On 3 June 2016 at 18:08, Gwendal Grignou <gwendal@xxxxxxxxxxxx> wrote:
> If available, eMMC stack uses HC_ERASE_GRP_SIZE as erase size.
> The perfererred erase size may need to be bigger to ensure discard
> operations are not too slow.
> Some high capacity eMMC (64MB) reports erase size to 512kB, resulting in
> long discard time.
> Calculate prefeerred erase size based on eMMC size.
>
> Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
Thanks, applied for next! I did update the changelog as well as the
comment in the code.
Please next time, try to work a bit more on the changelog. It really
helps when reviewing to understand what the change is all about.
Kind regards
Uffe
> ---
> v2: fix comments
> v3: rereading the patch, we should not compare to hc_erase_size again,
> it has already been set properly in the caller function.
>
> drivers/mmc/core/core.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index ef76b1c..bd881a0 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -1987,17 +1987,17 @@ void mmc_init_erase(struct mmc_card *card)
> * to that size and alignment.
> *
> * For SD cards that define Allocation Unit size, limit erases to one
> - * Allocation Unit at a time. For MMC cards that define High Capacity
> - * Erase Size, whether it is switched on or not, limit to that size.
> - * Otherwise just have a stab at a good value. For modern cards it
> - * will end up being 4MiB. Note that if the value is too small, it
> - * can end up taking longer to erase.
> + * Allocation Unit at a time.
> + * For MMC, have a stab at a good value. For modern cards it
> + * will end up being 4MiB.
> + * Note that if the value is too small, it can end up taking longer to
> + * erase.
> + * erase_size is already set to High Capacity Erase Size if available
> + * when this function is called.
> */
> if (mmc_card_sd(card) && card->ssr.au) {
> card->pref_erase = card->ssr.au;
> card->erase_shift = ffs(card->ssr.au) - 1;
> - } else if (card->ext_csd.hc_erase_size) {
> - card->pref_erase = card->ext_csd.hc_erase_size;
> } else if (card->erase_size) {
> sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
> if (sz < 128)
> --
> 2.8.0.rc3.226.g39d4020
>
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