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authorJarkko Lavinen <jarkko.lavinen@nokia.com>2008-11-17 14:35:21 +0200
committerPierre Ossman <drzeus@drzeus.cx>2008-12-31 18:18:12 +0100
commitb30f8af3358b5c66be223e3a9f3d11b3d02b4a8f (patch)
tree937cf3024bdb48da748c8fece5cfaa6f6ef45744 /drivers/mmc/core
parent35ff8554d12ecc80a46ea0d9bce34fe28733ff38 (diff)
mmc: Add 8-bit bus width support
Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/core')
-rw-r--r--drivers/mmc/core/mmc.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index fdd7c760be8..c232d11a7ed 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -434,13 +434,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
* Activate wide bus (if supported).
*/
if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
- (host->caps & MMC_CAP_4_BIT_DATA)) {
+ (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
+ unsigned ext_csd_bit, bus_width;
+
+ if (host->caps & MMC_CAP_8_BIT_DATA) {
+ ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
+ bus_width = MMC_BUS_WIDTH_8;
+ } else {
+ ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
+ bus_width = MMC_BUS_WIDTH_4;
+ }
+
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
+ EXT_CSD_BUS_WIDTH, ext_csd_bit);
+
if (err)
goto free_card;
- mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+ mmc_set_bus_width(card->host, bus_width);
}
if (!oldcard)
@@ -624,4 +635,3 @@ err:
return err;
}
-