linux-kernel - Re: [PATCH V12 16/23] mmc: sdhci-uhs2: add clock operations

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Date:   Fri, 17 Nov 2023 18:50:08 +0800
From:   Victor Shih <victorshihgli@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     adrian.hunter@...el.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, benchuanggli@...il.com,
        HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
        takahiro.akashi@...aro.org, dlunev@...omium.org,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V12 16/23] mmc: sdhci-uhs2: add clock operations

On Tue, Oct 3, 2023 at 7:13 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Fri, 15 Sept 2023 at 11:44, Victor Shih <victorshihgli@...il.com> wrote:
> >
> > From: Victor Shih <victor.shih@...esyslogic.com.tw>
> >
> > This is a sdhci version of mmc's uhs2_[enable|disable]_clk operations.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> > Acked-by: Adrian Hunter <adrian.hunter@...el.com>
>
> The similar comments as posted for patch 15 applies to $subject patch
> too. Please have a look at those and fix these for the $subject patch
> too.
>

Hi, Ulf

I will merge patch#15, patch#16 and patch#17 into one patch(patch#15)
for version 13.

Thanks, Victor Shih

> > ---
> >
> > Updates in V8:
> >  - Remove unnecessary include file.
> >  - read_poll_timeout() to instead of read_poll_timeout_atomic()
> >    in sdhci_uhs2_enable_clk().
> >  - Put the comment on the end and put the lines in descending
> >    line length in sdhci_uhs2_enable_clk().
> >  - Modify return value in sdhci_uhs2_enable_clk().
> >
> > Updates in V6:
> >  - Remove unnecessary functions.
> >
> > ---
> >
> >  drivers/mmc/host/sdhci-uhs2.c | 30 ++++++++++++++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 4c2a56629ab3..af1b0c5e48fd 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -329,6 +329,36 @@ static int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >         return 0;
> >  }
> >
> > +static int sdhci_uhs2_disable_clk(struct mmc_host *mmc)
> > +{
> > +       struct sdhci_host *host = mmc_priv(mmc);
> > +       u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > +
> > +       clk &= ~SDHCI_CLOCK_CARD_EN;
> > +       sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +
> > +       return 0;
> > +}
> > +
> > +static int sdhci_uhs2_enable_clk(struct mmc_host *mmc)
> > +{
> > +       struct sdhci_host *host = mmc_priv(mmc);
> > +       u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > +       int timeout_us = 20000; /* 20ms */
> > +       u32 val;
> > +
> > +       clk |= SDHCI_CLOCK_CARD_EN;
> > +       sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +
> > +       if (read_poll_timeout(sdhci_readw, val, (val & SDHCI_CLOCK_INT_STABLE),
> > +                             10, timeout_us, true, host, SDHCI_CLOCK_CONTROL)) {
> > +               pr_err("%s: Internal clock never stabilised.\n", mmc_hostname(host->mmc));
> > +               sdhci_dumpregs(host);
> > +               return -EIO;
> > +       }
> > +       return 0;
> > +}
> > +
> >  /*****************************************************************************\
> >   *                                                                           *
> >   * Driver init/exit                                                          *
>
> Kind regards
> Uffe