[U-Boot] [PATCH ] MMC: fix user capacity for partitioned eMMC card

Markus Niebel
2014-11-18T14:11:42Z

From: Markus Niebel <Markus.Niebel@tq-group.com>

if the card claims to be high capacity and the card
is partitioned the capacity shall still be read from
ext_csd SEC_COUNT even if the resulting capacity is
smaller than 2 GiB

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
---
drivers/mmc/mmc.c | 15 +++++++++++++++
include/mmc.h | 3 +++
2 files changed, 18 insertions(+)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 44a4feb..24b0989 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1022,6 +1022,21 @@ static int mmc_startup(struct mmc *mmc)
mmc->erase_grp_size =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] *
MMC_MAX_BLOCK_LEN * 1024;
+ /*
+ * if high capacity and partition setting completed
+ * SEC_COUNT is valid even if it is smaller than 2 GiB
+ * JEDEC Standard JESD84-B45, 6.2.4
+ */
+ if (mmc->high_capacity &&
+ (ext_csd[EXT_CSD_PARTITION_SETTING] &
+ EXT_CSD_PARTITION_SETTING_COMPLETED)) {
+ capacity = (ext_csd[EXT_CSD_SEC_CNT]) |
+ (ext_csd[EXT_CSD_SEC_CNT + 1] << 8) |
+ (ext_csd[EXT_CSD_SEC_CNT + 2] << 16) |
+ (ext_csd[EXT_CSD_SEC_CNT + 3] << 24);
+ capacity *= MMC_MAX_BLOCK_LEN;
+ mmc->capacity_user = capacity;
+ }
} else {
/* Calculate the group size from the csd value. */
int erase_gsz, erase_gmul;
diff --git a/include/mmc.h b/include/mmc.h
index d74a190..cb91565 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -147,6 +147,7 @@
* EXT_CSD fields
*/
#define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
+#define EXT_CSD_PARTITION_SETTING 155 /* R/W */
#define EXT_CSD_PARTITIONS_ATTRIBUTE 156 /* R/W */
#define EXT_CSD_PARTITIONING_SUPPORT 160 /* RO */
#define EXT_CSD_RST_N_FUNCTION 162 /* R/W */
@@ -197,6 +198,8 @@
#define EXT_CSD_BOOT_BUS_WIDTH_RESET(x) (x << 2)
#define EXT_CSD_BOOT_BUS_WIDTH_WIDTH(x) (x)

+#define EXT_CSD_PARTITION_SETTING_COMPLETED (1 << 0)
+
#define R1_ILLEGAL_COMMAND (1 << 22)
#define R1_APP_CMD (1 << 5)

--
2.1.1