From 037dc0ab5dff36984d97735987dff01a7ec73893 Mon Sep 17 00:00:00 2001 From: Diego Santa Cruz Date: Tue, 23 Dec 2014 10:50:25 +0100 Subject: [PATCH] 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 ++++++ include/mmc.h | 1 + 2 files changed, 7 insertions(+) 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); diff --git a/include/mmc.h b/include/mmc.h index 6c8bbfc952..bcaf9f012f 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -316,6 +316,7 @@ struct mmc { uint read_bl_len; uint write_bl_len; uint erase_grp_size; /* in 512-byte sectors */ + uint hc_wp_grp_size; /* in 512-byte sectors */ u64 capacity; u64 capacity_user; u64 capacity_boot; -- 2.25.1