linux-kernel - Re: [PATCH] usb-serial:cp210x: add support to software flow control

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Date:   Thu, 30 Jul 2020 10:06:39 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sheng Long Wang <china_shenglong@....com>
Cc:     johan@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, jan.kiszka@...mens.com,
        Wang Sheng Long <shenglong.wang.ext@...mens.com>
Subject: Re: [PATCH] usb-serial:cp210x: add support to software flow control

On Thu, Jul 30, 2020 at 03:59:22PM +0800, Sheng Long Wang wrote:
> From: Wang Sheng Long <shenglong.wang.ext@...mens.com>
> 
> When data is transmitted between two serial ports,
> the phenomenon of data loss often occurs. The two kinds
> of flow control commonly used in serial communication
> are hardware flow control and software flow control.
> 
> In serial communication, If you only use RX/TX/GND Pins, you
> can't do hardware flow. So we often used software flow control
> and prevent data loss. The user sets the software flow control
> through the application program, and the application program
> sets the software flow control mode for the serial port
> chip through the driver.
> 
> For the cp210 serial port chip, its driver lacks the
> software flow control setting code, so the user cannot set
> the software flow control function through the application
> program. This adds the missing software flow control.
> 
> Signed-off-by: Wang Sheng Long <shenglong.wang.ext@...mens.com>
> ---
>  drivers/usb/serial/cp210x.c | 118 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 113 insertions(+), 5 deletions(-)

What changed from the previous version of this patch?  That should be
described below the --- line and this is a v2, right?

thanks,

greg k-h