PUNIT_REG_PWRGT_CTRL
ctrl = vlv_punit_read(display->drm, PUNIT_REG_PWRGT_CTRL);
vlv_punit_write(display->drm, PUNIT_REG_PWRGT_CTRL, ctrl);
vlv_punit_read(display->drm, PUNIT_REG_PWRGT_CTRL));
ctrl = vlv_punit_read(display->drm, PUNIT_REG_PWRGT_CTRL) & mask;