On 07/17/2012 09:30 PM, Adrian Hunter wrote:
> On 17/07/12 05:44, Jaehoon Chung wrote:
>
> <snip>
>
>> +/**
>> + * 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))
>> + return;
>> +
>> + if (mmc_is_exception_event(card, EXT_CSD_URGENT_BKOPS))
>> + if (card->ext_csd.raw_bkops_status)
>> + mmc_card_set_need_bkops(card);
>> +
>> + /*
>> + * If card is already doing bkops or need for
>> + * bkops flag is not set, then do nothing just
>> + * return
>> + */
>> + if (mmc_card_doing_bkops(card) || !mmc_card_need_bkops(card))
>> + return;
>> +
>> + mmc_claim_host(card->host);
>> + if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
>> + timeout = MMC_BKOPS_MAX_TIMEOUT;
>> + use_busy_signal = 0;
>> + } else {
>> + timeout = 0;
>> + use_busy_signal = 1;
>> + }
>
> Is this the right way around?
use the mmc_switch() with R1B..
this case is no problem, because after sending bkops, repeat the checking card status until prg-done.
But, at sdhci controller, be occurred data timeout error.
Because response type is r1b, and timeout value is too large.
(Actually, i think that is controller's problem..but just its my test environment.)
if other sdhci controller working well with R1b, use_busy_signal need not.
Just use the mmc_switch().
But When running bkops level2/3 use with R1 type, also no problem.
Because the also checking status in mmc_switch() until prg-done.
Best Regards,
Jaehoon Chung
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