PUNIT_REG_DDR_SETUP2
val = vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2);
vlv_punit_write(display->drm, PUNIT_REG_DDR_SETUP2, val);
ret = poll_timeout_us(val = vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2),
val = vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2);
vlv_punit_write(display->drm, PUNIT_REG_DDR_SETUP2, val);
ret = poll_timeout_us(val = vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2),
val = vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2);