diff options
Diffstat (limited to 'drivers/mmc/core/core.c')
| -rw-r--r-- | drivers/mmc/core/core.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 79ba3a5bbf17..d97dff5fab62 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1537,8 +1537,13 @@ void mmc_power_up(struct mmc_host *host, u32 ocr) host->ios.timing = MMC_TIMING_LEGACY; mmc_set_ios(host); - /* Set signal voltage to 3.3V */ - __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330); + /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */ + if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0) + dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n"); + else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0) + dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n"); + else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0) + dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n"); /* * This delay should be sufficient to allow the power supply |