linux-kernel - Re: [PATCH V2 3/4] serial: f81232: implement break control

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Date:   Thu, 30 Aug 2018 09:55:46 +0800
From:   "Ji-Ze Hong (Peter Hong)" <hpeter@...il.com>
To:     johan@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, peter_hong@...tek.com.tw,
        hpeter+linux_kernel@...il.com
Subject: Re: [PATCH V2 3/4] serial: f81232: implement break control

Hi Johan,

This article is duplication with
[PATCH V2 3/4] USB: serial: f81232: implement break control
[PATCH V2 3/4] serial: f81232: implement break control
	(Title not start with USB token)

Should I discard this PATCH_V2 series and re-send PATCH_V3 ?
or could you discard the patch - serial: f81232: implement break control
only ?

Thanks

Ji-Ze Hong (Peter Hong) 於 2018/8/30 上午 09:47 寫道:
> Implement Fintek F81232 break on/off with LCR register.
> It's the same with 16550A LCR register layout.
> 
> Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@...il.com>
> ---
> v2:
> 	1: Fix f81232_break_ctl() for mis-operated set_mask_register().
> 	2: Add set break control bit in f81232_set_termios().
> 
>   drivers/usb/serial/f81232.c | 32 ++++++++++++++++++++++++++------
>   1 file changed, 26 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index 56adae8a9ee0..863430d7535f 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -65,6 +65,7 @@ struct f81232_private {
>   	struct mutex lock;
>   	u8 modem_control;
>   	u8 modem_status;
> +	bool is_break;
>   	speed_t baud_base;
>   	struct work_struct lsr_work;
>   	struct work_struct interrupt_work;
> @@ -377,13 +378,24 @@ static void f81232_process_read_urb(struct urb *urb)
>   
>   static void f81232_break_ctl(struct tty_struct *tty, int break_state)
>   {
> -	/* FIXME - Stubbed out for now */
> +	struct usb_serial_port *port = tty->driver_data;
> +	struct f81232_private *priv = usb_get_serial_port_data(port);
> +	int status;
> +	u8 tmp = 0;
>   
> -	/*
> -	 * break_state = -1 to turn on break, and 0 to turn off break
> -	 * see drivers/char/tty_io.c to see it used.
> -	 * last_set_data_urb_value NEVER has the break bit set in it.
> -	 */
> +	mutex_lock(&priv->lock);
> +
> +	if (break_state) {
> +		priv->is_break = !!break_state;
> +		tmp = UART_LCR_SBC;
> +	}
> +
> +	status = f81232_set_mask_register(port, LINE_CONTROL_REGISTER,
> +						UART_LCR_SBC, tmp);
> +	if (status)
> +		dev_err(&port->dev, "set break failed: %d\n", status);
> +
> +	mutex_unlock(&priv->lock);
>   }
>   
>   static int f81232_find_clk(speed_t baudrate)
> @@ -519,6 +531,7 @@ static int f81232_port_disable(struct usb_serial_port *port)
>   static void f81232_set_termios(struct tty_struct *tty,
>   		struct usb_serial_port *port, struct ktermios *old_termios)
>   {
> +	struct f81232_private *priv = usb_get_serial_port_data(port);
>   	u8 new_lcr = 0;
>   	int status = 0;
>   	speed_t baudrate;
> @@ -572,11 +585,18 @@ static void f81232_set_termios(struct tty_struct *tty,
>   		break;
>   	}
>   
> +	mutex_lock(&priv->lock);
> +
> +	if (priv->is_break)
> +		new_lcr |= UART_LCR_SBC;
> +
>   	status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
>   	if (status) {
>   		dev_err(&port->dev, "%s failed to set LCR: %d\n",
>   			__func__, status);
>   	}
> +
> +	mutex_unlock(&priv->lock);
>   }
>   
>   static int f81232_tiocmget(struct tty_struct *tty)
> 

-- 
With Best Regards,
Peter Hong