MG_PLL_DIV1
m1 = I915_READ(MG_PLL_DIV1(port)) & MG_PLL_DIV1_FBPREDIV_MASK;
hw_state->mg_pll_div1 = I915_READ(MG_PLL_DIV1(port));
I915_WRITE(MG_PLL_DIV1(port), hw_state->mg_pll_div1);