On 17/07/12 15:58, Jaehoon Chung wrote:
> 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.
You added:
+ /*
+ * For urgent bkops status (LEVEL_2 and more)
+ * bkops executed synchronously, otherwise
+ * the operation is in progress
+ */
+ if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
+ mmc_card_set_doing_bkops(card);
But:
status < 2 => use_busy_signal = 1
use_busy_signal = 1 => waiting
waiting => the operation is NOT in progress
Hence my question: Is this the right way around?
Also this change is needed for the addition of 'use_busy_signal' to
mmc_switch:
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index baf90e0..e202a5e 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -417,7 +417,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index,
u8 value,
err = mmc_send_status(card, &status);
if (err)
return err;
- if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
+ if (use_busy_signal && (card->host->caps &
MMC_CAP_WAIT_WHILE_BUSY))
break;
if (mmc_host_is_spi(card->host))
break;
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