Actually, Specfication is described to be misunderstood easily. Nice day. 2012/3/29 Dong, Chuanxiao <chuanxiao.dong@xxxxxxxxx>: > >> -----Original Message----- >> From: Namjae Jeon [mailto:linkinjeon@xxxxxxxxx] >> Sent: Thursday, March 29, 2012 11:30 AM >> To: Dong, Chuanxiao >> Cc: linux-mmc@xxxxxxxxxxxxxxx; cjb@xxxxxxxxxx; Hunter, Adrian >> Subject: Re: [Patch v1]mmc:core: correct mmc_erase_timeout calculation >> >> I think that write block delay * SECURE_ERASE_MULT is right in case of secure >> erase + ERASE_GROUP_DEF disable. > Thanks Namjae, seems I misunderstand the meaning of "Erase Timeout". It just means a timeout value for erase operation. > >> >> See the specification contents on 4.4.1. >> Erase / Secure Erase >> The duration of an erase command will be (order of magnitude) the number of >> Erase blocks to be erased multiplied by the block write delay. If ERASE_GROUP_DEF >> (EXT_CSD byte >> [175]) is enabled, >> ERASE_TIMEOUT_MULT should be used to calculate the duration. >> Secure Erase timeout is calculated based on the Erase Timeout and additional >> SEC_ERASE_MULT factor (EXT_CSD byte [230]). >> >> Thanks. >> >> 2012/3/29 Dong, Chuanxiao <chuanxiao.dong@xxxxxxxxx>: >> >> -----Original Message----- >> >> From: Namjae Jeon [mailto:linkinjeon@xxxxxxxxx] >> >> Sent: Wednesday, March 28, 2012 8:36 PM >> >> To: Dong, Chuanxiao >> >> Cc: linux-mmc@xxxxxxxxxxxxxxx; cjb@xxxxxxxxxx; Hunter, Adrian >> >> Subject: Re: [Patch v1]mmc:core: correct mmc_erase_timeout >> >> calculation >> >> >> >> If ERASE_GROUP_DEF is disable with secure erase, erase timeout is >> >> calculated with 300ms * ERASE_TIMEOUT_MULT. Is it right ? >> > >> > My understanding about the JESD84-A441 is different with current >> mmc_mmc_erase_timeout implemented. From the EXT_CSD[230], seems no >> matter ERASE_GROUP_DEF is enabled or not, secure erase timeout is calculated as >> 300ms * ERASE_TIMEOUT_MULT * SECURE_ERASE_MULT. That is why I submitted >> this patch. >> > >> > Does someone else can correct me if my understanding about the erase timeout >> calculation is wrong? >> > >> > Thanks >> > Chuanxiao >> > >> >> >> >> Thanks. >> >> >> >> 2012/3/28 Dong, Chuanxiao <chuanxiao.dong@xxxxxxxxx>: >> >> > What I am checking with is eMMC4.41 spec, not eMMC4.5 spec. >> >> > Forward you the link: >> >> > www.jedec.org/sites/default/files/docs/JESD84-A441.pdf >> >> > >> >> > Thanks >> >> > Chuanxiao >> >> > >> >> >> -----Original Message----- >> >> >> From: Namjae Jeon [mailto:linkinjeon@xxxxxxxxx] >> >> >> Sent: Wednesday, March 28, 2012 5:17 PM >> >> >> To: Dong, Chuanxiao >> >> >> Cc: linux-mmc@xxxxxxxxxxxxxxx; cjb@xxxxxxxxxx; Hunter, Adrian >> >> >> Subject: Re: [Patch v1]mmc:core: correct mmc_erase_timeout >> >> >> calculation >> >> >> >> >> >> Hi. Chuanxiao. >> >> >> Would you share your specification with me ? >> >> >> When I check the latest emmc 4.5 spec, I can not find it. >> >> >> Thanks. >> >> >> >> >> >> 2012/3/28 Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx>: >> >> >> > According to JEDEC 7.8.2, mmc_erase_timeout calculation should be >> follow: >> >> >> > 1. Secure erase timeout = 300ms * ERASE_TIMEOUT_MULT * >> >> >> > SEC_ERASE_MULT 2. Secure trim timeout = 300ms * >> >> >> > ERASE_TIMEOUT_MULT * >> >> SEC_TRIM_MULT 3. >> >> >> > Trim timeout = 300ms * TRIM_MULT 4. Erase timeout: >> >> >> > a. if ERASE_GROUP_DEF is true: Erase timeout = 300ms * >> >> >> > ERASE_TIMEOUT_MULT >> >> >> > b. if ERASE_GROUP_DEF is false: Erase timeout = write block >> >> >> > delay >> >> >> > >> >> >> > Signed-off-by: Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx> >> >> >> > --- >> >> >> > drivers/mmc/core/core.c | 42 >> >> >> > +++++++++++++++++++++++++++++------------- >> >> >> > 1 files changed, 29 insertions(+), 13 deletions(-) >> >> >> > >> >> >> > diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c >> >> >> > index 14f262e..d9d6d1c 100644 >> >> >> > --- a/drivers/mmc/core/core.c >> >> >> > +++ b/drivers/mmc/core/core.c >> >> >> > @@ -1405,12 +1405,36 @@ static unsigned int >> >> >> > mmc_mmc_erase_timeout(struct mmc_card *card, >> >> >> > { >> >> >> > unsigned int erase_timeout; >> >> >> > >> >> >> > - if (card->ext_csd.erase_group_def & 1) { >> >> >> > - /* High Capacity Erase Group Size uses HC >> >> >> > timeouts */ >> >> >> > - if (arg == MMC_TRIM_ARG) >> >> >> > - erase_timeout = >> >> >> > card->ext_csd.trim_timeout; >> >> >> > + /* >> >> >> > + * JEDEC 7.8.2 >> >> >> > + * >> >> >> > + * 1. Secure erase/trim timeout is calculated absed on >> >> >> > + Erase Timeout >> >> >> > + * and additional SEC_ERASE_MULT/SEC_TRIM_MULT. >> >> >> > + * So secure erase/trim timeout = ERASE Timeout * >> >> >> > + SEC_ERASE_MULT/ >> >> >> > + * SEC_TRIM_MULT. >> >> >> > + * ERASE Timeout = 300ms * ERASE_TIMEOUT_MULT >> >> >> > + * >> >> >> > + * 2. trim timeout is calculated based on the TRIM_MULT factor. >> >> >> > + * So trim timeout = 300ms * TRIM_MULT >> >> >> > + * >> >> >> > + * 3. erase timeout calculation: >> >> >> > + * a. if ERASE_GROUP_DEF is enabled, >> >> >> > + ERASE_TIMEOUT_MULT should be >> >> >> > + * used to calculate erase timeout, so: >> >> >> > + * erase timeout = 300 * ERASE_TIMEOUT_MULT >> >> >> > + * b. if ERASE_GROUP_DEF is diabled, the duration >> >> >> > + of an erase >> >> >> > + * command will be the number of Erase blocks to be >> >> >> > + erased >> >> >> > + * multiplied by the block write delay. >> >> >> > + */ >> >> >> > + if (arg & MMC_SECURE_ARGS) { >> >> >> > + erase_timeout = card->ext_csd.hc_erase_timeout; >> >> >> > + if (arg == MMC_SECURE_ERASE_ARG) >> >> >> > + erase_timeout *= >> >> >> > + card->ext_csd.sec_erase_mult; >> >> >> > else >> >> >> > - erase_timeout = >> >> >> > card->ext_csd.hc_erase_timeout; >> >> >> > + erase_timeout *= >> >> >> > + card->ext_csd.sec_trim_mult; >> >> >> > + } else if (arg & MMC_TRIM_ARGS) { >> >> >> > + erase_timeout = card->ext_csd.trim_timeout; >> >> >> > + } else if (card->ext_csd.erase_group_def & 1) { >> >> >> > + erase_timeout = card->ext_csd.hc_erase_timeout; >> >> >> > } else { >> >> >> > /* CSD Erase Group Size uses write timeout */ >> >> >> > unsigned int mult = (10 << card->csd.r2w_factor); >> >> >> > @@ >> >> >> > -1441,14 +1465,6 @@ static unsigned int >> >> >> > mmc_mmc_erase_timeout(struct mmc_card *card, >> >> >> > erase_timeout = 1; >> >> >> > } >> >> >> > >> >> >> > - /* Multiplier for secure operations */ >> >> >> > - if (arg & MMC_SECURE_ARGS) { >> >> >> > - if (arg == MMC_SECURE_ERASE_ARG) >> >> >> > - erase_timeout *= >> >> >> > card->ext_csd.sec_erase_mult; >> >> >> > - else >> >> >> > - erase_timeout *= >> >> >> > card->ext_csd.sec_trim_mult; >> >> >> > - } >> >> >> > - >> >> >> > erase_timeout *= qty; >> >> >> > >> >> >> > /* >> >> >> > -- >> >> >> > 1.7.1 >> >> >> > >> >> >> > -- >> >> >> > To unsubscribe from this list: send the line "unsubscribe linux-mmc" >> >> >> > in the body of a message to majordomo@xxxxxxxxxxxxxxx More >> >> >> > majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
