linux-kernel - Re: [RESEND PATCH 2/3] mmc: host: sdhci-sprd: Implement the request

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Date:   Tue, 17 Mar 2020 10:02:05 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH 2/3] mmc: host: sdhci-sprd: Implement the
 request_atomic() API

On Mon, Mar 16, 2020 at 7:47 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Wed, 4 Mar 2020 at 08:42, Baolin Wang <baolin.wang7@...il.com> wrote:
> >
> > Implement the request_atomic() API for nonremovable cards, that means
> > we can submit next request in the irq hard handler context to reduce
> > latency.
> >
> > Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
> > ---
> >  drivers/mmc/host/sdhci-sprd.c | 28 ++++++++++++++++++++++++++--
> >  1 file changed, 26 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> > index 2ab42c5..bddf0f3 100644
> > --- a/drivers/mmc/host/sdhci-sprd.c
> > +++ b/drivers/mmc/host/sdhci-sprd.c
> > @@ -426,6 +426,27 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
> >         sdhci_request(mmc, mrq);
> >  }
> >
> > +static void sdhci_sprd_request_atomic(struct mmc_host *mmc,
> > +                                     struct mmc_request *mrq)
> > +{
> > +       struct sdhci_host *host = mmc_priv(mmc);
> > +       struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
> > +
> > +       host->flags |= sprd_host->flags & SDHCI_AUTO_CMD23;
> > +
> > +       /*
> > +        * From version 4.10 onward, ARGUMENT2 register is also as 32-bit
> > +        * block count register which doesn't support stuff bits of
> > +        * CMD23 argument on Spreadtrum's sd host controller.
> > +        */
> > +       if (host->version >= SDHCI_SPEC_410 &&
> > +           mrq->sbc && (mrq->sbc->arg & SDHCI_SPRD_ARG2_STUFF) &&
> > +           (host->flags & SDHCI_AUTO_CMD23))
> > +               host->flags &= ~SDHCI_AUTO_CMD23;
>
> Looks like the above code is a copy of what is done in
> sdhci_sprd_request(). Perhaps add a helper function that deals with
> this to avoid open coding?

Sure. Will do in next version. Thanks.

>
> > +
> > +       sdhci_request_atomic(mmc, mrq);
> > +}
> > +
> >  static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
> >  {
> >         struct sdhci_host *host = mmc_priv(mmc);
> > @@ -561,6 +582,11 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
> >         if (ret)
> >                 goto pltfm_free;
> >
> > +       if (!mmc_card_is_removable(host->mmc))
> > +               host->mmc_host_ops.request_atomic = sdhci_sprd_request_atomic;
> > +       else
> > +               host->always_defer_done = true;
> > +
> >         sprd_host = TO_SPRD_HOST(host);
> >         sdhci_sprd_phy_param_parse(sprd_host, pdev->dev.of_node);
> >
> > @@ -654,8 +680,6 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
> >         if (ret)
> >                 goto err_cleanup_host;
> >
> > -       host->always_defer_done = true;
> > -
> >         ret = __sdhci_add_host(host);
> >         if (ret)
> >                 goto err_cleanup_host;
> > --
> > 1.9.1
> >
>
> Kind regards
> Uffe



-- 
Baolin Wang