HPI feature is a new feature in eMMC4.41 standard. It will be used to interrupt background operations and low priority foreground operations
Signed-off-by: Chuanxiao Dong <[email protected]> --- drivers/mmc/core/mmc.c | 32 ++++++++++++++++++++++++++++++++ include/linux/mmc/card.h | 2 ++ include/linux/mmc/mmc.h | 2 ++ 3 files changed, 36 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 6a97736..bc05aa4 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -317,6 +317,19 @@ static int mmc_read_ext_csd(struct mmc_card *card) card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN]; } + + /* check whether the eMMC card support HPI */ + if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { + card->ext_csd.hpi = 1; + card->ext_csd.hpi_en = + ext_csd[EXT_CSD_HPI_MGMT]; + if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2) + card->ext_csd.hpi_cmd = + MMC_STOP_TRANSMISSION; + else + card->ext_csd.hpi_cmd = + MMC_SEND_STATUS; + } } if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) @@ -537,6 +550,25 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* + * enable HPI feature if eMMC card support + */ + if (card->ext_csd.hpi) { + if (!card->ext_csd.hpi_en) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HPI_MGMT, 1); + if (err && err != -EBADMSG) + goto free_card; + + if (err) { + card->ext_csd.hpi_en = 0; + err = 0; + } else { + card->ext_csd.hpi_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 426bed4..6d4b90c 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -57,6 +57,8 @@ struct mmc_ext_csd { bool bkops; /* BKOPS support bit */ bool bkops_en; /* BKOPS enable bit */ bool hpi_en; /* HPI enable bit */ + bool hpi; /* HPI support bit */ + unsigned int hpi_cmd; /* cmd used to for HPI */ }; struct sd_scr { diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index a0f306b..2cfbafd 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -258,6 +258,7 @@ struct _mmc_csd { * EXT_CSD fields */ +#define EXT_CSD_HPI_MGMT 161 /* R/W */ #define EXT_CSD_BKOPS_EN 163 /* R/W */ #define EXT_CSD_BKOPS_START 164 /* W */ #define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */ @@ -276,6 +277,7 @@ struct _mmc_csd { #define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */ #define EXT_CSD_TRIM_MULT 232 /* RO */ #define EXT_CSD_BKOPS_SUPPORT 502 /* RO */ +#define EXT_CSD_HPI_FEATURES 503 /* RO */ /* * EXT_CSD field definitions -- 1.6.6.1 _______________________________________________ MeeGo-kernel mailing list [email protected] http://lists.meego.com/listinfo/meego-kernel
