On Sat, 2 Apr 2016 19:07:16 +0200
Grigori Goronzy <greg@xxxxxxxxxxxx> wrote:
> With the new reinitialization method, configuring parity, different
> frame lengths and different stop bit settings work as expected on
> both CH340G and CH341A. This has been extensively tested with a
> logic analyzer.
>
> Tested-by: Ryan Barber <rfb@xxxxxxxxxxxxx>
> Signed-off-by: Grigori Goronzy <greg@xxxxxxxxxxxx>
> ---
> drivers/usb/serial/ch341.c | 36 ++++++++++++++++++++++++++++++------
> 1 file changed, 30 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
> index c001773..4d66f0f 100644
> --- a/drivers/usb/serial/ch341.c
> +++ b/drivers/usb/serial/ch341.c
> @@ -346,6 +346,7 @@ static void ch341_set_termios(struct tty_struct *tty,
> unsigned baud_rate;
> unsigned long flags;
> unsigned char ctrl;
> + unsigned cflag = tty->termios.c_cflag;
> int r;
>
> /* redundant changes may cause the chip to lose bytes */
> @@ -356,7 +357,35 @@ static void ch341_set_termios(struct tty_struct *tty,
>
> priv->baud_rate = baud_rate;
>
> - ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
> + ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX;
> +
> + switch (cflag & CSIZE) {
> + case CS5:
> + ctrl |= CH341_LCR_CS5;
> + break;
> + case CS6:
> + ctrl |= CH341_LCR_CS6;
> + break;
> + case CS7:
> + ctrl |= CH341_LCR_CS7;
> + break;
> + case CS8:
> + default:
> + ctrl |= CH341_LCR_CS8;
In the default case tty-.termios.c_cflag should also be updated to show
CS8
Alan
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