[PATCH 06/11] drm/mediatek: gamma: Use bitfield macros

[kernel test robot]

Hi AngeloGioacchino,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.3 next-20230428]
[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/AngeloGioacchino-Del-Regno/drm-mediatek-gamma-Adjust-mtk_drm_gamma_set_common-parameters/20230502-161758
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230502081650.25947-7-angelogioacchino.delregno%40collabora.com
patch subject: [PATCH 06/11] drm/mediatek: gamma: Use bitfield macros
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20230503/202305030043.iaNtiOtW-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/171ab0605a0c2b44167dc1339b29dc80c2ac7d4d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review AngeloGioacchino-Del-Regno/drm-mediatek-gamma-Adjust-mtk_drm_gamma_set_common-parameters/20230502-161758
        git checkout 171ab0605a0c2b44167dc1339b29dc80c2ac7d4d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305030043.iaNtiOtW-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/gpu/drm/mediatek/mtk_disp_gamma.c: In function 'mtk_gamma_set_common':
>> drivers/gpu/drm/mediatek/mtk_disp_gamma.c:111:32: error: implicit declaration of function 'FIELD_PREP' [-Werror=implicit-function-declaration]
     111 |                         word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, hwlut.red);
         |                                ^~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/FIELD_PREP +111 drivers/gpu/drm/mediatek/mtk_disp_gamma.c

    77	
    78	void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crtc_state *state)
    79	{
    80		struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
    81		unsigned int i;
    82		struct drm_color_lut *lut;
    83		void __iomem *lut_base;
    84		bool lut_diff;
    85		u16 lut_size;
    86		u32 cfg_val, word;
    87	
    88		/* If there's no gamma lut there's nothing to do here. */
    89		if (!state->gamma_lut)
    90			return;
    91	
    92		if (gamma && gamma->data) {
    93			lut_diff = gamma->data->lut_diff;
    94			lut_size = gamma->data->lut_size;
    95		} else {
    96			lut_diff = false;
    97			lut_size = LUT_SIZE_DEFAULT;
    98		}
    99	
   100		cfg_val = readl(regs + DISP_GAMMA_CFG);
   101		lut_base = regs + DISP_GAMMA_LUT;
   102		lut = (struct drm_color_lut *)state->gamma_lut->data;
   103		for (i = 0; i < lut_size; i++) {
   104			struct drm_color_lut diff, hwlut;
   105	
   106			hwlut.red = drm_color_lut_extract(lut[i].red, LUT_BITS_DEFAULT);
   107			hwlut.green = drm_color_lut_extract(lut[i].green, LUT_BITS_DEFAULT);
   108			hwlut.red = drm_color_lut_extract(lut[i].blue, LUT_BITS_DEFAULT);
   109	
   110			if (!lut_diff || (i % 2 == 0)) {
 > 111				word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, hwlut.red);
   112				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, hwlut.green);
   113				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, hwlut.blue);
   114			} else {
   115				diff.red = lut[i].red - lut[i - 1].red;
   116				diff.red = drm_color_lut_extract(diff.red, LUT_BITS_DEFAULT);
   117	
   118				diff.green = lut[i].green - lut[i - 1].green;
   119				diff.green = drm_color_lut_extract(diff.green, LUT_BITS_DEFAULT);
   120	
   121				diff.blue = lut[i].blue - lut[i - 1].blue;
   122				diff.blue = drm_color_lut_extract(diff.blue, LUT_BITS_DEFAULT);
   123	
   124				word = FIELD_PREP(DISP_GAMMA_LUT_10BIT_R, diff.red);
   125				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_G, diff.green);
   126				word |= FIELD_PREP(DISP_GAMMA_LUT_10BIT_B, diff.blue);
   127			}
   128			writel(word, (lut_base + i * 4));
   129		}
   130	
   131		/* Enable the gamma table */
   132		cfg_val |= FIELD_PREP(GAMMA_LUT_EN, 1);
   133	
   134		writel(cfg_val, regs + DISP_GAMMA_CFG);
   135	}
   136	

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