Commit 6c689886 authored by Baolin Wang's avatar Baolin Wang Committed by Ulf Hansson

mmc: core: Optimize the mmc erase size alignment

In most cases the 'card->erase_size' is power of 2, then the round_up/down()
function is more efficient than '%' operation when the 'card->erase_size' is
power of 2.
Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Tested-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 71085123
......@@ -2212,6 +2212,23 @@ static unsigned int mmc_align_erase_size(struct mmc_card *card,
{
unsigned int from_new = *from, nr_new = nr, rem;
/*
* When the 'card->erase_size' is power of 2, we can use round_up/down()
* to align the erase size efficiently.
*/
if (is_power_of_2(card->erase_size)) {
unsigned int temp = from_new;
from_new = round_up(temp, card->erase_size);
rem = from_new - temp;
if (nr_new > rem)
nr_new -= rem;
else
return 0;
nr_new = round_down(nr_new, card->erase_size);
} else {
rem = from_new % card->erase_size;
if (rem) {
rem = card->erase_size - rem;
......@@ -2225,6 +2242,7 @@ static unsigned int mmc_align_erase_size(struct mmc_card *card,
rem = nr_new % card->erase_size;
if (rem)
nr_new -= rem;
}
if (nr_new == 0)
return 0;
......
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