PIXCLK_GATE
intel_de_write(display, PIXCLK_GATE, PIXCLK_GATE_GATE);
intel_de_write(display, PIXCLK_GATE, PIXCLK_GATE_UNGATE);
if ((intel_de_read(display, PIXCLK_GATE) & PIXCLK_GATE_UNGATE) == 0)
MMIO_D(PIXCLK_GATE);