Hi, Alexey.
On 01/27/2015 11:01 PM, Alexey Skidanov wrote:
> This patch is coming to fix compatibility issue of BKOPS_EN field of EXT_CSD.
> In eMMC-5.1, BKOPS_EN was changed, and now it has two operational bits:
> Bit 0 - MANUAL_EN
> Bit 1 - AUTO_EN
> In previous eMMC revisions, only Bit 0 was supported.
Well, i don't have eMMC5.1 spec, so i want to know more exactly what is "auto_enable".
If AUTO_EN is set, what happen?
I can't find where auto_bkops_en is used.
Best Regards,
Jaehoon CHung
>
> Signed-off-by: Alexey Skidanov <alexey.skidanov@xxxxxxxxxxx>
> ---
> drivers/mmc/core/core.c | 2 +-
> drivers/mmc/core/mmc.c | 6 ++++--
> include/linux/mmc/card.h | 5 ++++-
> include/linux/mmc/mmc.h | 6 ++++++
> 4 files changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 1be7055..0dc64e6 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -275,7 +275,7 @@ void mmc_start_bkops(struct mmc_card *card, bool from_exception)
>
> BUG_ON(!card);
>
> - if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card))
> + if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
> return;
>
> err = mmc_read_bkops_status(card);
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 1fc48a2..c35bf6e 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -483,10 +483,12 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
> /* check whether the eMMC card supports 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];
> + card->ext_csd.man_bkops_en =
> + (ext_csd[EXT_CSD_BKOPS_EN] &
> + EXT_CSD_MANUAL_BKOPS_MASK);
> card->ext_csd.raw_bkops_status =
> ext_csd[EXT_CSD_BKOPS_STATUS];
> - if (!card->ext_csd.bkops_en)
> + if (!card->ext_csd.man_bkops_en)
> pr_info("%s: BKOPS_EN bit is not set\n",
> mmc_hostname(card->host));
> }
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 4d69c00..15772d0 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -83,7 +83,10 @@ struct mmc_ext_csd {
> bool hpi; /* HPI support bit */
> unsigned int hpi_cmd; /* cmd used as HPI */
> bool bkops; /* background support bit */
> - bool bkops_en; /* background enable bit */
> + bool man_bkops_en; /* manual background
> + enable bit */
> + bool auto_bkops_en; /* automatic background
> + enable bit */
> unsigned int data_sector_size; /* 512 bytes or 4KB */
> unsigned int data_tag_unit_size; /* DATA TAG UNIT size */
> unsigned int boot_ro_lock; /* ro lock support */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index fb97b5c..d39db3e 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -428,6 +428,12 @@ struct _mmc_csd {
> #define EXT_CSD_BKOPS_LEVEL_2 0x2
>
> /*
> + * BKOPS modes
> + */
> +#define EXT_CSD_MANUAL_BKOPS_MASK 0x01
> +#define EXT_CSD_AUTOMATIC_BKOPS_MASK 0x02
> +
> +/*
> * MMC_SWITCH access modes
> */
>
>
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