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| author | Romain Izard <romain.izard.pro@gmail.com> | 2013-06-14 14:25:44 +0200 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-07-05 12:46:30 -0400 |
| commit | 7c4f10ac5a940b3994be7f1801a606f8605e7a69 (patch) | |
| tree | d2f33df6104fcf38497abc245e942c535a67a37e /drivers/mmc | |
| parent | d7a985e08fe84307430090b8604f5652080cc930 (diff) | |
| download | linux-7c4f10ac5a940b3994be7f1801a606f8605e7a69.tar.gz linux-7c4f10ac5a940b3994be7f1801a606f8605e7a69.tar.bz2 linux-7c4f10ac5a940b3994be7f1801a606f8605e7a69.zip | |
mmc: core: production year for eMMC 4.41 and later
The field containing the production date in the CID register only uses
4 bits to encode the year, starting from 1997 in the original standard.
In 2013, the production year field contains 0, and the kernel reports a
1997 production date.
The eMMC 4.51 specification adds a new interpretation rule. For all
devices implementing the 4.41 specification or later, the production
year field will be interpreted as a value between 2010 and 2025, with
0 corresponding to 2013.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -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 e5ed79eb8e3d..6d02012a1d0b 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -482,6 +482,10 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } if (card->ext_csd.rev >= 5) { + /* Adjust production date as per JEDEC JESD84-B451 */ + if (card->cid.year < 2010) + card->cid.year += 16; + /* check whether the eMMC card supports BKOPS */ if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) { card->ext_csd.bkops = 1; |