PCH_DPLL
u32 temp = I915_READ(PCH_DPLL(i));
val = I915_READ(PCH_DPLL(id));
I915_WRITE(PCH_DPLL(id), pll->state.hw_state.dpll);
POSTING_READ(PCH_DPLL(id));
I915_WRITE(PCH_DPLL(id), pll->state.hw_state.dpll);
POSTING_READ(PCH_DPLL(id));
I915_WRITE(PCH_DPLL(id), 0);
POSTING_READ(PCH_DPLL(id));