linux-kernel - Re: [PATCH] mmc: sdhci: msm: Boost controller core clock

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Date:	Fri, 26 Jun 2015 14:59:22 +0300
From:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
To:	Georgi Djakov <georgi.djakov@...aro.org>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] mmc: sdhci: msm: Boost controller core clock


On Fri, 2015-06-26 at 14:34 +0300, Georgi Djakov wrote:
> On 06/26/2015 02:16 PM, Ivan T. Ivanov wrote:
> > Ensure SDCC is working with maximum clock otherwise card
> > detection could be extremely slow, up to 7 seconds.
> > 
> > Signed-off-by: Ivan T. Ivanov ivanov@...aro.org>
> > ---
> >  drivers/mmc/host/sdhci-msm.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> > index 4a09f76..b2556bc 100644
> > --- a/drivers/mmc/host/sdhci-msm.c
> > +++ b/drivers/mmc/host/sdhci-msm.c
> > @@ -489,6 +489,11 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> >                 goto pclk_disable;
> >         }
> > 
> > +       /* Vote for maximum clock rate for maximum performance */
> > +       ret = clk_set_rate(msm_host->clk, INT_MAX);
> > +       if (ret)
> > +               dev_warn(&pdev->dev, "core clock boost falied\n");
> 
> failed?
> 
> Otherwise looks good to me.
> 

Oops, will fix.

Thanks,
Ivan

> > +
> >         ret = clk_prepare_enable(msm_host->clk);
> >         if (ret)
> >                 goto pclk_disable;
> > --
> > 1.9.1
> > 
> 
> 
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