Re: [PATCH 1/2] mmc: add MMC_QUIRK_NONSTD_FUNC_IF

[Chris Ball <cjb@laptop.org>]

Hi,

On Tue, Apr 05 2011, Ohad Ben-Cohen wrote:
> Introduce MMC_QUIRK_NONSTD_FUNC_IF to ignore the "SDIO Standard Function
> interface code" as indicated by the card's FBR, and instead treat all
> functions as non-standard interfaces.
>
> This is required to prevent standard drivers from facing
> errors when trying to communicate with SDIO cards that erroneously
> indicate standard function interface codes.
>
> Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
> ---
> Chris, I've posted this one before. Sending it again, this time with a follow-up patch that uses the new mmc quirks facility. thanks!
>
>  drivers/mmc/core/sdio.c  |    6 ++++++
>  include/linux/mmc/card.h |    6 ++++++
>  2 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index 4221670..c3c2bd0 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -16,6 +16,7 @@
>  #include <linux/mmc/card.h>
>  #include <linux/mmc/sdio.h>
>  #include <linux/mmc/sdio_func.h>
> +#include <linux/mmc/sdio_ids.h>
>  
>  #include "core.h"
>  #include "bus.h"
> @@ -31,6 +32,11 @@ static int sdio_read_fbr(struct sdio_func *func)
>  	int ret;
>  	unsigned char data;
>  
> +	if (mmc_card_nonstd_func_interface(func->card)) {
> +		func->class = SDIO_CLASS_NONE;
> +		return 0;
> +	}
> +
>  	ret = mmc_io_rw_direct(func->card, 0, 0,
>  		SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
>  	if (ret)
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index adb4888..c7f1532 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -125,6 +125,7 @@ struct mmc_card {
>  #define MMC_QUIRK_NONSTD_SDIO	(1<<2)		/* non-standard SDIO card attached */
>  						/* (missing CIA registers) */
>  #define MMC_QUIRK_BROKEN_CLK_GATING (1<<3)	/* clock gating the sdio bus will make card fail */
> +#define MMC_QUIRK_NONSTD_FUNC_IF (1<<4)		/* SDIO card has nonstd function interfaces */
>  
>  	unsigned int		erase_size;	/* erase size in sectors */
>   	unsigned int		erase_shift;	/* if erase unit is power 2 */
> @@ -180,6 +181,11 @@ static inline int mmc_blksz_for_byte_mode(const struct mmc_card *c)
>  	return c->quirks & MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
>  }
>  
> +static inline int mmc_card_nonstd_func_interface(const struct mmc_card *c)
> +{
> +	return c->quirks & MMC_QUIRK_NONSTD_FUNC_IF;
> +}
> +
>  #define mmc_card_name(c)	((c)->cid.prod_name)
>  #define mmc_card_id(c)		(dev_name(&(c)->dev))

Thanks, pushed to mmc-next for .40.

- Chris.
-- 
Chris Ball   <cjb@laptop.org>   <http://printf.net/>
One Laptop Per Child