diff options
| author | Kyungmin Park <kyungmin.park@samsung.com> | 2011-10-18 00:34:04 (GMT) |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-10-26 20:32:27 (GMT) |
| commit | b3bf915308ca2b50f3beec6cc824083870f0f4b5 (patch) | |
| tree | 955978242b333e1388358b4b50b5f8f4a5abca04 /drivers/mmc/core/mmc.c | |
| parent | d9ddd62943ee07a75d0428ffcf52f1a747a28c39 (diff) | |
| download | linux-fsl-qoriq-b3bf915308ca2b50f3beec6cc824083870f0f4b5.tar.xz | |
mmc: core: new discard feature support at eMMC v4.5
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 <kyungmin.park@samsung.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index f8ea938..5408876 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -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; |