linux-kernel - Re: [PATCH v2 1/4]enable background operations for supported eMMC card

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Message-ID: <AANLkTikPAmpJq7Q7riDPGq5UkhAa9cuXRW7kjuNGv6oB@mail.gmail.com>
Date:	Mon, 6 Dec 2010 10:12:10 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Chuanxiao Dong <chuanxiao.dong@...el.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	cjb@...top.org, akpm@...ux-foundation.org, arjan@...ux.intel.com,
	alan@...ux.intel.com
Subject: Re: [PATCH v2 1/4]enable background operations for supported eMMC card

<Tested-by: Kyungmin Park <kyungmin.park@...sung.com>

Note that I'm not yet see any performance improvements :)

On Fri, Dec 3, 2010 at 9:13 PM, Chuanxiao Dong <chuanxiao.dong@...el.com> wrote:
> From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
> From: Chuanxiao Dong <chuanxiao.dong@...el.com>
> Date: Mon, 22 Nov 2010 16:31:12 +0800
> Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card supports
>
> Background operations is a new feature defined in eMMC4.41 standard.
> Since this feature is opertional for eMMC card, so driver only enable
> for those eMMC card which supports this feature
>
> Signed-off-by: Chuanxiao Dong <chuanxiao.dong@...el.com>
> ---
>  drivers/mmc/core/mmc.c   |   26 ++++++++++++++++++++++++++
>  include/linux/mmc/card.h |    2 ++
>  include/linux/mmc/mmc.h  |    3 +++
>  3 files changed, 31 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 77f93c3..471ed82 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -310,6 +310,14 @@ static int mmc_read_ext_csd(struct mmc_card *card)
>                        ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
>                card->ext_csd.trim_timeout = 300 *
>                        ext_csd[EXT_CSD_TRIM_MULT];
> +
> +               /* detect whether the eMMC card support BKOPS */
> +               if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
> +                       card->ext_csd.bkops = 1;
> +                       card->ext_csd.bkops_en =
> +                               ext_csd[EXT_CSD_BKOPS_EN];
> +               }
> +
>        }
>
>        if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
> @@ -484,6 +492,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
>        }
>
>        /*
> +        * enable BKOPS if eMMC card supports.
> +        */
> +       if (card->ext_csd.bkops) {
> +               if (!card->ext_csd.bkops_en) {
> +                       err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> +                                       EXT_CSD_BKOPS_EN, 1);
> +                       if (err && err != -EBADMSG)
> +                               goto free_card;
> +
> +                       if (err) {
> +                               card->ext_csd.bkops_en = 0;
> +                               err = 0;
> +                       } else
> +                               card->ext_csd.bkops_en = 1;
> +               }
> +       }
> +
> +       /*
>         * Activate high speed (if supported)
>         */
>        if ((card->ext_csd.hs_max_dtr != 0) &&
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 8ce0827..9b755cb 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -54,6 +54,8 @@ struct mmc_ext_csd {
>        unsigned int            sec_trim_mult;  /* Secure trim multiplier  */
>        unsigned int            sec_erase_mult; /* Secure erase multiplier */
>        unsigned int            trim_timeout;           /* In milliseconds */
> +       unsigned int            bkops:1; /* background support bit */
> +       unsigned int            bkops_en:1; /* background enable bit */
>  };
>
>  struct sd_scr {
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 956fbd8..14f7813 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -251,6 +251,8 @@ struct _mmc_csd {
>  * EXT_CSD fields
>  */
>
> +#define EXT_CSD_BKOPS_EN               163     /* R/W */
> +#define EXT_CSD_BKOPS_START            164     /* W */
>  #define EXT_CSD_ERASE_GROUP_DEF                175     /* R/W */
>  #define EXT_CSD_ERASED_MEM_CONT                181     /* RO */
>  #define EXT_CSD_BUS_WIDTH              183     /* R/W */
> @@ -266,6 +268,7 @@ struct _mmc_csd {
>  #define EXT_CSD_SEC_ERASE_MULT         230     /* RO */
>  #define EXT_CSD_SEC_FEATURE_SUPPORT    231     /* RO */
>  #define EXT_CSD_TRIM_MULT              232     /* RO */
> +#define EXT_CSD_BKOPS_SUPPORT  502     /* RO */
>
>  /*
>  * EXT_CSD field definitions
> --
> 1.6.6.1
>
>
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