From 5278d3d1c6df0cf616db1c7d956bae9b7460d3a3 Mon Sep 17 00:00:00 2001 From: Romain Izard Date: Fri, 14 Jun 2013 14:25:44 +0200 Subject: [PATCH] mmc: core: production year for eMMC 4.41 and later The field containing the production date in the CID register only uses 4 bits to encode the year, starting from 1997 in the original standard. In 2013, the production year field contains 0, and the kernel reports a 1997 production date. The eMMC 4.51 specification adds a new interpretation rule. For all devices implementing the 4.41 specification or later, the production year field will be interpreted as a value between 2010 and 2025, with 0 corresponding to 2013. Signed-off-by: Romain Izard Signed-off-by: Chris Ball --- drivers/mmc/core/mmc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index e5ed79eb8e3d..6d02012a1d0b 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -482,6 +482,10 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } if (card->ext_csd.rev >= 5) { + /* Adjust production date as per JEDEC JESD84-B451 */ + if (card->cid.year < 2010) + card->cid.year += 16; + /* check whether the eMMC card supports BKOPS */ if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) { card->ext_csd.bkops = 1; -- 2.39.5