On Tue, Feb 17, 2015 at 10:11:55AM -0500, Nicolas PLANEL wrote:
> Hi,
>
>
> According to git log your are currently the two maintainer of the ch341 usb
> serial driver.
>
> Thanks to pyserial, that did not initialize the serial port speed like
> minicom.
> Basically pyserial only set the port speed (calling TIOCSSERIAL ioctl) if
> the user request a different value different currently used. (TIOCGSERIAL)
>
> A long sentence in short code :
>
> if ser.baudrate != user_requested_baudrate:
> ser.baudrate = user_requested_baudrate
>
> In short, if the python code open a serial port at a speed of 57600 baud,
> the hw speed line will be in reality at 9600 baud. (driver default speed)
>
>
> Regards,
>
> Nicolas PLANEL
>
> ===
> From 16df0d507a653c48f757635f717f2ba886f8c5ff Mon Sep 17 00:00:00 2001
> From: Nicolas PLANEL <[email protected]>
> Date: Tue, 17 Feb 2015 00:59:14 -0500
> Subject: [PATCH] USB: ch341: set tty baud speed according to tty struct
>
> The ch341_set_baudrate() function initialize the device baud speed according
> to the value on priv->baud_rate. By default the ch341_open() set it to a
> hardcoded value (DEFAULT_BAUD_RATE 9600). Unfortunately, the tty_struct is
> not initialized with the same default value. (usually 56700)
>
> This means that the tty_struct and the device baud rate generator are not
> synchronized after opening the port.
>
> Fixup is elementary simple by calling tty_get_baud_rate() and
> tty_encode_baud_rate() helper to sync up the baud rate during the
> ch341_open() call.
> ---
> drivers/usb/serial/ch341.c | 7 +++++++
> 1 file changed, 7 insertions(+)
Thanks for the patch, but in order to accept it we need a signed-off-by
line as the file Documentation/SubmittingPatches describes.
Also, just send the patch like this, without the text above, as we can't
hand-edit all emails for patches.
>
> diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
> index 2d72aa3..2dbbbf6 100644
> --- a/drivers/usb/serial/ch341.c
> +++ b/drivers/usb/serial/ch341.c
> @@ -307,9 +307,13 @@ static int ch341_open(struct tty_struct *tty, struct
> usb_serial_port *port)
> {
> struct usb_serial *serial = port->serial;
> struct ch341_private *priv = usb_get_serial_port_data(port);
> + unsigned baud;
> int r;
Also, your email client turned all tabs into spaces, making this patch
unable to be applied. It also line-wrapped the patch :(
Can you fix this up and resend?
thanks,
greg k-h
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