diff options
| author | Romain Izard <romain.izard.pro@gmail.com> | 2014-06-27 10:51:07 +0200 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2017-11-29 15:01:51 +0100 |
| commit | 09418f875a5b1d4a1f0a7dfb0d36d0ae90de1b20 (patch) | |
| tree | eda02545ac444153976c602856280affc0c57978 | |
| parent | 2eecc3c4c63955c3d5860b44422dccd229ec7043 (diff) | |
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>
(cherry picked from commit 03a59437ef6b6ad7fb0165cb9b96c08d6bf057fc)
| -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 3e1cabd21919..6eb9a4ddcee8 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -293,13 +293,12 @@ 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 > 8) { - 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]; |