[intel-linux-intel-lts:5.4/yocto 44/1142] drivers/gpu/drm/kmb/kmb_plane.c:57:14: warning: no previous prototype for 'set_pixel_format'

[intel-linux-intel-lts:5.4/yocto 44/1142] drivers/gpu/drm/kmb/kmb_plane.c:57:14: warning: no previous prototype for 'set_pixel_format'

[kernel test robot]

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tree:   https://github.com/intel/linux-intel-lts.git 5.4/yocto
head:   eeb611e5394c56d45c5cc8f7dc484c9f19e93143
commit: 5dd63f642613babcc3b8eea1bc8212dc15f10558 [44/1142] drm/kmb: Set correct values in the LAYERn_CFG register
config: arm64-allyesconfig (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://github.com/intel/linux-intel-lts/commit/5dd63f642613babcc3b8eea1bc8212dc15f10558
        git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-linux-intel-lts 5.4/yocto
        git checkout 5dd63f642613babcc3b8eea1bc8212dc15f10558
        # 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@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/kmb/kmb_plane.c:57:14: warning: no previous prototype for 'set_pixel_format' [-Wmissing-prototypes]
      57 | unsigned int set_pixel_format(u32 format)
         |              ^~~~~~~~~~~~~~~~
>> drivers/gpu/drm/kmb/kmb_plane.c:144:14: warning: no previous prototype for 'set_bits_per_pixel' [-Wmissing-prototypes]
     144 | unsigned int set_bits_per_pixel(const struct drm_format_info *format)
         |              ^~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/kmb/kmb_plane.c:275:25: warning: no previous prototype for 'kmb_plane_duplicate_state' [-Wmissing-prototypes]
     275 | struct drm_plane_state *kmb_plane_duplicate_state(struct drm_plane *plane)
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/set_pixel_format +57 drivers/gpu/drm/kmb/kmb_plane.c

    56	
  > 57	unsigned int set_pixel_format(u32 format)
    58	{
    59		unsigned int val = 0;
    60	
    61		switch (format) {
    62		/*planar formats */
    63		case DRM_FORMAT_YUV444:
    64			val = LCD_LAYER_FORMAT_YCBCR444PLAN | LCD_LAYER_PLANAR_STORAGE;
    65			break;
    66		case DRM_FORMAT_YVU444:
    67			val = LCD_LAYER_FORMAT_YCBCR444PLAN | LCD_LAYER_PLANAR_STORAGE
    68				| LCD_LAYER_CRCB_ORDER;
    69			break;
    70		case DRM_FORMAT_YUV422:
    71			val = LCD_LAYER_FORMAT_YCBCR422PLAN | LCD_LAYER_PLANAR_STORAGE;
    72			break;
    73		case DRM_FORMAT_YVU422:
    74			val = LCD_LAYER_FORMAT_YCBCR422PLAN | LCD_LAYER_PLANAR_STORAGE
    75			       | LCD_LAYER_CRCB_ORDER;
    76			break;
    77		case DRM_FORMAT_YUV420:
    78			val = LCD_LAYER_FORMAT_YCBCR420PLAN | LCD_LAYER_PLANAR_STORAGE;
    79			break;
    80		case DRM_FORMAT_YVU420:
    81			val = LCD_LAYER_FORMAT_YCBCR420PLAN | LCD_LAYER_PLANAR_STORAGE
    82			       | LCD_LAYER_CRCB_ORDER;
    83			break;
    84		case DRM_FORMAT_NV12:
    85			val = LCD_LAYER_FORMAT_NV12 | LCD_LAYER_PLANAR_STORAGE;
    86			break;
    87		case DRM_FORMAT_NV21:
    88			val = LCD_LAYER_FORMAT_NV12 | LCD_LAYER_PLANAR_STORAGE
    89			       | LCD_LAYER_CRCB_ORDER;
    90			break;
    91		/* packed formats */
    92		case DRM_FORMAT_RGB332:
    93			val = LCD_LAYER_FORMAT_RGB332;
    94			break;
    95		case DRM_FORMAT_XBGR4444:
    96			val = LCD_LAYER_FORMAT_RGBX4444 | LCD_LAYER_BGR_ORDER;
    97			break;
    98		case DRM_FORMAT_ARGB4444:
    99			val = LCD_LAYER_FORMAT_RGBA4444;
   100			break;
   101		case DRM_FORMAT_ABGR4444:
   102			val = LCD_LAYER_FORMAT_RGBA4444 | LCD_LAYER_BGR_ORDER;
   103			break;
   104		case DRM_FORMAT_XRGB1555:
   105			val = LCD_LAYER_FORMAT_XRGB1555;
   106			break;
   107		case DRM_FORMAT_XBGR1555:
   108			val = LCD_LAYER_FORMAT_XRGB1555 | LCD_LAYER_BGR_ORDER;
   109			break;
   110		case DRM_FORMAT_ARGB1555:
   111			val = LCD_LAYER_FORMAT_RGBA1555;
   112			break;
   113		case DRM_FORMAT_ABGR1555:
   114			val = LCD_LAYER_FORMAT_RGBA1555 | LCD_LAYER_BGR_ORDER;
   115			break;
   116		case DRM_FORMAT_RGB565:
   117			val = LCD_LAYER_FORMAT_RGB565;
   118			break;
   119		case DRM_FORMAT_BGR565:
   120			val = LCD_LAYER_FORMAT_RGB565 | LCD_LAYER_BGR_ORDER;
   121			break;
   122		case DRM_FORMAT_RGB888:
   123			val = LCD_LAYER_FORMAT_RGB888;
   124			break;
   125		case DRM_FORMAT_BGR888:
   126			val = LCD_LAYER_FORMAT_RGB888 | LCD_LAYER_BGR_ORDER;
   127			break;
   128		case DRM_FORMAT_XRGB8888:
   129			val = LCD_LAYER_FORMAT_RGBX8888;
   130			break;
   131		case DRM_FORMAT_XBGR8888:
   132			val = LCD_LAYER_FORMAT_RGBX8888 | LCD_LAYER_BGR_ORDER;
   133			break;
   134		case DRM_FORMAT_ARGB8888:
   135			val = LCD_LAYER_FORMAT_RGBA8888;
   136			break;
   137		case DRM_FORMAT_ABGR8888:
   138			val = LCD_LAYER_FORMAT_RGBA8888 | LCD_LAYER_BGR_ORDER;
   139			break;
   140		}
   141		return val;
   142	}
   143	
 > 144	unsigned int set_bits_per_pixel(const struct drm_format_info *format)
   145	{
   146		int i;
   147		u32 bpp = 0;
   148		unsigned int val = 0;
   149	
   150		for (i = 0; i < format->num_planes; i++)
   151			bpp += 8*format->cpp[i];
   152	
   153		switch (bpp) {
   154		case 8:
   155			val = LCD_LAYER_8BPP;
   156			break;
   157		case 16:
   158			val = LCD_LAYER_16BPP;
   159			break;
   160		case 24:
   161			val = LCD_LAYER_24BPP;
   162			break;
   163		case 32:
   164			val = LCD_LAYER_32BPP;
   165			break;
   166		}
   167		return val;
   168	}
   169	

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

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