On 28 January 2015 at 21:54, Ulf Hansson <[email protected]> wrote:
> On 27 January 2015 at 15:01, Alexey Skidanov
> <[email protected]> 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.
>>
>> Signed-off-by: Alexey Skidanov <[email protected]>
One more thing. Please update the commit message header, since I don't
think you are fixing a bug. You are fixing a compatibility issue due
to a version of the spec, let's state that instead.
Kind regards
Uffe
>> ---
>> 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",
>
> Should we maybe update the pr_info to say "MAN_BKOPS_EN bit is not set"?
>
>> 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 */
>
> Please remove "auto_bkops_en", since it's not used. If see a need for
> it later, then we can add it.
>
>> 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
>
> Please remove EXT_CSD_AUTOMATIC_BKOPS_MASK, it's not used in this patch.
>
>> +
>> +/*
>> * MMC_SWITCH access modes
>> */
>>
>> --
>> 1.7.9.5
>>
>
> Kind regards
> Uffe
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