linux-kernel - Re: [PATCH 1/2] mmc: tmio: move MFD variant reset to a platform hook

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Date:   Wed, 3 Oct 2018 20:34:55 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mmc: tmio: move MFD variant reset to a platform hook

Hi Wolfram,


On Wed, Oct 3, 2018 at 8:02 AM Wolfram Sang <wsa@...-dreams.de> wrote:
>
> Hi Yamada-san,
>
> On Mon, Oct 01, 2018 at 09:31:01PM +0900, Masahiro Yamada wrote:
> > CTL_RESET_SDIO register is specific to the TMIO MFD (tmio_mmc.c).
> >
> > Add a new hook host->reset for performing a platform-specific reset
> > sequence, and move CTL_RESET_SDIO over there.
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>
> I like it in general.
>
> > +static void tmio_mmc_reset(struct tmio_mmc_host *host)
> > +{
> > +     sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
> > +     usleep_range(10000, 11000);
> > +     sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
> > +     usleep_range(10000, 11000);
> > +}
> > +
>
> Are you sure resetting SDIO works independently of resetting SD? Maybe
> we should add resetting SD here, too, to keep the pattern...

I am not 100% sure
since I do not have this hardware.


> > --- a/drivers/mmc/host/tmio_mmc_core.c
> > +++ b/drivers/mmc/host/tmio_mmc_core.c
> > @@ -164,14 +164,13 @@ static void tmio_mmc_reset(struct tmio_mmc_host *host)
> >  {
> >       /* FIXME - should we set stop clock reg here */
> >       sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
> > -     if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
> > -             sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
> >       usleep_range(10000, 11000);
> >       sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
> > -     if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
> > -             sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
> >       usleep_range(10000, 11000);
>
> ... and have this simplified reset pattern either also in a seperate
> function, or doing...
>
> >
> > +     if (host->reset)
> > +             host->reset(host);
>         else
>                 simplified_reset_pattern
>
> ?
>
> What's your opinion?


OK, I will send v2.



> Regards,
>
>    Wolfram
>


-- 
Best Regards
Masahiro Yamada