Symbol: CHV_CMN_DW28
drivers/gpu/drm/i915/display/intel_display_power_well.c
1538
tmp = vlv_dpio_read(display, phy, CHV_CMN_DW28);
drivers/gpu/drm/i915/display/intel_display_power_well.c
1541
vlv_dpio_write(display, phy, CHV_CMN_DW28, tmp);