DW_MMC_CARD_PRESENT
if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
if (present && !test_and_set_bit(DW_MMC_CARD_PRESENT, &slot->flags))
!test_and_clear_bit(DW_MMC_CARD_PRESENT, &slot->flags))