SDHCI_POWER_CONTROL
RD1(slot, SDHCI_POWER_CONTROL), RD1(slot, SDHCI_BLOCK_GAP_CONTROL));
WR1(slot, SDHCI_POWER_CONTROL, pwr);
WR1(slot, SDHCI_POWER_CONTROL, pwr);
WR1(slot, SDHCI_POWER_CONTROL, pwr);