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mmc: core: new discard feature support at eMMC v4.5

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MMC v4.5 supports the DISCARD feature (CMD38).  It's different from
trim and there's no check bit.  Currently it's only supported at v4.5.

Signed-off-by: Kyungmin Park <[email protected]>
Signed-off-by: Jaehoon Chung <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Kyungmin Park 2011-10-18 09:34:04 +09:00 • committed by Chris Ball
commit b3bf915308
5 changed files with 26 additions and 1 deletions
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4
drivers/mmc/card/block.c
View file

@ -756,7 +756,9 @@ static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
from = blk_rq_pos(req);
nr = blk_rq_sectors(req);
if (mmc_can_trim(card))
if (mmc_can_discard(card))
arg = MMC_DISCARD_ARG;
else if (mmc_can_trim(card))
arg = MMC_TRIM_ARG;
else
arg = MMC_ERASE_ARG;

14
drivers/mmc/core/core.c
View file

@ -1709,10 +1709,24 @@ int mmc_can_trim(struct mmc_card *card)
{
if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
return 1;
if (mmc_can_discard(card))
return 1;
return 0;
}
EXPORT_SYMBOL(mmc_can_trim);
int mmc_can_discard(struct mmc_card *card)
{
/*
* As there's no way to detect the discard support bit at v4.5
* use the s/w feature support filed.
*/
if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
return 1;
return 0;
}
EXPORT_SYMBOL(mmc_can_discard);
int mmc_can_sanitize(struct mmc_card *card)
{
if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)

4
drivers/mmc/core/mmc.c
View file

@ -452,6 +452,10 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
}
/* eMMC v4.5 or later */
if (card->ext_csd.rev >= 6)
card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
card->erased_byte = 0xFF;