mmc: Allow forward compatibility for eMMC (03a59437) · Commits · 戴 / test

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>

drivers/mmc/core/mmc.c

+5 −6

Original line number	Diff line number	Diff line
		@@ -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];

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