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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>
This commit is contained in:
Romain Izard 2014-06-27 10:51:07 +02:00 committed by Ulf Hansson
parent 4e743f1fc8
commit 03a59437ef
1 changed files with 5 additions and 6 deletions
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11
drivers/mmc/core/mmc.c
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@ -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];