CHV_PLL_DW3
dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port), dpio_val);
pll_dw3 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));