diff options
| author | Philip Rakity <prakity@marvell.com> | 2011-02-13 23:13:09 -0800 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-03-16 12:30:25 -0400 |
| commit | b676f0391a5f6816c047cbd1e2ad2a897f3c161a (patch) | |
| tree | e054461c7796123904f57fe4969134e94c2eb8ec /drivers | |
| parent | 2f94e55ae5ddad83e661002985d2ea11b6d51d3d (diff) | |
| download | linux-b676f0391a5f6816c047cbd1e2ad2a897f3c161a.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 6396c5d98e85..14e95f39a7bf 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 +523,15 @@ 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 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); } |