diff options
| -rw-r--r-- | drivers/mmc/mmc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 21665ec..98abf1c 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -785,6 +785,16 @@ retry_scr: if (!(__be32_to_cpu(switch_status[3]) & SD_HIGHSPEED_SUPPORTED)) return 0; + /* + * If the host doesn't support SD_HIGHSPEED, do not switch card to + * HIGHSPEED mode even if the card support SD_HIGHSPPED. + * This can avoid furthur problem when the card runs in different + * mode between the host. + */ + if (!((mmc->host_caps & MMC_MODE_HS_52MHz) && + (mmc->host_caps & MMC_MODE_HS))) + return 0; + err = sd_switch(mmc, SD_SWITCH_SWITCH, 0, 1, (u8 *)switch_status); if (err) |