diff options
Diffstat (limited to 'drivers/usb/serial/ch341.c')
| -rw-r--r-- | drivers/usb/serial/ch341.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index eabdd05a2147..8d7b0847109b 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -133,8 +133,8 @@ static int ch341_control_in(struct usb_device *dev, return r; } -static int ch341_init_set_baudrate(struct usb_device *dev, - struct ch341_private *priv, unsigned ctrl) +static int ch341_set_baudrate_lcr(struct usb_device *dev, + struct ch341_private *priv, u8 lcr) { short a; int r; @@ -157,9 +157,19 @@ static int ch341_init_set_baudrate(struct usb_device *dev, factor = 0x10000 - factor; a = (factor & 0xff00) | divisor; - /* 0x9c is "enable SFR_UART Control register and timer" */ - r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, - 0x9c | (ctrl << 8), a | 0x80); + /* + * CH341A buffers data until a full endpoint-size packet (32 bytes) + * has been received unless bit 7 is set. + */ + a |= BIT(7); + + r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, a); + if (r) + return r; + + r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, lcr); + if (r) + return r; return r; } @@ -233,7 +243,7 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) if (r < 0) goto out; - r = ch341_init_set_baudrate(dev, priv, priv->lcr); + r = ch341_set_baudrate_lcr(dev, priv, priv->lcr); if (r < 0) goto out; @@ -394,7 +404,7 @@ static void ch341_set_termios(struct tty_struct *tty, if (baud_rate) { priv->baud_rate = baud_rate; - r = ch341_init_set_baudrate(port->serial->dev, priv, ctrl); + r = ch341_set_baudrate_lcr(port->serial->dev, priv, ctrl); if (r < 0 && old_termios) { priv->baud_rate = tty_termios_baud_rate(old_termios); tty_termios_copy_hw(&tty->termios, old_termios); |