6 +254,11 @@ static int ch341_port_probe(struct usb_serial_port *port)
spin_lock_init(&priv->lock);
priv->baud_rate = DEFAULT_BAUD_RATE;
+ /*
+ * Some CH340 devices appear unable to change the initial LCR
+ * settings, so set a sane 8N1 default.
+ */
+ priv->lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
r = ch341_configure(port->serial->dev, priv);
if (r < 0)
@@ -399,6 +399,8 @@ static void ch341_set_termios(struct tty_struct *tty,
if (r < 0 && old_termios) {
priv->baud_rate = tty_termios_baud_rate(old_termios);
tty_termios_copy_hw(&tty->termios, old_termios);
+ } else if (r == 0) {
+ priv->lcr = ctrl;
}
}
--
2.10.2
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