diff options
| author | Romain Izard <romain.izard.pro@gmail.com> | 2014-06-27 10:51:07 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2014-07-09 11:26:11 +0200 |
| commit | 03a59437ef6b6ad7fb0165cb9b96c08d6bf057fc (patch) | |
| tree | 8a2dd4de1661e2ef7b4eb6f9985416d7f5f581d3 /drivers/mmc/core | |
| parent | 4e743f1fc8bd24d1bc185e4d7b13f7b74c9c5423 (diff) | |
| download | blackbird-op-linux-03a59437ef6b6ad7fb0165cb9b96c08d6bf057fc.tar.gz blackbird-op-linux-03a59437ef6b6ad7fb0165cb9b96c08d6bf057fc.zip | |
mmc: Allow forward compatibility for eMMC
As stated by the eMMC 5.0 specification, a chip should not be rejected
only because of the revision stated in the EXT_CSD_REV field of the
EXT_CSD register.
Remove the control on this value, the control of the CSD_STRUCTURE field
should be sufficient to reject future incompatible changes.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/core')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 793c6f7ddb04..1eda8dd8c867 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -324,13 +324,12 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } } + /* + * The EXT_CSD format is meant to be forward compatible. As long + * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV + * are authorized, see JEDEC JESD84-B50 section B.8. + */ card->ext_csd.rev = ext_csd[EXT_CSD_REV]; - if (card->ext_csd.rev > 7) { - pr_err("%s: unrecognised EXT_CSD revision %d\n", - mmc_hostname(card->host), card->ext_csd.rev); - err = -EINVAL; - goto out; - } card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0]; card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1]; |
