linux-kernel - Re: [PATCH v3] usb-serial:cp210x: add support to software flow control

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Date:   Mon, 24 Aug 2020 11:43:07 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     "Wang, Sheng Long (EXT) (RC-CN DI FA R&D SW)" 
        <shenglong.wang.ext@...mens.com>, Johan Hovold <johan@...nel.org>,
        Sheng Long Wang <china_shenglong@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] usb-serial:cp210x: add support to software flow
 control

On Mon, Aug 24, 2020 at 11:36:50AM +0200, Jan Kiszka wrote:
> On 24.08.20 11:28, Wang, Sheng Long (EXT) (RC-CN DI FA R&D SW) wrote:
> > Hi Johan,
> > 
> >     Thanks for your reminding. I am adjusting patch according to the latest Linux Master branch.
> 
> Use git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial.git, branch
> is likely usb-linus, as Johan requested - just in case there is another
> conflict due to a patch not yet in Linux master but in that tree.

The usb-next is used for new features like this one, but again,
currently Linus's master branch works as well.

> > -----Original Message-----
> > From: Johan Hovold <johan@...nel.org> 
> > Sent: Monday, August 24, 2020 5:10 PM
> > To: Kiszka, Jan (CT RDA IOT SES-DE) <jan.kiszka@...mens.com>
> > Cc: Sheng Long Wang <china_shenglong@....com>; Wang, Sheng Long (EXT) (RC-CN DI FA R&D SW) <shenglong.wang.ext@...mens.com>; johan@...nel.org; gregkh@...uxfoundation.org; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH v3] usb-serial:cp210x: add support to software flow control
> > 
> > On Fri, Aug 21, 2020 at 07:32:58AM +0200, Jan Kiszka wrote:
> >> On 20.08.20 09:52, 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>
> >>>
> >>> Changes in v3:
> >>> -fixed code style, It mainly adjusts the code style acccording  to 
> >>> kernel specification.
> >>
> >> Patch does not apply. You forgot to rebase over latest tty/tty-next or 
> >> linux master.
> > 
> > That should be the usb-next branch of the usb-serial tree:
> > 
> > 	https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial.git/
> > 
> > or linux-next (or, currently, Linus's master branch).
> > 
> > You can use "scripts/get_maintainer.sh --scm" to determine which tree to base your work against.
> 
> Thanks for correcting! But it's scripts/get_maintainer.pl. ;)

Heh. Thanks for catching that.

Johan