[kbuild-all] [intel-linux-intel-lts:5.4/yocto 50/1142] drivers/gpu/drm/kmb/kmb_dsi.c:206:5: warning: no previous prototype for 'mipi_get_datatype_params'

tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 8fd392d9856e8537c81f680ccade84783ef0eadb [50/1142] drm/kmb: Part 1 of Mipi Tx Initialization 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/8fd392d9856e8537c81f680cc... 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 8fd392d9856e8537c81f680ccade84783ef0eadb # 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(a)intel.com&gt; All warnings (new ones prefixed by >>): 206 | u32 mipi_get_datatype_params(u32 data_type, u32 data_mode, | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +/mipi_get_datatype_params +206 drivers/gpu/drm/kmb/kmb_dsi.c 205 207 struct mipi_data_type_params *params) 208 { 209 struct mipi_data_type_params data_type_parameters; 210 211 switch (data_type) { 212 case DSI_LP_DT_PPS_YCBCR420_12B: 213 data_type_parameters.size_constraint_pixels = 2; 214 data_type_parameters.size_constraint_bytes = 3; 215 switch (data_mode) { 216 /* case 0 not supported according to MDK */ 217 case 1: 218 case 2: 219 case 3: 220 data_type_parameters.pixels_per_pclk = 2; 221 data_type_parameters.bits_per_pclk = 24; 222 break; 223 default: 224 DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode); 225 return -EINVAL; 226 }; 227 break; 228 case DSI_LP_DT_PPS_YCBCR422_16B: 229 data_type_parameters.size_constraint_pixels = 2; 230 data_type_parameters.size_constraint_bytes = 4; 231 switch (data_mode) { 232 /* case 0 and 1 not supported according to MDK */ 233 case 2: 234 data_type_parameters.pixels_per_pclk = 1; 235 data_type_parameters.bits_per_pclk = 16; 236 break; 237 case 3: 238 data_type_parameters.pixels_per_pclk = 2; 239 data_type_parameters.bits_per_pclk = 32; 240 break; 241 default: 242 DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode); 243 return -EINVAL; 244 }; 245 break; 246 case DSI_LP_DT_LPPS_YCBCR422_20B: 247 case DSI_LP_DT_PPS_YCBCR422_24B: 248 data_type_parameters.size_constraint_pixels = 2; 249 data_type_parameters.size_constraint_bytes = 6; 250 switch (data_mode) { 251 /* case 0 not supported according to MDK */ 252 case 1: 253 case 2: 254 case 3: 255 data_type_parameters.pixels_per_pclk = 1; 256 data_type_parameters.bits_per_pclk = 24; 257 break; 258 default: 259 DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode); 260 return -EINVAL; 261 }; 262 break; 263 case DSI_LP_DT_PPS_RGB565_16B: 264 data_type_parameters.size_constraint_pixels = 1; 265 data_type_parameters.size_constraint_bytes = 2; 266 switch (data_mode) { 267 case 0: 268 case 1: 269 data_type_parameters.pixels_per_pclk = 1; 270 data_type_parameters.bits_per_pclk = 16; 271 break; 272 case 2: 273 case 3: 274 data_type_parameters.pixels_per_pclk = 2; 275 data_type_parameters.bits_per_pclk = 32; 276 break; 277 default: 278 DRM_ERROR("DSI: Invalid data_mode %d\n", data_mode); 279 return -EINVAL; 280 }; 281 break; 282 case DSI_LP_DT_PPS_RGB666_18B: 283 data_type_parameters.size_constraint_pixels = 4; 284 data_type_parameters.size_constraint_bytes = 9; 285 data_type_parameters.bits_per_pclk = 18; 286 data_type_parameters.pixels_per_pclk = 1; 287 break; 288 case DSI_LP_DT_LPPS_RGB666_18B: 289 case DSI_LP_DT_PPS_RGB888_24B: 290 data_type_parameters.size_constraint_pixels = 1; 291 data_type_parameters.size_constraint_bytes = 3; 292 data_type_parameters.bits_per_pclk = 24; 293 data_type_parameters.pixels_per_pclk = 1; 294 break; 295 case DSI_LP_DT_PPS_RGB101010_30B: 296 data_type_parameters.size_constraint_pixels = 4; 297 data_type_parameters.size_constraint_bytes = 15; 298 data_type_parameters.bits_per_pclk = 30; 299 data_type_parameters.pixels_per_pclk = 1; 300 break; 301 302 default: 303 DRM_ERROR("DSI: Invalid data_type %d\n", data_type); 304 return -EINVAL; 305 } 306 307 *params = data_type_parameters; 308 return 0; 309 } 310 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org