[frank-w-bpi-r2-4.14:7.4-rc 39/154] drivers/net/pcs/pcs-mtk-usxgmii.c:387:undefined reference to `mtk_xfi_tphy_valid_ctle'

[frank-w-bpi-r2-4.14:7.4-rc 39/154] drivers/net/pcs/pcs-mtk-usxgmii.c:387:undefined reference to `mtk_xfi_tphy_valid_ctle'

[kernel test robot]

tree:   https://github.com/frank-w/BPI-R2-4.14 7.4-rc
head:   674a64f97be4d25967f31216ffe7eaefdabf827f
commit: 9a052b8df8d2bc4bf7dd144f34dc9aa7d60f0b6b [39/154] net: pcs: mtk-usxgmii: check link status and phy ctle before reset
config: s390-randconfig-2005-20261108 (https://download.01.org/0day-ci/archive/20261108/202611080743.15a4qqfE-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 13.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261108/202611080743.15a4qqfE-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202611080743.15a4qqfE-lkp@intel.com/

All errors (new ones prefixed by >>):

   s390-linux-ld: drivers/net/pcs/pcs-mtk-usxgmii.o: in function `mtk_usxgmii_pcs_link_up':
>> drivers/net/pcs/pcs-mtk-usxgmii.c:387:(.text+0xc3a): undefined reference to `mtk_xfi_tphy_valid_ctle'


vim +387 drivers/net/pcs/pcs-mtk-usxgmii.c

   376	
   377	static void mtk_usxgmii_pcs_link_up(struct phylink_pcs *pcs, unsigned int neg_mode,
   378					    phy_interface_t interface,
   379					    int speed, int duplex)
   380	{
   381		struct mtk_usxgmii_pcs *mpcs = pcs_to_mtk_usxgmii_pcs(pcs);
   382	
   383		/* Reconfiguring USXGMII to ensure the quality of the RX signal
   384		 * after the line side link up.
   385		 */
   386		if (mtk_usxgmii_pcs_link_status(mpcs) &&
 > 387		    mtk_xfi_tphy_valid_ctle(mpcs->xfi_tphy))
   388			return;
   389	
   390		mtk_usxgmii_pcs_config(pcs, neg_mode, interface, NULL, false);
   391		phy_reset(mpcs->xfi_tphy);
   392		phy_set_mode_ext(mpcs->xfi_tphy, PHY_MODE_ETHERNET, interface);
   393	}
   394	

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https://github.com/intel/lkp-tests/wiki