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
>
> --
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