I got a Micron eMMC 4.41 memory and I am trying to use the TRIM function.
my EXT_CSD_TRIM_MULT is 15 which gets me a tmo of 15*300=4500 ms
Then in mmc_calc_max_discard() I have:
max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
if (mmc_can_trim(card)) {
max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
if (max_trim < max_discard)
max_discard = max_trim;
} else if (max_discard < card->erase_size) {
max_discard = 0;
}
pr_debug("%s: calculated max. discard sectors %u for timeout %u
ms\n",
mmc_hostname(host), max_discard, host->max_busy_timeout);
Now mmc_do_calc_max_discard(card, MMC_TRIM_ARG) returns 0 because the
initial trim
timeout is so high, 4500 ms:
mmc0: calculated max. discard sectors 0 for timeout 2684 ms
How is this supposed to work?
Jocke
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