O2_SD_CAPS
ret = pci_read_config_dword(chip->pdev, O2_SD_CAPS, &scratch_32);
pci_write_config_dword(chip->pdev, O2_SD_CAPS, scratch_32);
ret = pci_read_config_byte(chip->pdev, O2_SD_CAPS, &scratch);
pci_write_config_byte(chip->pdev, O2_SD_CAPS, scratch);
pci_write_config_byte(chip->pdev, O2_SD_CAPS, 0x73);