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Thu, 27 Nov 2025 21:20:37 -0800 (PST) From: Avri Altman X-Google-Original-From: Avri Altman To: Ulf Hansson , linux-mmc@vger.kernel.org Cc: Avri Altman , Shawn Lin Subject: [PATCH v2 1/2] mmc: core: Adjust MDT beyond 2025 Date: Fri, 28 Nov 2025 07:20:10 +0200 Message-Id: <20251128052011.204735-2-avri.altman@sandisk.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251128052011.204735-1-avri.altman@sandisk.com> References: <20251128052011.204735-1-avri.altman@sandisk.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit JEDEC JESD84-B51B which was released in September 2025, increases the manufacturing year limit for eMMC devices. The eMMC manufacturing year is stored in a 4-bit field in the CID register. Originally, it covered 1997–2012. Later, with EXT_CSD_REV=8, it was extended up to 2025. Now, with EXT_CSD_REV=9, the range is rolled over by another 16 years, up to 2038. The mapping is as follows: cid[8..11] | rev ≤ 4 | 8 ≥ rev > 4 | rev > 8 --------------------------------------------- 0 | 1997 | 2013 | 2029 1 | 1998 | 2014 | 2030 2 | 1999 | 2015 | 2031 3 | 2000 | 2016 | 2032 4 | 2001 | 2017 | 2033 5 | 2002 | 2018 | 2034 6 | 2003 | 2019 | 2035 7 | 2004 | 2020 | 2036 8 | 2005 | 2021 | 2037 9 | 2006 | 2022 | 2038 10 | 2007 | 2023 | 11 | 2008 | 2024 | 12 | 2009 | 2025 | 13 | 2010 | | 2026 14 | 2011 | | 2027 15 | 2012 | | 2028 Signed-off-by: Avri Altman Reviewed-by: Shawn Lin --- drivers/mmc/core/mmc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 7c86efb1044a..f744dd501842 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -671,7 +671,14 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) card->ext_csd.enhanced_rpmb_supported = (card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR); + + if (card->ext_csd.rev >= 9) { + /* Adjust production date as per JEDEC JESD84-B51B September 2025 */ + if (card->cid.year < 2023) + card->cid.year += 16; + } } + out: return err; } -- 2.34.1