The OEMID is an 8-bit binary number that identifies the Device OEM and/or the Device contents (when used as a distribution media either on ROM or FLASH Devices). It occupies bits [111:104] in the CID register: see the eMMC spec JESD84-B51 paragraph 7.2.3. So it is 8 bits, and has been so since ever - this bug is so ancients I couldn't even find its source. The furthest I could go is to commit 335eadf2ef6a (sd: initialize SD cards) but its already was wrong. Could be because in SD its indeed 16 bits (a 2-characters ASCII string). It is important to fix it because we are using it as one of our quirk's token, as well as other tools, e.g. the LVFS (https://github.com/fwupd/fwupd/). Signed-off-by: Avri Altman <avri.altman@xxxxxxx> --- drivers/mmc/core/mmc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 89cd48fcec79..4a4bab9aa726 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -104,7 +104,7 @@ static int mmc_decode_cid(struct mmc_card *card) case 3: /* MMC v3.1 - v3.3 */ case 4: /* MMC v4 */ card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); - card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); + card->cid.oemid = UNSTUFF_BITS(resp, 104, 8); card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); -- 2.42.0
