linux-kernel - Re: [PATCH] mmc: sdhci-acpi: set non-removable in ACPI table

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Date:	Thu, 3 Dec 2015 16:14:47 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Philip Elcan <pelcan@...eaurora.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	linux-arm-msm@...r.kernel.org, Timur Tabi <timur@...eaurora.org>,
	Jon Masters <jcm@...hat.org>,
	Mark Langsdorf <mlangsdo@...hat.com>
Subject: Re: [PATCH] mmc: sdhci-acpi: set non-removable in ACPI table

On 03/12/15 15:48, Philip Elcan wrote:
> This allows setting an SDHC controller as non-removable
> by using the _RMV method in the ACPI table. It doesn't

Is that _RMV on the host controller?  Shouldn't it be on the card i.e. child
device node?

> mark it as non-removable if GPIO card detection is
> already setup.
> 
> Signed-off-by: Philip Elcan <pelcan@...eaurora.org>
> ---
>  drivers/mmc/host/sdhci-acpi.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
> index f6047fc..8c06ba6 100644
> --- a/drivers/mmc/host/sdhci-acpi.c
> +++ b/drivers/mmc/host/sdhci-acpi.c
> @@ -288,6 +288,20 @@ static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid,
>  	return NULL;
>  }
>  
> +static bool sdhci_acpi_is_removable(acpi_handle handle)
> +{
> +	acpi_status status;
> +	unsigned long long removable = 1; /* default to removable */
> +
> +	if (acpi_has_method(handle, "_EJ0"))
> +		return true;
> +	status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
> +	if (ACPI_SUCCESS(status) && !removable)
> +		return false;
> +
> +	return true;
> +}
> +
>  static int sdhci_acpi_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -300,6 +314,7 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
>  	const char *hid;
>  	const char *uid;
>  	int err;
> +	bool gpio_cd = false;
>  
>  	if (acpi_bus_get_device(handle, &device))
>  		return -ENODEV;
> @@ -373,9 +388,14 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
>  		if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL)) {
>  			dev_warn(dev, "failed to setup card detect gpio\n");
>  			c->use_runtime_pm = false;
> +		} else {
> +			gpio_cd = true;
>  		}
>  	}
>  
> +	if (!gpio_cd && !sdhci_acpi_is_removable(handle))
> +		host->mmc->caps |= MMC_CAP_NONREMOVABLE;
> +
>  	err = sdhci_add_host(host);
>  	if (err)
>  		goto err_free;
> 

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