linux-kernel - Re: [RESEND PATCHv1 3/8] mmc: sdhci-msm: Factor out sdhci_msm

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Date:   Thu, 19 Jan 2017 12:04:55 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ritesh Harjani <riteshh@...eaurora.org>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        shawn.lin@...k-chips.com, linux-arm-msm@...r.kernel.org,
        georgi.djakov@...aro.org, asutoshd@...eaurora.org,
        stummala@...eaurora.org, venkatg@...eaurora.org,
        pramod.gurav@...aro.org, jeremymc@...hat.com, git@...r.de
Subject: Re: [RESEND PATCHv1 3/8] mmc: sdhci-msm: Factor out sdhci_msm_hs400

On 10/01/17 09:00, Ritesh Harjani wrote:
> Factor out sdhci_msm_hs400 used for DLL calibration in HS400
> modes. This function will be needed for enhanced_strobe as well.
> 
> Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-msm.c | 32 ++++++++++++++++++++++++++------
>  1 file changed, 26 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 3fc496e..5a37c29 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -884,6 +884,28 @@ static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
>  	return rc;
>  }
>  
> +/*
> + * sdhci_msm_hs400 - Calibrate the DLL for HS400 bus speed mode operation.
> + * DLL operation is only needed for clock > 100MHz. For clock <= 100MHz
> + * fixed feedback clock is used.
> + */
> +static void sdhci_msm_hs400(struct sdhci_host *host, struct mmc_ios *ios)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> +	int ret;
> +
> +	if (host->clock > CORE_FREQ_100MHZ &&
> +	    msm_host->tuning_done && !msm_host->calibration_done) {
> +		ret = sdhci_msm_hs400_dll_calibration(host);
> +		if (!ret)
> +			msm_host->calibration_done = true;
> +		else
> +			pr_err("%s: Failed to calibrate DLL for hs400 mode (%d)\n",
> +			       mmc_hostname(host->mmc), ret);
> +	}
> +}
> +
>  static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
>  					unsigned int uhs)
>  {
> @@ -952,12 +974,10 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
>  	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
>  
>  	spin_unlock_irq(&host->lock);
> -	/* CDCLP533 HW calibration is only required for HS400 mode*/
> -	if (host->clock > CORE_FREQ_100MHZ &&
> -	    msm_host->tuning_done && !msm_host->calibration_done &&
> -	    mmc->ios.timing == MMC_TIMING_MMC_HS400)
> -		if (!sdhci_msm_hs400_dll_calibration(host))
> -			msm_host->calibration_done = true;
> +
> +	if (mmc->ios.timing == MMC_TIMING_MMC_HS400)
> +		sdhci_msm_hs400(host, &mmc->ios);
> +
>  	spin_lock_irq(&host->lock);
>  }
>  
>