Hi mac.shen, kernel test robot noticed the following build warnings: [auto build test WARNING on drm-misc/drm-misc-next] [also build test WARNING on linus/master v6.7-rc2] [cannot apply to pza/reset/next pza/imx-drm/next] [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/mac-shen/drm-mediatek-dp-Add-the-HDCP-feature-for-DisplayPort/20231125-152640 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next patch link: https://lore.kernel.org/r/20231124085346.26602-1-mac.shen%40mediatek.com patch subject: [PATCH] drm/mediatek/dp: Add the HDCP feature for DisplayPort config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20231125/202311252324.TTPd9IXz-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231125/202311252324.TTPd9IXz-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202311252324.TTPd9IXz-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/mediatek/mtk_dp.c:349:5: warning: no previous prototype for function 'mtk_dp_read' [-Wmissing-prototypes] 349 | u32 mtk_dp_read(struct mtk_dp *mtk_dp, u32 offset) | ^ drivers/gpu/drm/mediatek/mtk_dp.c:349:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 349 | u32 mtk_dp_read(struct mtk_dp *mtk_dp, u32 offset) | ^ | static >> drivers/gpu/drm/mediatek/mtk_dp.c:376:5: warning: no previous prototype for function 'mtk_dp_update_bits' [-Wmissing-prototypes] 376 | int mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset, | ^ drivers/gpu/drm/mediatek/mtk_dp.c:376:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 376 | int mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset, | ^ | static >> drivers/gpu/drm/mediatek/mtk_dp.c:2663:6: warning: no previous prototype for function 'mtk_dp_check_hdcp_version' [-Wmissing-prototypes] 2663 | void mtk_dp_check_hdcp_version(struct mtk_dp *mtk_dp, bool only_hdcp1x) | ^ drivers/gpu/drm/mediatek/mtk_dp.c:2663:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 2663 | void mtk_dp_check_hdcp_version(struct mtk_dp *mtk_dp, bool only_hdcp1x) | ^ | static 3 warnings generated. vim +/mtk_dp_read +349 drivers/gpu/drm/mediatek/mtk_dp.c 348 > 349 u32 mtk_dp_read(struct mtk_dp *mtk_dp, u32 offset) 350 { 351 return mtk_dp_reg_read(mtk_dp->regs, offset); 352 } 353 354 static int mtk_dp_write(struct mtk_dp *mtk_dp, u32 offset, u32 val) 355 { 356 int ret = regmap_write(mtk_dp->regs, offset, val); 357 358 if (ret) 359 dev_err(mtk_dp->dev, 360 "Failed to write register 0x%x with value 0x%x\n", 361 offset, val); 362 return ret; 363 } 364 365 int mtk_dp_reg_update_bits(struct regmap *regs, u32 offset, 366 u32 val, u32 mask) 367 { 368 int ret = regmap_update_bits(regs, offset, mask, val); 369 370 if (ret) 371 pr_err("Failed to update register 0x%x with value 0x%x, mask 0x%x\n", 372 offset, val, mask); 373 return ret; 374 } 375 > 376 int mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset, 377 u32 val, u32 mask) 378 { 379 return mtk_dp_reg_update_bits(mtk_dp->regs, offset, val, mask); 380 } 381 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
