rcar_du_crtc.c:undefined reference to `rcar_lvds_clk_enable'

[kernel test robot]

Hi Masahiro,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5695e51619745d4fe3ec2506a2f0cd982c5e27a4
commit: def2fbffe62c00c330c7f41584a356001179c59c kconfig: allow symbols implied by y to become m
date:   12 months ago
config: arm64-randconfig-r006-20210228 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=def2fbffe62c00c330c7f41584a356001179c59c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout def2fbffe62c00c330c7f41584a356001179c59c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   aarch64-linux-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_enable':
>> rcar_du_crtc.c:(.text+0x1ba0): undefined reference to `rcar_lvds_clk_enable'
   aarch64-linux-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_disable':
>> rcar_du_crtc.c:(.text+0x23b0): undefined reference to `rcar_lvds_clk_disable'
   aarch64-linux-ld: drivers/gpu/drm/rcar-du/rcar_du_drv.o: in function `rcar_du_init':
   rcar_du_drv.c:(.init.text+0x10): undefined reference to `rcar_du_of_init'
   aarch64-linux-ld: drivers/gpu/drm/rcar-du/rcar_du_encoder.o: in function `rcar_du_encoder_init':
   rcar_du_encoder.c:(.text+0x230): undefined reference to `rcar_lvds_dual_link'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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