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mmc: read the high capacity WP group size for eMMC

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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 <Diego.SantaCruz@spinetix.com>
This commit is contained in:
Diego Santa Cruz
2014-12-23 10:50:25 +01:00
committed by Pantelis Antoniou
parent a4ff9f83f5
commit 037dc0ab5d
2 changed files with 7 additions and 0 deletions
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6
drivers/mmc/mmc.c
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@@ -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);