[PATCH] mmc: mmc.c check if mmc cards < 2GB do sector addressing

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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 <prakity@xxxxxxxxxxx>
---
 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 6396c5d..6c5d3d4 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -421,6 +421,7 @@ 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);
@@ -434,7 +435,7 @@ 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;
 
@@ -522,6 +523,13 @@ 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


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