diff options
Diffstat (limited to 'drivers/mmc/core/sd.c')
| -rw-r--r-- | drivers/mmc/core/sd.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 5b7c99855635..6970b82171f7 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -452,6 +452,66 @@ static int sd_select_driver_type(struct mmc_card *card, u8 *status) return 0; } +static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) +{ + unsigned int bus_speed = 0, timing = 0; + int err; + + /* + * If the host doesn't support any of the UHS-I modes, fallback on + * default speed. + */ + if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) + return 0; + + if ((card->host->caps & MMC_CAP_UHS_SDR104) && + (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { + bus_speed = UHS_SDR104_BUS_SPEED; + timing = MMC_TIMING_UHS_SDR104; + card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; + } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && + (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { + bus_speed = UHS_DDR50_BUS_SPEED; + timing = MMC_TIMING_UHS_DDR50; + card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; + } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | + MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & + SD_MODE_UHS_SDR50)) { + bus_speed = UHS_SDR50_BUS_SPEED; + timing = MMC_TIMING_UHS_SDR50; + card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; + } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && + (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { + bus_speed = UHS_SDR25_BUS_SPEED; + timing = MMC_TIMING_UHS_SDR25; + card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; + } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | + MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & + SD_MODE_UHS_SDR12)) { + bus_speed = UHS_SDR12_BUS_SPEED; + timing = MMC_TIMING_UHS_SDR12; + card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; + } + + card->sd_bus_speed = bus_speed; + err = mmc_sd_switch(card, 1, 0, bus_speed, status); + if (err) + return err; + + if ((status[16] & 0xF) != bus_speed) + printk(KERN_WARNING "%s: Problem setting bus speed mode!\n", + mmc_hostname(card->host)); + else { + mmc_set_timing(card->host, timing); + mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); + } + + return 0; +} + /* * UHS-I specific initialization procedure */ @@ -485,6 +545,11 @@ static int mmc_sd_init_uhs_card(struct mmc_card *card) /* Set the driver strength for the card */ err = sd_select_driver_type(card, status); + if (err) + goto out; + + /* Set bus speed mode of the card */ + err = sd_set_bus_speed_mode(card, status); out: kfree(status); |
