CHV_PLL_DW3
tmp = vlv_dpio_read(display->drm, phy, CHV_PLL_DW3(ch));
vlv_dpio_write(display->drm, phy, CHV_PLL_DW3(ch), tmp);
pll_dw3 = vlv_dpio_read(display->drm, phy, CHV_PLL_DW3(ch));