linux-kernel - Re: [PATCH v2 1/6] mmc: sdhci-pci: Read card detect from ACPI for Intel Merrifield

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Message-ID: <ca00991c-f2ab-645a-a297-018d7b6b0b41@intel.com>
Date:   Thu, 14 Oct 2021 12:54:04 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Raul E Rangel <rrangel@...omium.org>,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2 1/6] mmc: sdhci-pci: Read card detect from ACPI for
 Intel Merrifield

On 13/10/2021 23:17, Andy Shevchenko wrote:
> Intel Merrifield platform had been converted to use ACPI enumeration.
> However, the driver missed an update to retrieve card detect GPIO.
> Fix it here.
> 
> Unfortunately we can't rely on CD GPIO state because there are two
> different PCB designs in the wild that are using the opposite card
> detection sense and there is no way to distinguish those platforms,
> that's why ignore CD GPIO completely and use it only as an event.
> 
> Fixes: 4590d98f5a4f ("sfi: Remove framework for deprecated firmware")
> BugLink: https://github.com/edison-fw/meta-intel-edison/issues/135
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

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

> ---
>  drivers/mmc/host/sdhci-pci-core.c | 29 ++++++++++++++++++++++++-----
>  1 file changed, 24 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index be19785227fe..d0f2edfe296c 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -616,16 +616,12 @@ static int intel_select_drive_strength(struct mmc_card *card,
>  	return intel_host->drv_strength;
>  }
>  
> -static int bxt_get_cd(struct mmc_host *mmc)
> +static int sdhci_get_cd_nogpio(struct mmc_host *mmc)
>  {
> -	int gpio_cd = mmc_gpio_get_cd(mmc);
>  	struct sdhci_host *host = mmc_priv(mmc);
>  	unsigned long flags;
>  	int ret = 0;
>  
> -	if (!gpio_cd)
> -		return 0;
> -
>  	spin_lock_irqsave(&host->lock, flags);
>  
>  	if (host->flags & SDHCI_DEVICE_DEAD)
> @@ -638,6 +634,21 @@ static int bxt_get_cd(struct mmc_host *mmc)
>  	return ret;
>  }
>  
> +static int bxt_get_cd(struct mmc_host *mmc)
> +{
> +	int gpio_cd = mmc_gpio_get_cd(mmc);
> +
> +	if (!gpio_cd)
> +		return 0;
> +
> +	return sdhci_get_cd_nogpio(mmc);
> +}
> +
> +static int mrfld_get_cd(struct mmc_host *mmc)
> +{
> +	return sdhci_get_cd_nogpio(mmc);
> +}
> +
>  #define SDHCI_INTEL_PWR_TIMEOUT_CNT	20
>  #define SDHCI_INTEL_PWR_TIMEOUT_UDELAY	100
>  
> @@ -1341,6 +1352,14 @@ static int intel_mrfld_mmc_probe_slot(struct sdhci_pci_slot *slot)
>  					 MMC_CAP_1_8V_DDR;
>  		break;
>  	case INTEL_MRFLD_SD:
> +		slot->cd_idx = 0;
> +		slot->cd_override_level = true;
> +		/*
> +		 * There are two PCB designs of SD card slot with the opposite
> +		 * card detection sense. Quirk this out by ignoring GPIO state
> +		 * completely in the custom ->get_cd() callback.
> +		 */
> +		slot->host->mmc_host_ops.get_cd = mrfld_get_cd;
>  		slot->host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
>  		break;
>  	case INTEL_MRFLD_SDIO:
>