Re: [PATCH v3 3/3] sdhci-s3c: Add SDHCI_QUIRK_NO_WP_BIT quirk for Samsung SoC

Kyungmin Park
2010-07-23T12:50:33Z

On Fri, Jul 23, 2010 at 8:56 PM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> From: Hyuk Lee <hyuk1.lee@samsung.com>
>
> If host controller doesn't have WP pin which should be connnected with SDMMC
> card WP pin, can implement get_ro function with using the allocated gpio.
> In order to use this quirk wp_gpio in the platform data must be set.
>
> Signed-off-by: Hyuk Lee <hyuk1.lee@samsung.com>
> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
> ---
>  drivers/mmc/host/sdhci-s3c.c |   43 ++++++++++++++++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci.c     |    3 ++
>  drivers/mmc/host/sdhci.h     |    3 ++
>  3 files changed, 49 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
> index 0d25285..0b75e57 100644
> --- a/drivers/mmc/host/sdhci-s3c.c
> +++ b/drivers/mmc/host/sdhci-s3c.c
> @@ -22,6 +22,7 @@
>
>  #include <linux/mmc/host.h>
>
> +#include <plat/gpio-cfg.h>
>  #include <plat/sdhci.h>
>  #include <plat/regs-sdhci.h>
>
> @@ -213,6 +214,36 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
>  }
>
>  /**
> + * sdhci_s3c_get_ro - callback for get_ro
> + * @host: The SDHCI host being changed
> + *
> + * If the WP pin is connected with GPIO, can get the value which indicates
> + * the card is locked or not.
> +*/
> +static int sdhci_s3c_get_ro(struct mmc_host *mmc)
> +{
> +       struct sdhci_s3c *sc;
> +       struct sdhci_host *host;
> +
> +       host = mmc_priv(mmc);
> +       sc = sdhci_priv(host);
> +
> +       return gpio_get_value(sc->pdata->wp_gpio);
> +}
> +
> +/**
> + * sdhci_s3c_cfg_wp - configure GPIO for WP pin
> + * @gpio_num: GPIO number which connected with WP line from SD/MMC slot
> + *
> + * Configure GPIO for using WP line
> +*/
> +static void sdhci_s3c_cfg_wp(unsigned int gpio_num)
> +{
> +       s3c_gpio_cfgpin(gpio_num, S3C_GPIO_INPUT);
> +       s3c_gpio_setpull(gpio_num, S3C_GPIO_PULL_UP);
> +}
> +
> +/**
>  * sdhci_s3c_get_min_clock - callback to get minimal supported clock value
>  * @host: The SDHCI host being queried
>  *
> @@ -375,6 +406,9 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>        if (pdata->cfg_gpio)
>                pdata->cfg_gpio(pdev, pdata->max_width);
>
> +       if (gpio_is_valid(pdata->wp_gpio))
> +               sdhci_s3c_ops.get_ro = sdhci_s3c_get_ro;
> +
>        host->hw_name = "samsung-hsmmc";
>        host->ops = &sdhci_s3c_ops;
>        host->quirks = 0;
> @@ -408,6 +442,15 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>        host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
>                         SDHCI_QUIRK_32BIT_DMA_SIZE);
>
> +       /* Controller's WP pin donsn't connected with SD card and there is an
> +        * allocated GPIO for getting WP data form SD card, use this quirk and
> +        * send the GPIO number in pdata->wp_gpio. */
> +       host->quirks |= SDHCI_QUIRK_NO_WP_BIT;
> +
> +       /* to configure gpio pin as a card write protection signal */
> +       if (gpio_is_valid(pdata->wp_gpio))
> +               sdhci_s3c_cfg_wp(pdata->wp_gpio);
> +

Put it just one place like this.

if (gpio_is_valid(pdata->wp_gpio)) {
sdhci_s3c_cfg_wp(pdata->wp_gpio);
sdhci_s3c_ops.get_ro = sdhci_s3c_get_ro;
host->quirks |= SDHCI_QUIRK_NO_WP_BIT;
}

It reduce the below quirks check by one. If you add the quriks as your
patch, host->quirks are always true whether WP use or not.

Thank you,
Kyungmin Park
>        ret = sdhci_add_host(host);
>        if (ret) {
>                dev_err(dev, "sdhci_add_host() failed\n");
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index f9ca4c6..7fba401 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1198,6 +1198,9 @@ static int sdhci_get_ro(struct mmc_host *mmc)
>
>        host = mmc_priv(mmc);
>
> +       if ((host->quirks & SDHCI_QUIRK_NO_WP_BIT) && host->ops->get_ro)
> +               return host->ops->get_ro(mmc);
> +
>        spin_lock_irqsave(&host->lock, flags);
>
>        if (host->flags & SDHCI_DEVICE_DEAD)
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 0de8b38..dd9a233 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -247,6 +247,8 @@ struct sdhci_host {
>  #define SDHCI_QUIRK_MISSING_CAPS                       (1<<28)
>  /* Controller has nonstandard clock management */
>  #define SDHCI_QUIRK_NONSTANDARD_MINCLOCK               (1<<29)
> +/* Controller has no write-protect pin connected with SD card */
> +#define SDHCI_QUIRK_NO_WP_BIT                          (1<<30)
>
>        int                     irq;            /* Device IRQ */
>        void __iomem *          ioaddr;         /* Mapped address */
> @@ -321,6 +323,7 @@ struct sdhci_ops {
>        unsigned int    (*get_max_clock)(struct sdhci_host *host);
>        unsigned int    (*get_min_clock)(struct sdhci_host *host);
>        unsigned int    (*get_timeout_clock)(struct sdhci_host *host);
> +       int             (*get_ro)(struct mmc_host *mmc);
>  };
>
>  #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
> --
> 1.6.2.5
>
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