linux-kernel - Re: [PATCH v6] usb-serial:cp210x: add support to software flow control

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Message-ID: <X8DTtVEzL4X8UJCH@localhost>
Date:   Fri, 27 Nov 2020 11:23:49 +0100
From:   Johan Hovold <johan@...nel.org>
To:     "Wang, Sheng Long" <shenglong.wang.ext@...mens.com>
Cc:     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>,
        "lkp@...el.com" <lkp@...el.com>
Subject: Re: [PATCH v6] usb-serial:cp210x: add support to software flow
 control

[ Again, please do not top-post. Quoting Greg:

  A: http://en.wikipedia.org/wiki/Top_post
  Q: Were do I find info about this thing called top-posting?
  A: Because it messes up the order in which people normally read text.
  Q: Why is top-posting such a bad thing?
  A: Top-posting.
  Q: What is the most annoying thing in e-mail?

  A: No.
  Q: Should I include quotations after my reply?

  http://daringfireball.net/2007/07/on_top
]

On Mon, Nov 23, 2020 at 01:11:24AM +0000, Wang, Sheng Long wrote:
> Hi,  Johan
> 
> Do I add my  software flow control  patch directly to the branch you
> gave me now ? 
> https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial.git/log/?h=cp210x-termios

Yes, please rebase your work on top of that branch. I'll merge it to my
usb-next branch before applying your patch.

> Then, I also need the cp210x_ get_ terminus()  add ixoff / iXon handling?

No, if you rebase your work on top of the above branch, you won't have
to deal with cp210x_get_termios() which has now been removed.

Just add support for software flow control to the new
cp210x_set_flow_control() function (and cp210x_termios_change()).

I think you can even drop get_special_chars() and just leave the rest
set as NUL, which appears to be the default.

Johan