DWCMSHC_AT_STAT
sdhci_writew(host, i, priv->vendor_specific_area1 + DWCMSHC_AT_STAT);
sdhci_writew(host, 0, priv->vendor_specific_area1 + DWCMSHC_AT_STAT);
sdhci_writew(host, phase_code, priv->vendor_specific_area1 + DWCMSHC_AT_STAT);
sdhci_writew(host, 0, priv->vendor_specific_area1 + DWCMSHC_AT_STAT);