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

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Date:   Wed, 29 Jun 2022 11:47:36 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.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, 28 Jun 2022, Andy Shevchenko wrote:

> 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.

Eh, are you suggesting I should do write as a side-effect inside one of 
the iopoll.h macros? Because those available seem to only read?

Or should I create another macro there which writes too?


-- 
 i.