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mmc: core: Add quirk for incorrect manufacturing date

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Some eMMC vendors need to report manufacturing dates beyond 2025 but are
reluctant to update the EXT_CSD revision from 8 to 9. Changing the
Updating the EXT_CSD revision may involve additional testing or
qualification steps with customers. To ease this transition and avoid a
full re-qualification process, a workaround is needed. This
patch introduces a temporary quirk that re-purposes the year codes
corresponding to 2010, 2011, and 2012 to represent the years 2026, 2027,
and 2028, respectively. This solution is only valid for this three-year
period.

After 2028, vendors must update their firmware to set EXT_CSD_REV=9 to
continue reporting the correct manufacturing date in compliance with the
JEDEC standard.

The `MMC_QUIRK_BROKEN_MDT` is introduced and enabled for all Sandisk
devices to handle this behavior.

Signed-off-by: Avri Altman <avri.altman@sandisk.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Avri Altman 2025-11-28 07:20:11 +02:00 committed by Ulf Hansson
parent 3e487a634b
commit 263ff314cc
4 changed files with 15 additions and 0 deletions
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6
drivers/mmc/core/card.h
View File

@ -89,6 +89,7 @@ struct mmc_fixup {
#define CID_MANFID_MICRON 0x13
#define CID_MANFID_SAMSUNG 0x15
#define CID_MANFID_APACER 0x27
#define CID_MANFID_SANDISK_MMC 0x45
#define CID_MANFID_SWISSBIT 0x5D
#define CID_MANFID_KINGSTON 0x70
#define CID_MANFID_HYNIX 0x90
@ -305,4 +306,9 @@ static inline int mmc_card_no_uhs_ddr50_tuning(const struct mmc_card *c)
return c->quirks & MMC_QUIRK_NO_UHS_DDR50_TUNING;
}
static inline int mmc_card_broken_mdt(const struct mmc_card *c)
{
return c->quirks & MMC_QUIRK_BROKEN_MDT;
}
#endif

5
drivers/mmc/core/mmc.c
View File

@ -676,6 +676,11 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
/* Adjust production date as per JEDEC JESD84-B51B September 2025 */
if (card->cid.year < 2023)
card->cid.year += 16;
} else {
/* Handle vendors with broken MDT reporting */
if (mmc_card_broken_mdt(card) && card->cid.year >= 2010 &&
card->cid.year <= 2012)
card->cid.year += 16;
}
}

3
drivers/mmc/core/quirks.h
View File

@ -170,6 +170,9 @@ static const struct mmc_fixup __maybe_unused mmc_ext_csd_fixups[] = {
MMC_FIXUP_EXT_CSD_REV(CID_NAME_ANY, CID_MANFID_NUMONYX,
0x014e, add_quirk, MMC_QUIRK_BROKEN_HPI, 6),
MMC_FIXUP(CID_NAME_ANY, CID_MANFID_SANDISK_MMC, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_BROKEN_MDT),
END_FIXUP
};

1
include/linux/mmc/card.h
View File

@ -329,6 +329,7 @@ struct mmc_card {
#define MMC_QUIRK_BROKEN_CACHE_FLUSH (1<<16) /* Don't flush cache until the write has occurred */
#define MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY (1<<17) /* Disable broken SD poweroff notify support */
#define MMC_QUIRK_NO_UHS_DDR50_TUNING (1<<18) /* Disable DDR50 tuning */
#define MMC_QUIRK_BROKEN_MDT (1<<19) /* Wrong manufacturing year */
bool written_flag; /* Indicates eMMC has been written since power on */
bool reenable_cmdq; /* Re-enable Command Queue */