linux-kernel - Re: [PATCH 4/4] serial: 8250_dw: Rework ->serial

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Message-ID: <CAHp75Vf36sFqX1SL4Sjz6ZgNXP41Nom0Q1s6Psgv9WMFkKtGtg@mail.gmail.com>
Date:   Tue, 28 Jun 2022 22:11:14 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] serial: 8250_dw: Rework ->serial_out() LCR write
 retry logic

On Tue, Jun 28, 2022 at 3:43 PM Ilpo Järvinen
<ilpo.jarvinen@...ux.intel.com> wrote:
>
> Currently dw8250_verify_write() (was dw8250_check_lcr()) nullifies the
> benefit from differentiated ->serial_out() by having big if tree to
> select correct write type.
>
> Rework the logic such that the LCR write can be retried within the
> relevant ->serial_out() handler:
>   1. Move retries counter on the caller level and pass as pointer to
>      dw8250_verify_write()
>   2. Make dw8250_verify_write() return bool
>   3. Retry the write on caller level (if needed)

I'm wondering if it's possible to utilize one of iopoll.h macro here
instead of copying retries and that not-so-obvious IO poll write.

-- 
With Best Regards,
Andy Shevchenko