On 07/18/2012 04:34 AM, me...@codeaurora.org wrote:
> See my comments below.
>
>> +/**
>> + * mmc_start_bkops - start BKOPS for supported cards
>> + * @card: MMC card to start BKOPS
>> + *
>> + * Start background operations whenever requested.
>> + * when the urgent BKOPS bit is set in a R1 command response
>> + * then background operations should be started immediately.
>> +*/
>> +void mmc_start_bkops(struct mmc_card *card)
>> +{
>> + int err;
>> + int timeout;
>> + u8 use_busy_signal;
>> +
>> + BUG_ON(!card);
>> + if (!card->ext_csd.bkops_en || !(card->host->caps2 & MMC_CAP2_BKOPS))
>
> Can you please explain why we need to have MMC_CAP2_BKOPS in addition to
> card->ext_csd.bkops_en?
We can remove the MMC_CAP2_BKOPS. but if someone didn't want to use the bkops
feature,
then can control with that capability.
>
> + return;
>> +
>> + if (mmc_is_exception_event(card, EXT_CSD_URGENT_BKOPS))
>> + if (card->ext_csd.raw_bkops_status)
>> + mmc_card_set_need_bkops(card);
>
> I think we can remove the bkops need flag. You can just return here in
> case it is not needed instead of updating the flag and checking it in the
> next line.
Right..it can remove..i will remove.
>
>
>> @@ -354,6 +422,20 @@ struct mmc_async_req *mmc_start_req(struct mmc_host
> *host,
>> if (host->areq) {
>> mmc_wait_for_req_done(host, host->areq->mrq);
>> err = host->areq->err_check(host->card, host->areq);
>> + /*
>> + * Check BKOPS urgency from each R1 response
>> + */
>> + if (host->card && mmc_card_mmc(host->card) &&
>> + ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
>> + (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
>> + (host->areq->mrq->cmd->resp[0] & R1_EXP_EVENT))
>> + mmc_start_bkops(host->card);
>> + /*
>> + * If areq exsit,
>> + * we stop the bkops for foreground operation
>> + */
>> + if (areq && mmc_card_doing_bkops(host->card))
>> + err = mmc_stop_bkops(host->card);
>
> I think that mmc_start_bkops should handle only level 2 and 3 for now.
> Since it is not likely to have an exception with level 1 on, the best way
> to deal with it is inside mmc_start_bkops (starting the BKOPs for levels 2
> and 3).
> When the periodiv BKOPs will be added, then level 1 will be fully
> supported. In such a case mmc_start_bkops should know to start BKOPs on
> level 1 only if it is called due to the periodic delayed work (for
> example, by adding a flag to mmc_start_bkops)
>
>> +int mmc_stop_bkops(struct mmc_card *card)
>> +{
>> + int err = 0;
>> +
>> + BUG_ON(!card);
>> + err = mmc_interrupt_hpi(card);
>> +
>> + /*
>> + * if err is EINVAL, it's status that can't issue HPI.
>> + * Maybe it should be completed the BKOPS.
>
> should complete
>
>> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> index 4ad994a..baf90e0 100644
>> --- a/drivers/mmc/core/mmc_ops.c
>> +++ b/drivers/mmc/core/mmc_ops.c
>> @@ -368,18 +368,19 @@ int mmc_spi_set_crc(struct mmc_host *host, int
> use_crc)
>> }
>>
>> /**
>> - * mmc_switch - modify EXT_CSD register
>> + * __mmc_switch - modify EXT_CSD register
>> * @card: the MMC card associated with the data transfer
>> * @set: cmd set values
>> * @index: EXT_CSD register index
>> * @value: value to program into EXT_CSD register
>> * @timeout_ms: timeout (ms) for operation performed by register write,
> * timeout of zero implies maximum possible timeout
>> + * @wait_for_prod_done: is waiting for program done
>
> Change the comment for the new parameter: use_busy_signal
Will fix
>
>> *
>> * Modifies the EXT_CSD register for selected card.
