Hi Chenyang, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-misc/drm-misc-next] [also build test WARNING on linus/master v5.19-rc3 next-20220624] [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/intel-lab-lkp/linux/commits/Chenyang-Li/drm-loongson-Add-DRM-Driver-for-Loongson-7A1000-bridge-chip/20220625-171037 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next config: powerpc-allmodconfig compiler: powerpc-linux-gcc (GCC) 11.3.0 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-lab-lkp/linux/commit/3af56da81352153b38e05c082b8f2bf8c9fc0320 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Chenyang-Li/drm-loongson-Add-DRM-Driver-for-Loongson-7A1000-bridge-chip/20220625-171037 git checkout 3af56da81352153b38e05c082b8f2bf8c9fc0320 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/gpu/drm/loongson/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/loongson/loongson_encoder.c:10:27: warning: no previous prototype for 'loongson_bridge_detect' [-Wmissing-prototypes] 10 | enum drm_connector_status loongson_bridge_detect(struct drm_bridge *bridge) | ^~~~~~~~~~~~~~~~~~~~~~ vim +/loongson_bridge_detect +10 drivers/gpu/drm/loongson/loongson_encoder.c 9 > 10 enum drm_connector_status loongson_bridge_detect(struct drm_bridge *bridge) 11 { 12 unsigned char start = 0x0; 13 struct i2c_msg msgs = { 14 .addr = DDC_ADDR, 15 .flags = 0, 16 .len = 1, 17 .buf = &start, 18 }; 19 20 if (i2c_transfer(bridge->ddc, &msgs, 1) != 1) 21 return connector_status_disconnected; 22 else 23 return connector_status_connected; 24 } 25 -- 0-DAY CI Kernel Test Service https://01.org/lkp
