linux-kernel - Re: [PATCH] mmc: sdhci-esdhc-imx: support eMMC DDR mode when running at 3.3V

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Date:   Mon, 2 Jul 2018 16:36:30 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Stefan Agner <stefan@...er.ch>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Haibo Chen <haibo.chen@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: sdhci-esdhc-imx: support eMMC DDR mode when running
 at 3.3V

On 28 June 2018 at 09:31, Stefan Agner <stefan@...er.ch> wrote:
> The uSDHC supports DDR modes for eMMC devices running at 3.3V. This
> allows to run eMMC with 3.3V signaling voltage at DDR52 mode:
>
>   # cat /sys/kernel/debug/mmc1/ios
>   clock:          52000000 Hz
>   vdd:            21 (3.3 ~ 3.4 V)
>   bus mode:       2 (push-pull)
>   chip select:    0 (don't care)
>   power mode:     2 (on)
>   bus width:      3 (8 bits)
>   timing spec:    8 (mmc DDR52)
>   signal voltage: 0 (3.30 V)
>   driver type:    0 (driver type B)
>
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Thanks, applied for next!

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index b716b933f00a..6f444731754d 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -1324,7 +1324,7 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
>
>         if (esdhc_is_usdhc(imx_data)) {
>                 host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
> -               host->mmc->caps |= MMC_CAP_1_8V_DDR;
> +               host->mmc->caps |= MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR;
>                 if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
>                         host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
>
> --
> 2.18.0
>