<Tested-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Note that I'm not yet see any performance improvements :)
On Fri, Dec 3, 2010 at 9:13 PM, Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx> wrote:
> From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
> From: Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx>
> 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@xxxxxxxxx>
> ---
> 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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