DPLL_CTRL2
val = I915_READ(DPLL_CTRL2);
I915_WRITE(DPLL_CTRL2, val);
I915_WRITE(DPLL_CTRL2, I915_READ(DPLL_CTRL2) |
temp = I915_READ(DPLL_CTRL2) & DPLL_CTRL2_DDI_CLK_SEL_MASK(port);