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mmc: subtract boot sectors from disk size for eMMC 4.3+ devices

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the csd sector count reported by eMMC 4.3+ cards includes the boot
partition size; subtract this from the size reported to the disk
since the boot partition is inaccessible

Change-Id: I601b83aa0159b7aa446409ea8c945b256dd0b5b1
Signed-off-by: Gary King <gking@nvidia.com>
This commit is contained in:
Gary King 2010-07-15 17:11:32 -07:00 committed by Colin Cross
parent 057ac3a83f
commit f0b0e4bec1
2 changed files with 7 additions and 1 deletions
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7
drivers/mmc/core/mmc.c
View File

@ -253,8 +253,13 @@ static int mmc_read_ext_csd(struct mmc_card *card)
ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
/* Cards with density > 2GiB are sector addressed */
if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512) {
unsigned boot_sectors;
/* size is in 256K chunks, i.e. 512 sectors each */
boot_sectors = ext_csd[EXT_CSD_BOOT_SIZE_MULTI] * 512;
card->ext_csd.sectors -= boot_sectors;
mmc_card_set_blockaddr(card);
}
}
switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {

1
include/linux/mmc/mmc.h
View File

@ -266,6 +266,7 @@ struct _mmc_csd {
#define EXT_CSD_SEC_ERASE_MULT 230 /* RO */
#define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */
#define EXT_CSD_TRIM_MULT 232 /* RO */
#define EXT_CSD_BOOT_SIZE_MULTI 226 /* RO */
/*
* EXT_CSD field definitions