Hanumath,
There is one other case we came across were sector addressing for mmc cards is
required.
I don't know if you have seen this case but the patch is below.
Philip
Some TOSHIBA MMC cards only support sector addressing
even though the size is < 2GB. According to JEDEC
Spec JESD84-A441-1 the ocr register (bits 30, 29)
determine byte/sector mode. Use them.
Signed-off-by: Philip Rakity <prak...@marvell.com>
---
drivers/mmc/core/mmc.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index c139a5e..9303a57 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -378,6 +378,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
int err, ddr = 0;
u32 cid[4];
unsigned int max_dtr;
+ u32 rocr;
BUG_ON(!host);
WARN_ON(!host->claimed);
@@ -391,7 +392,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
mmc_go_idle(host);
/* The extra bit indicates that we support high capacity */
- err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
+ err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
if (err)
goto err;
@@ -479,6 +480,13 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
err = mmc_read_ext_csd(card);
if (err)
goto free_card;
+
+ /* if doing byte addressing check if required to do sector */
+ /* addressing. Handle case of cards < 2GB needing sector */
+ /* addressing. See section 8.1 JEDEC Standard JED84-A441 */
+ /* ocr register has bit 30 set for sector addressing */
+ if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
+ mmc_card_set_blockaddr(card);
/* Erase size depends on CSD and Extended CSD */
mmc_set_erase_size(card);
}
--
1.7.0.4
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
