Hi Tomi, I love your patch! Perhaps something to improve: [auto build test WARNING on pinchartl-media/drm/du/next] [also build test WARNING on linus/master v6.0-rc2 next-20220823] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Tomi-Valkeinen/drm-rcar-du-DSI-fixes/20220822-210756 base: git://linuxtv.org/pinchartl/media.git drm/du/next config: arm-defconfig (https://download.01.org/0day-ci/archive/20220824/202208240201.ss8E6NY0-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 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/d037472981c443d699c022aa91c5335f686d82ad git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Tomi-Valkeinen/drm-rcar-du-DSI-fixes/20220822-210756 git checkout d037472981c443d699c022aa91c5335f686d82ad # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/rcar-du/rcar_du_crtc.c:34: >> drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h:26:6: warning: no previous prototype for 'rcar_mipi_dsi_pclk_disable' [-Wmissing-prototypes] 26 | void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/rcar_mipi_dsi_pclk_disable +26 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h 25 > 26 void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge) 27 { 28 } 29 #endif /* CONFIG_DRM_RCAR_MIPI_DSI */ 30 -- 0-DAY CI Kernel Test Service https://01.org/lkp