diff options
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/sd.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 781c1e24308c..4646b7a03db6 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -857,11 +857,13 @@ try_again: return err; /* - * In case CCS and S18A in the response is set, start Signal Voltage - * Switch procedure. SPI mode doesn't support CMD11. + * In case the S18A bit is set in the response, let's start the signal + * voltage switch procedure. SPI mode doesn't support CMD11. + * Note that, according to the spec, the S18A bit is not valid unless + * the CCS bit is set as well. We deliberately deviate from the spec in + * regards to this, which allows UHS-I to be supported for SDSC cards. */ - if (!mmc_host_is_spi(host) && rocr && - ((*rocr & 0x41000000) == 0x41000000)) { + if (!mmc_host_is_spi(host) && rocr && (*rocr & 0x01000000)) { err = mmc_set_uhs_voltage(host, pocr); if (err == -EAGAIN) { retries--; |