From 037dc0ab5dff36984d97735987dff01a7ec73893 Mon Sep 17 00:00:00 2001 From: Diego Santa Cruz Date: Tue, 23 Dec 2014 10:50:25 +0100 Subject: mmc: read the high capacity WP group size for eMMC Read the eMMC high capacity write protect group size at mmc device initialization. This is useful to correctly partition an eMMC device, as partitions need to be aligned to this size. Signed-off-by: Diego Santa Cruz --- drivers/mmc/mmc.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers') diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index be211016cf..16a7a90398 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1065,7 +1065,9 @@ static int mmc_startup(struct mmc *mmc) return err; else ext_csd[EXT_CSD_ERASE_GROUP_DEF] = 1; + } + if (ext_csd[EXT_CSD_ERASE_GROUP_DEF] & 0x01) { /* Read out group size from ext_csd */ mmc->erase_grp_size = ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] * 1024; @@ -1092,6 +1094,10 @@ static int mmc_startup(struct mmc *mmc) mmc->erase_grp_size = (erase_gsz + 1) * (erase_gmul + 1); } + + mmc->hc_wp_grp_size = 1024 + * ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] + * ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; } err = mmc_set_capacity(mmc, mmc->part_num); -- cgit v1.2.1