mmc: check if mmc cards < 2GB do sector addressing
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@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 6396c5d..14e95f3 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -421,6 +421,7 @@
int err, ddr = 0;
u32 cid[4];
unsigned int max_dtr;
+ u32 rocr;
BUG_ON(!host);
WARN_ON(!host->claimed);
@@ -434,7 +435,7 @@
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 +523,15 @@
err = mmc_read_ext_csd(card);
if (err)
goto free_card;
+
+ /* If doing byte addressing, check if required to do sector
+ * addressing. Handle the case of <2GB cards 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);
}