linux-kernel - RE: [PATCH] mmc: core: Wait for Vdd to settle on card power off

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Message-ID:
 <PH7PR16MB619690B7FCB6997563631B28E5FF2@PH7PR16MB6196.namprd16.prod.outlook.com>
Date: Thu, 13 Feb 2025 10:22:44 +0000
From: Avri Altman <Avri.Altman@...disk.com>
To: Erick Shepherd <erick.shepherd@...com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>, "adrian.hunter@...el.com"
	<adrian.hunter@...el.com>, "gratian.crisan@...rson.com"
	<gratian.crisan@...rson.com>, Kyle Roeschley <kyle.roeschley@...com>, Brad
 Mouring <brad.mouring@...com>
Subject: RE: [PATCH] mmc: core: Wait for Vdd to settle on card power off

> Subject: [PATCH] mmc: core: Wait for Vdd to settle on card power off
                                              ^^^^
Should be a host patch?

> 
> The SD spec version 6.0 section 6.4.1.5 requires that Vdd must be lowered to
> less than 0.5V for a minimum of 1 ms when powering off a card. Increase our
> wait to 15 ms so that voltage has time to drain down to 0.5V.
> 
> Signed-off-by: Kyle Roeschley <kyle.roeschley@...com>
> Signed-off-by: Brad Mouring <brad.mouring@...com>
> Signed-off-by: Erick Shepherd <erick.shepherd@...com>
Acked-by: Avri Altman <avri.altman@...disk.com>

> ---
>  drivers/mmc/host/sdhci.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index
> f4a7733a8ad2..b15a1f107549 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2415,6 +2415,9 @@ void sdhci_set_ios(struct mmc_host *mmc, struct
> mmc_ios *ios)
>  	else
>  		sdhci_set_power(host, ios->power_mode, ios->vdd);
> 
> +	if (ios->power_mode == MMC_POWER_OFF)
> +		mdelay(15);
> +
>  	if (host->ops->platform_send_init_74_clocks)
>  		host->ops->platform_send_init_74_clocks(host, ios-
> >power_mode);
> 
> --
> 2.43.0
>