>> */
>> -int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, -
> unsigned int timeout_ms)
>> +int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, +
> unsigned int timeout_ms, u8 use_busy_signal)
>
> Use bool instead of u8
Will change
>
>> {
>> int err;
>> struct mmc_command cmd = {0};
>> @@ -393,13 +394,24 @@ int mmc_switch(struct mmc_card *card, u8 set, u8
> index, u8 value,
>> (index << 16) |
>> (value << 8) |
>> set;
>> - cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
>> +
>> + cmd.flags = MMC_CMD_AC;
>> + if (use_busy_signal)
>> + cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
>> + else
>> + cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
>> +
>> cmd.cmd_timeout_ms = timeout_ms;
>>
>> err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
>> if (err)
>> return err;
>>
>> + /* No need to check card status in case of BKOPS LEVEL2 switch*/
>
> have a space before the */
>
>> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index
> cdfbc3c..b9e11aa 100644
>> --- a/include/linux/mmc/card.h
>> +++ b/include/linux/mmc/card.h
>> @@ -79,10 +79,13 @@ struct mmc_ext_csd {
>> bool hpi_en; /* HPI enablebit */
>> bool hpi; /* HPI support bit */
>> unsigned int hpi_cmd; /* cmd used as HPI */
>> + bool bkops; /* background support bit */
>> + bool bkops_en; /* 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 */
>> bool boot_ro_lockable;
>> + u8 raw_exception_status; /* 53 */
>> u8 raw_partition_support; /* 160 */
>> u8 raw_erased_mem_count; /* 181 */
>> u8 raw_ext_csd_structure; /* 194 */
>> @@ -96,6 +99,7 @@ struct mmc_ext_csd {
>> u8 raw_sec_erase_mult; /* 230 */
>> u8 raw_sec_feature_support;/* 231 */
>> u8 raw_trim_mult; /* 232 */
>> + u8 raw_bkops_status; /* 246 */
>> u8 raw_sectors[4]; /* 212 - 4 bytes */
>>
>> unsigned int feature_support;
>> @@ -229,6 +233,9 @@ struct mmc_card {
>> #define MMC_CARD_REMOVED (1<<7) /* card has been removed */
>> #define MMC_STATE_HIGHSPEED_200 (1<<8) /* card is in HS200
>> mode */
> #define MMC_STATE_SLEEP (1<<9) /* card is in sleep
> state */
>> +#define MMC_STATE_NEED_BKOPS (1<<10) /* card need to do
>> BKOPS */
> +#define MMC_STATE_DOING_BKOPS (1<<11) /* card is doing BKOPS
> */
> +#define MMC_STATE_CHECK_BKOPS (1<<12) /* card need to check
> BKOPS */
>
> MMC_STATE_CHECK_BKOPS is not used, can be removed
>
>> @@ -400,6 +407,9 @@ static inline void __maybe_unused
> remove_quirk(struct
>> mmc_card *card, int data)
>> #define mmc_card_ext_capacity(c) ((c)->state & MMC_CARD_SDXC)
>> #define mmc_card_removed(c) ((c) && ((c)->state & MMC_CARD_REMOVED))
> #define mmc_card_is_sleep(c) ((c)->state & MMC_STATE_SLEEP)
>> +#define mmc_card_need_bkops(c) ((c)->state & MMC_STATE_NEED_BKOPS)
> This flag can also be removed
> +#define mmc_card_doing_bkops(c) ((c)->state & MMC_STATE_DOING_BKOPS)
> +#define mmc_card_check_bkops(c) ((c)->state & MMC_STATE_CHECK_BKOPS)
>
> mmc_card_check_bkops is not used, can be removed
>
>>
>> #define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
> #define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
>> @@ -412,7 +422,13 @@ static inline void __maybe_unused
> remove_quirk(struct
>> mmc_card *card, int data)
>> #define mmc_card_set_ext_capacity(c) ((c)->state |= MMC_CARD_SDXC)
> #define mmc_card_set_removed(c) ((c)->state |= MMC_CARD_REMOVED)
> #define mmc_card_set_sleep(c) ((c)->state |= MMC_STATE_SLEEP)
>> +#define mmc_card_set_need_bkops(c) ((c)->state |= MMC_STATE_NEED_BKOPS)
> +#define mmc_card_set_doing_bkops(c) ((c)->state |=
> MMC_STATE_DOING_BKOPS)
>> +#define mmc_card_set_check_bkops(c) ((c)->state |=
> MMC_STATE_CHECK_BKOPS)
>
> mmc_card_set_check_bkops can be removed
>
>>
>> +#define mmc_card_clr_need_bkops(c) ((c)->state &=
> ~MMC_STATE_NEED_BKOPS)
>> +#define mmc_card_clr_doing_bkops(c) ((c)->state &=
>> ~MMC_STATE_DOING_BKOPS)
>> +#define mmc_card_clr_check_bkops(c) ((c)->state &=
>> ~MMC_STATE_CHECK_BKOPS)
>
> mmc_card_clr_check_bkops can be removed
>
> Thanks,
> Maya
>
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