diff options
Diffstat (limited to 'drivers/mmc/core/sd.c')
| -rw-r--r-- | drivers/mmc/core/sd.c | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 6dac89fe0535..b0cd285d272a 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -403,6 +403,7 @@ struct device_type sd_type = { int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) { int err; + u32 rocr; /* * Since we're changing the OCR value, we seem to @@ -420,12 +421,38 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) */ err = mmc_send_if_cond(host, ocr); if (!err) - ocr |= 1 << 30; + ocr |= SD_OCR_CCS; - err = mmc_send_app_op_cond(host, ocr, NULL); + /* + * If the host supports one of UHS-I modes, request the card + * to switch to 1.8V signaling level. + */ + if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) + ocr |= SD_OCR_S18R; + + /* If the host can supply more than 150mA, XPC should be set to 1. */ + if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | + MMC_CAP_SET_XPC_180)) + ocr |= SD_OCR_XPC; + +try_again: + err = mmc_send_app_op_cond(host, ocr, &rocr); if (err) return err; + /* + * In case CCS and S18A in the response is set, start Signal Voltage + * Switch procedure. SPI mode doesn't support CMD11. + */ + if (!mmc_host_is_spi(host) && ((rocr & 0x41000000) == 0x41000000)) { + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180); + if (err) { + ocr &= ~SD_OCR_S18R; + goto try_again; + } + } + if (mmc_host_is_spi(host)) err = mmc_send_cid(host, cid); else @@ -773,6 +800,11 @@ int mmc_attach_sd(struct mmc_host *host) BUG_ON(!host); WARN_ON(!host->claimed); + /* Make sure we are at 3.3V signalling voltage */ + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330); + if (err) + return err; + err = mmc_send_app_op_cond(host, 0, &ocr); if (err) return err; |