tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 60eac8672b5b6061ec07499c0f1b79f6d94311ce commit: b473bd5fc333ab02479444dd4a51be5f5e324d97 [2767/3509] drm/amd/display: refine wake up aux in retrieve link caps config: arm64-randconfig-r026-20221023 (attached as .config) compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920) 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 # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b473bd5fc333ab02479444dd4a51be5f5e324d97 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout b473bd5fc333ab02479444dd4a51be5f5e324d97 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash 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/amd/amdgpu/../display/dc/core/dc_link_dp.c:5230:16: warning: no previous prototype for function 'wake_up_aux_channel' [-Wmissing-prototypes] enum dc_status wake_up_aux_channel(struct dc_link *link) ^ drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:5230:1: note: declare 'static' if the function is not intended to be used outside of this translation unit enum dc_status wake_up_aux_channel(struct dc_link *link) ^ static 1 warning generated. vim +/wake_up_aux_channel +5230 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c 5229 > 5230 enum dc_status wake_up_aux_channel(struct dc_link *link) 5231 { 5232 enum dc_status status = DC_ERROR_UNEXPECTED; 5233 uint32_t aux_channel_retry_cnt = 0; 5234 uint8_t dpcd_power_state = '\0'; 5235 5236 while (status != DC_OK && aux_channel_retry_cnt < 10) { 5237 status = core_link_read_dpcd(link, DP_SET_POWER, 5238 &dpcd_power_state, sizeof(dpcd_power_state)); 5239 5240 /* Delay 1 ms if AUX CH is in power down state. Based on spec 5241 * section 2.3.1.2, if AUX CH may be powered down due to 5242 * write to DPCD 600h = 2. Sink AUX CH is monitoring differential 5243 * signal and may need up to 1 ms before being able to reply. 5244 */ 5245 if (status != DC_OK || dpcd_power_state == DP_SET_POWER_D3) { 5246 udelay(1000); 5247 aux_channel_retry_cnt++; 5248 } 5249 } 5250 5251 if (status != DC_OK) { 5252 dpcd_power_state = DP_SET_POWER_D0; 5253 status = core_link_write_dpcd( 5254 link, 5255 DP_SET_POWER, 5256 &dpcd_power_state, 5257 sizeof(dpcd_power_state)); 5258 5259 dpcd_power_state = DP_SET_POWER_D3; 5260 status = core_link_write_dpcd( 5261 link, 5262 DP_SET_POWER, 5263 &dpcd_power_state, 5264 sizeof(dpcd_power_state)); 5265 return DC_ERROR_UNEXPECTED; 5266 } 5267 5268 return DC_OK; 5269 } 5270 -- 0-DAY CI Kernel Test Service https://01.org/lkp
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