diff options
| -rw-r--r-- | drivers/usb/serial/ch341.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 1f6761a4daaf..db39b6a6d247 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -99,6 +99,8 @@ struct ch341_private { u8 mcr; u8 msr; u8 lcr; + + u8 version; }; static void ch341_set_termios(struct tty_struct *tty, @@ -184,6 +186,9 @@ static int ch341_set_baudrate_lcr(struct usb_device *dev, if (r) return r; + if (priv->version < 0x30) + return 0; + r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, lcr); if (r) return r; @@ -235,7 +240,9 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size); if (r < 0) goto out; - dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]); + + priv->version = buffer[0]; + dev_dbg(&dev->dev, "Chip version: 0x%02x\n", priv->version); r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0); if (r < 0) |