linux-kernel - RE: [“PATCH” 1/2] mmc: sdhci-of-arasan: Use clock-frequency property to update clk

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Date:   Thu, 17 Jun 2021 10:18:10 +0000
From:   Sai Krishna Potthuri <lakshmis@...inx.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Michal Simek <michals@...inx.com>,
        Manish Narani <MNARANI@...inx.com>
CC:     "rashmi.a@...el.com" <rashmi.a@...el.com>,
        "linux-drivers-review-request@...ists.intel.com" 
        <linux-drivers-review-request@...ists.intel.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kishon <kishon@...com>, Vinod Koul <vkoul@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        Mark Gross <mgross@...ux.intel.com>,
        "kris.pan@...ux.intel.com" <kris.pan@...ux.intel.com>,
        "furong.zhou@...el.com" <furong.zhou@...el.com>,
        "mallikarjunappa.sangannavar@...el.com" 
        <mallikarjunappa.sangannavar@...el.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "mahesh.r.vaidya@...el.com" <mahesh.r.vaidya@...el.com>,
        "nandhini.srikandan@...el.com" <nandhini.srikandan@...el.com>,
        "Raja Subramanian, Lakshmi Bai" 
        <lakshmi.bai.raja.subramanian@...el.com>
Subject: RE: [“PATCH” 1/2] mmc: sdhci-of-arasan: Use clock-frequency property to update clk_xin

Hi,

> -----Original Message-----
> From: Ulf Hansson <ulf.hansson@...aro.org>
> Sent: Thursday, June 17, 2021 3:34 PM
> To: Michal Simek <michals@...inx.com>; Manish Narani
> <MNARANI@...inx.com>; Sai Krishna Potthuri <lakshmis@...inx.com>
> Cc: rashmi.a@...el.com; linux-drivers-review-request@...ists.intel.com;
> linux-mmc <linux-mmc@...r.kernel.org>; Linux ARM <linux-arm-
> kernel@...ts.infradead.org>; Linux Kernel Mailing List <linux-
> kernel@...r.kernel.org>; Kishon <kishon@...com>; Vinod Koul
> <vkoul@...nel.org>; Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com>; linux-phy@...ts.infradead.org; Mark
> Gross <mgross@...ux.intel.com>; kris.pan@...ux.intel.com;
> furong.zhou@...el.com; mallikarjunappa.sangannavar@...el.com; Adrian
> Hunter <adrian.hunter@...el.com>; mahesh.r.vaidya@...el.com;
> nandhini.srikandan@...el.com; Raja Subramanian, Lakshmi Bai
> <lakshmi.bai.raja.subramanian@...el.com>
> Subject: Re: [“PATCH” 1/2] mmc: sdhci-of-arasan: Use clock-frequency
> property to update clk_xin
> 
> On Fri, 4 Jun 2021 at 08:13, Michal Simek <michal.simek@...inx.com> wrote:
> >
> >
> >
> > On 6/3/21 8:22 PM, rashmi.a@...el.com wrote:
> > > From: Rashmi A <rashmi.a@...el.com>
> > >
> > > If clock-frequency property is set and it is not the same as the
> > > current clock rate of clk_xin(base clock frequency), set clk_xin to
> > > use the provided clock rate.
> > >
> > > Signed-off-by: Rashmi A <rashmi.a@...el.com>
> > > Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>
> > > ---
> > >  drivers/mmc/host/sdhci-of-arasan.c | 14 ++++++++++++--
> > >  1 file changed, 12 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/mmc/host/sdhci-of-arasan.c
> > > b/drivers/mmc/host/sdhci-of-arasan.c
> > > index 839965f7c717..0e7c07ed9690 100644
> > > --- a/drivers/mmc/host/sdhci-of-arasan.c
> > > +++ b/drivers/mmc/host/sdhci-of-arasan.c
> > > @@ -1542,6 +1542,8 @@ static int sdhci_arasan_probe(struct
> platform_device *pdev)
> > >               }
> > >       }
> > >
> > > +     sdhci_get_of_property(pdev);
> > > +
> > >       sdhci_arasan->clk_ahb = devm_clk_get(dev, "clk_ahb");
> > >       if (IS_ERR(sdhci_arasan->clk_ahb)) {
> > >               ret = dev_err_probe(dev,
> > > PTR_ERR(sdhci_arasan->clk_ahb), @@ -1561,14 +1563,22 @@ static int
> sdhci_arasan_probe(struct platform_device *pdev)
> > >               goto err_pltfm_free;
> > >       }
> > >
> > > +     /* If clock-frequency property is set, use the provided value */
> > > +     if (pltfm_host->clock &&
> > > +         pltfm_host->clock != clk_get_rate(clk_xin)) {
> > > +             ret = clk_set_rate(clk_xin, pltfm_host->clock);
> > > +             if (ret) {
> > > +                     dev_err(&pdev->dev, "Failed to set SD clock rate\n");
> > > +                     goto clk_dis_ahb;
> > > +             }
> > > +     }
> > > +
> > >       ret = clk_prepare_enable(clk_xin);
> > >       if (ret) {
> > >               dev_err(dev, "Unable to enable SD clock.\n");
> > >               goto clk_dis_ahb;
> > >       }
> > >
> > > -     sdhci_get_of_property(pdev);
> > > -
> > >       if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
> > >               sdhci_arasan->quirks |=
> > > SDHCI_ARASAN_QUIRK_FORCE_CDTEST;
> > >
> > >
> >
> > Manish/Sai: Please retest this on Xilinx SOC.
> >
> > Thanks,
> > Michal
> 
> I am about to queue this patch, but it would be nice to get your confirmation
> and tested-by tags before doing so. Would that be possible within the next
> couple of days?
Tested this patch on Xilinx platforms.
Tested-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>

Regards
Sai Krishna