mmc: subtract boot sectors from disk size for eMMC 4.3+ devices
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>
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 2a7e43b..868f511 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -274,8 +274,13 @@
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) {
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index ac26a68..630ea24 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -283,6 +283,7 @@
#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