mmc: Ensure linux starts in eMMC user partition

uBoot sometimes leaves eMMC pointing to the private boot partition.
Ensure we always start looking at the user partition.

Signed-off-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Bruce Clemens <bpclemens@marvell.com>
Signed-off-by: Mark F. Brown <markb@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

3 files changed, 12 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 772d0d0a541b..5c611a6e0080 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -288,6 +288,7 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 
         if (card->ext_csd.rev >= 3) {
                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
+                card->ext_csd.bootconfig = ext_csd[EXT_CSD_BOOT_CONFIG];
 
                 /* Sleep / awake timeout in 100ns units */
                 if (sa_shift > 0 && sa_shift <= 0x17)
@@ -568,6 +569,15 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
         }
 
         /*
+         * Ensure eMMC user default partition is enabled
+         */
+        if (card->ext_csd.bootconfig & 0x7) {
+                card->ext_csd.bootconfig &= ~0x7;
+                mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_CONFIG,
+                           card->ext_csd.bootconfig);
+        }
+
+        /*
          * Activate high speed (if supported)
          */
         if ((card->ext_csd.hs_max_dtr != 0) &&
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index adb4888248be..557b73263390 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -45,6 +45,7 @@ struct mmc_ext_csd {
         u8                      rev;
         u8                      erase_group_def;
         u8                      sec_feature_support;
+        u8                      bootconfig;
         unsigned int            sa_timeout;             /* Units: 100ns */
         unsigned int            hs_max_dtr;
         unsigned int            sectors;
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 264ba5451e3b..b5ec88fd1352 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -256,6 +256,7 @@ struct _mmc_csd {
 #define EXT_CSD_PARTITION_ATTRIBUTE     156     /* R/W */
 #define EXT_CSD_PARTITION_SUPPORT       160     /* RO */
 #define EXT_CSD_ERASE_GROUP_DEF         175     /* R/W */
+#define EXT_CSD_BOOT_CONFIG             179     /* R/W */
 #define EXT_CSD_ERASED_MEM_CONT         181     /* RO */
 #define EXT_CSD_BUS_WIDTH               183     /* R/W */
 #define EXT_CSD_HS_TIMING               185     /* R/W */