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

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Message-ID: <558D38DF.1080201@linaro.org>
Date:	Fri, 26 Jun 2015 14:34:55 +0300
From:	Georgi Djakov <georgi.djakov@...aro.org>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>,
	Ulf Hansson <ulf.hansson@...aro.org>
CC:	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 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 <ivan.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.

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

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