[PATCH v3 4/9] drm/mediatek: Add gamma support different lut_size for other SoC

[kernel test robot]

Hi Jason-JH.Lin",

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20220909]
[also build test WARNING on v6.0-rc4]
[cannot apply to drm-misc/drm-misc-next robh/for-next drm/drm-next linus/master v6.0-rc4 v6.0-rc3 v6.0-rc2]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jason-JH-Lin/Add-gamma-lut-support-for-mt8195/20220911-233949
base:    9a82ccda91ed2b40619cb3c10d446ae1f97bab6e
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20220912/202209120412.a3tFZuO9-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/1d5b909c49fd62f1e6055fd3d077b9c5fae53e00
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jason-JH-Lin/Add-gamma-lut-support-for-mt8195/20220911-233949
        git checkout 1d5b909c49fd62f1e6055fd3d077b9c5fae53e00
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/mediatek/mtk_disp_gamma.c:59:14: warning: no previous prototype for 'mtk_gamma_get_size' [-Wmissing-prototypes]
      59 | unsigned int mtk_gamma_get_size(struct device *dev)
         |              ^~~~~~~~~~~~~~~~~~


vim +/mtk_gamma_get_size +59 drivers/gpu/drm/mediatek/mtk_disp_gamma.c

    58	
  > 59	unsigned int mtk_gamma_get_size(struct device *dev)
    60	{
    61		struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
    62		unsigned int lut_size = LUT_SIZE_DEFAULT;
    63	
    64		if (gamma && gamma->data)
    65			lut_size = gamma->data->lut_size;
    66	
    67		return lut_size;
    68	}
    69	

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