Hi Jacopo, I love your patch! Yet something to improve: [auto build test ERROR on media-tree/master] [also build test ERROR on v5.16-rc5 next-20211216] [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/Jacopo-Mondi/media-adv748x-Add-C... base: git://linuxtv.org/media_tree.git master config: arc-randconfig-r043-20211216 (https://download.01.org/0day-ci/archive/20211217/202112171539.cPT19ZOz-lk...) compiler: arc-elf-gcc (GCC) 11.2.0 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/90158bf217d9df03d83fac378198a756a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jacopo-Mondi/media-adv748x-Add-CSI-2-VC-support/20211217-010519 git checkout 90158bf217d9df03d83fac378198a756af229010 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/media/i2c/adv748x/adv748x-csi2.c: In function 'adv748x_csi2_init_cfg': drivers/media/i2c/adv748x/adv748x-csi2.c:146:34: error: array type has incomplete element type 'struct v4l2_subdev_route' 146 | struct v4l2_subdev_route routes[ADV748X_CSI2_STREAMS] = { | ^~~~~~ drivers/media/i2c/adv748x/adv748x-csi2.c:152:34: error: 'V4L2_SUBDEV_ROUTE_FL_ACTIVE' undeclared (first use in this function); did you mean 'V4L2_SUBDEV_FORMAT_ACTIVE'? 152 | .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ | V4L2_SUBDEV_FORMAT_ACTIVE drivers/media/i2c/adv748x/adv748x-csi2.c:152:34: note: each undeclared identifier is reported only once for each function it appears in drivers/media/i2c/adv748x/adv748x-csi2.c:173:37: error: storage size of 'routing' isn't known 173 | struct v4l2_subdev_krouting routing; | ^~~~~~~ drivers/media/i2c/adv748x/adv748x-csi2.c:179:9: error: implicit declaration of function 'v4l2_subdev_lock_state'; did you mean 'v4l2_subdev_alloc_state'? [-Werror=implicit-function-declaration] 179 | v4l2_subdev_lock_state(state); | ^~~~~~~~~~~~~~~~~~~~~~ | v4l2_subdev_alloc_state drivers/media/i2c/adv748x/adv748x-csi2.c:180:15: error: implicit declaration of function 'v4l2_subdev_set_routing'; did you mean 'v4l2_subdev_notify'? [-Werror=implicit-function-declaration] 180 | ret = v4l2_subdev_set_routing(sd, state, &routing); | ^~~~~~~~~~~~~~~~~~~~~~~ | v4l2_subdev_notify drivers/media/i2c/adv748x/adv748x-csi2.c:181:9: error: implicit declaration of function 'v4l2_subdev_unlock_state'; did you mean 'v4l2_subdev_alloc_state'? [-Werror=implicit-function-declaration] 181 | v4l2_subdev_unlock_state(state); | ^~~~~~~~~~~~~~~~~~~~~~~~ | v4l2_subdev_alloc_state drivers/media/i2c/adv748x/adv748x-csi2.c:173:37: warning: unused variable 'routing' [-Wunused-variable] 173 | struct v4l2_subdev_krouting routing; | ^~~~~~~ drivers/media/i2c/adv748x/adv748x-csi2.c:146:34: warning: unused variable 'routes' [-Wunused-variable] 146 | struct v4l2_subdev_route routes[ADV748X_CSI2_STREAMS] = { | ^~~~~~ drivers/media/i2c/adv748x/adv748x-csi2.c: In function 'adv748x_csi2_set_format': 198 | fmt = v4l2_state_get_stream_format(sd_state, sdformat->pad, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ | v4l2_subdev_get_try_format 199 | sdformat->stream); | ^~ 207 | fmt = v4l2_subdev_state_get_opposite_stream_format(sd_state, sdformat->pad, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/adv748x/adv748x-csi2.c:208:68: error: 'struct v4l2_subdev_format' has no member named 'stream' 208 | sdformat->stream); | ^~ drivers/media/i2c/adv748x/adv748x-csi2.c: At top level: 253 | .get_fmt = v4l2_subdev_get_fmt, | ^~~~~~~~~~~~~~~~~~~ | v4l2_subdev_notify drivers/media/i2c/adv748x/adv748x-csi2.c: In function 'adv748x_csi2_init': drivers/media/i2c/adv748x/adv748x-csi2.c:323:29: error: 'V4L2_SUBDEV_FL_MULTIPLEXED' undeclared (first use in this function) 323 | V4L2_SUBDEV_FL_MULTIPLEXED, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/adv748x/adv748x-csi2.c:340:15: error: implicit declaration of function 'v4l2_subdev_init_finalize'; did you mean 'v4l2_subdev_init'? [-Werror=implicit-function-declaration] 340 | ret = v4l2_subdev_init_finalize(&tx->sd); | ^~~~~~~~~~~~~~~~~~~~~~~~~ | v4l2_subdev_init drivers/media/i2c/adv748x/adv748x-csi2.c:357:9: error: implicit declaration of function 'v4l2_subdev_cleanup'; did you mean 'v4l2_subdev_call'? [-Werror=implicit-function-declaration] 357 | v4l2_subdev_cleanup(&tx->sd); | ^~~~~~~~~~~~~~~~~~~ | v4l2_subdev_call cc1: some warnings being treated as errors vim +198 drivers/media/i2c/adv748x/adv748x-csi2.c 185 186 static int adv748x_csi2_set_format(struct v4l2_subdev *sd, 187 struct v4l2_subdev_state *sd_state, 188 struct v4l2_subdev_format *sdformat) 189 { 190 struct v4l2_mbus_framefmt *fmt; 191 int ret = 0; 192 193 /* Do not allow to set format on the multiplexed source pad. */ 194 if (sdformat->pad == ADV748X_CSI2_SOURCE) 195 return -EINVAL; 196 197 v4l2_subdev_lock_state(sd_state); 200 if (!fmt) { 201 ret = -EINVAL; 202 goto out; 203 }; 204 *fmt = sdformat->format; 205 206 /* Propagate format to the other end of the route. */ 208 sdformat->stream); 209 if (!fmt) { 210 ret = -EINVAL; 211 goto out; 212 } 213 *fmt = sdformat->format; 214 215 out: 216 v4l2_subdev_unlock_state(sd_state); 217 218 return ret; 219 } 220 221 static int adv748x_csi2_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad, 222 struct v4l2_mbus_config *config) 223 { 224 struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd); 225 226 if (pad != ADV748X_CSI2_SOURCE) 227 return -EINVAL; 228 229 config->type = V4L2_MBUS_CSI2_DPHY; 230 switch (tx->active_lanes) { 231 case 1: 232 config->flags = V4L2_MBUS_CSI2_1_LANE; 233 break; 234 235 case 2: 236 config->flags = V4L2_MBUS_CSI2_2_LANE; 237 break; 238 239 case 3: 240 config->flags = V4L2_MBUS_CSI2_3_LANE; 241 break; 242 243 case 4: 244 config->flags = V4L2_MBUS_CSI2_4_LANE; 245 break; 246 } 247 248 return 0; 249 } 250 251 static const struct v4l2_subdev_pad_ops adv748x_csi2_pad_ops = { 252 .init_cfg = adv748x_csi2_init_cfg, 254 .set_fmt = adv748x_csi2_set_format, 255 .get_mbus_config = adv748x_csi2_get_mbus_config, 256 }; 257 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org