Hi Kevin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20210423]
[cannot apply to robh/for-next linus/master v5.12-rc8 v5.12-rc7 v5.12-rc6 v5.12-rc8]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Kevin-Tang/Add-Unisoc-s-drm-kms-module/20210425-203751
base:    e3d35712f85ac84fb06234848f6c043ab418cf8b
config: mips-allyesconfig (attached as .config)
compiler: mips-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://github.com/0day-ci/linux/commit/38d063b6aa337e18ececc6ca3bce6451bf703b13
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Kevin-Tang/Add-Unisoc-s-drm-kms-module/20210425-203751
        git checkout 38d063b6aa337e18ececc6ca3bce6451bf703b13
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=mips 

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

All errors (new ones prefixed by >>):

>> make[5]: *** No rule to make target 'drivers/gpu/drm/sprd/dw_dsi_ctrl.o', needed by 'drivers/gpu/drm/sprd/built-in.a'.
>> make[5]: *** No rule to make target 'drivers/gpu/drm/sprd/dw_dsi_ctrl_ppi.o', needed by 'drivers/gpu/drm/sprd/built-in.a'.
   make[5]: Target '__build' not remade because of errors.

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