From d7b2912991bb18db26b6c6b51cdc637142e21d3e Mon Sep 17 00:00:00 2001 From: Markus Niebel Date: Tue, 18 Nov 2014 15:11:42 +0100 Subject: MMC: fix user capacity for partitioned eMMC card if the card claims to be high capacity and the card is partitioned the capacity shall still be read from ext_csd SEC_COUNT even if the resulting capacity is smaller than 2 GiB Signed-off-by: Markus Niebel Acked-by: Jaehoon Chung --- drivers/mmc/mmc.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'drivers/mmc') diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 9dc924c..4a8cf65 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1022,6 +1022,21 @@ static int mmc_startup(struct mmc *mmc) mmc->erase_grp_size = ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] * MMC_MAX_BLOCK_LEN * 1024; + /* + * if high capacity and partition setting completed + * SEC_COUNT is valid even if it is smaller than 2 GiB + * JEDEC Standard JESD84-B45, 6.2.4 + */ + if (mmc->high_capacity && + (ext_csd[EXT_CSD_PARTITION_SETTING] & + EXT_CSD_PARTITION_SETTING_COMPLETED)) { + capacity = (ext_csd[EXT_CSD_SEC_CNT]) | + (ext_csd[EXT_CSD_SEC_CNT + 1] << 8) | + (ext_csd[EXT_CSD_SEC_CNT + 2] << 16) | + (ext_csd[EXT_CSD_SEC_CNT + 3] << 24); + capacity *= MMC_MAX_BLOCK_LEN; + mmc->capacity_user = capacity; + } } else { /* Calculate the group size from the csd value. */ int erase_gsz, erase_gmul; -- cgit v1.1