Hi Chenyang,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm/drm-next] [also build test WARNING on v5.18-rc3 next-20220422] [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-... base: git://anongit.freedesktop.org/drm/drm drm-next config: riscv-allmodconfig (https://download.01.org/0day-ci/archive/20220423/202204230046.2fBNTJrK-lkp@i...) compiler: riscv64-linux-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/intel-lab-lkp/linux/commit/4a5b6ac99c37617e030a054ca431c5... 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/20220422-161914 git checkout 4a5b6ac99c37617e030a054ca431c5c9aab227b8 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/gpu/drm/loongson/

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/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