On Apr 13, 2012, at 7:39 AM, Namjae Jeon wrote:
> Hi. Venkatraman.
>
> You fixed 10 times. why is it 10 times ?
> and checking err from mmc_send_status is not needed ? is it also
> infinite case ?
>
> Thanks.
>
> 2012/4/13 Venkatraman S <[email protected]>:
>> Try to send HPI only a fixed number of times till it is
>> successful. One successful transfer is enough - but wait
>> till the card comes out of transfer state.
>> Return an error if the card was not in programming state to
>> begin with - so that the caller knows that HPI was not sent.
>>
>> Reported-by: Alex Lemberg <[email protected]>
>> Signed-off-by: Venkatraman S <[email protected]>
>> ---
>> drivers/mmc/core/core.c | 34 ++++++++++++++++++----------------
>> 1 file changed, 18 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>> index e541efb..ceabef5 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -401,7 +401,7 @@ EXPORT_SYMBOL(mmc_wait_for_req);
>> */
>> int mmc_interrupt_hpi(struct mmc_card *card)
>> {
>> - int err;
>> + int err, i;
>> u32 status;
>>
>> BUG_ON(!card);
>> @@ -421,27 +421,29 @@ int mmc_interrupt_hpi(struct mmc_card *card)
>> /*
>> * If the card status is in PRG-state, we can send the HPI command.
>> */
>> + err = -EINVAL;
>> if (R1_CURRENT_STATE(status) == R1_STATE_PRG) {
>> - do {
>> - /*
>> - * We don't know when the HPI command will finish
>> - * processing, so we need to resend HPI until out
>> - * of prg-state, and keep checking the card status
>> - * with SEND_STATUS. If a timeout error occurs when
>> - * sending the HPI command, we are already out of
>> - * prg-state.
>> - */
>> + /* To prevent an infinite lockout, try to send HPI
>> + * a fixed number of times and bailout if it can't
>> + * succeed.
>> + */
>> + for (i = 0; i < 10 && err != 0 ; i++)
would it make more sense to check time as well as retry count ?
worry that count may be too short or behavior is dependent on card manufacturer.
>> err = mmc_send_hpi_cmd(card, &status);
>> - if (err)
>> + /* Once HPI was sent successfully, the card is
>> + * supposed to be back to transfer state.
>> + */
>> + do {
>> + if (err) {
>> pr_debug("%s: abort HPI (%d error)\n",
>> mmc_hostname(card->host), err);
>> -
>> - err = mmc_send_status(card, &status);
>> - if (err)
>> break;
>> + }
>> + err = mmc_send_status(card, &status);
>> } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
>> - } else
>> - pr_debug("%s: Left prg-state\n", mmc_hostname(card->host));
>> + } else {
>> + pr_debug("%s: Can't send HPI. State=%d\n",
>> + mmc_hostname(card->host), R1_CURRENT_STATE(status));
>> + }
>>
>> out:
>> mmc_release_host(card->host);
>> --
>> 1.7.10.rc2
>>
>> --
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