LINFLEXD_LINIER_DRIE
writel(ier & ~LINFLEXD_LINIER_DRIE, port->membase + LINIER);
ier &= ~(LINFLEXD_LINIER_DRIE | LINFLEXD_LINIER_DTIE);
ier |= LINFLEXD_LINIER_DRIE;
ier &= ~(LINFLEXD_LINIER_DRIE | LINFLEXD_LINIER_DTIE);