mmc: Reliable write support.

Allows reliable writes to be used for MMC writes. Reliable writes are used
to service write REQ_FUA/REQ_META requests. Handles both the legacy and
the enhanced reliable write support in MMC cards.

Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 5c611a6e008..ae6b8fd3880 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -300,6 +300,8 @@ static int mmc_read_ext_csd(struct mmc_card *card)
                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
                 card->ext_csd.hc_erase_size =
                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
+
+                card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
         }
 
         if (card->ext_csd.rev >= 4) {
@@ -351,6 +353,9 @@ static int mmc_read_ext_csd(struct mmc_card *card)
                         ext_csd[EXT_CSD_TRIM_MULT];
         }
 
+        if (card->ext_csd.rev >= 5)
+                card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
+
         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
                 card->erased_byte = 0xFF;
         else