[PATCH 7.0.y 2/3] mmc: core: Add quirk for incorrect manufacturing date

Sasha Levin
2026-05-05T10:02:56Z

From: Avri Altman <avri.altman@sandisk.com>

[ Upstream commit 263ff314cc5602599d481b0912a381555fcbad28 ]

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>
Stable-dep-of: d6bf2e64dec8 ("mmc: core: Optimize time for secure erase/trim for some Kingston eMMCs")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/mmc/core/card.h | 6 ++++++
drivers/mmc/core/mmc.c | 5 +++++
drivers/mmc/core/quirks.h | 3 +++
include/linux/mmc/card.h | 1 +
4 files changed, 15 insertions(+)

diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
index 1200951bab08c..a9619dd452708 100644
--- a/drivers/mmc/core/card.h
+++ b/drivers/mmc/core/card.h
@@ -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
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index f744dd5018428..8846550a8892a 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -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;
}
}

diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
index c417ed34c0576..f5e8a0f6d11b9 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -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
};

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index e9e964c20e530..4722dd7e46ce1 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -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 */