tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.14 head: 972c48e87ad66b0893810f0b2d839fcd77e5e31e commit: 972c48e87ad66b0893810f0b2d839fcd77e5e31e [14/14] CHROMIUM: ASoC: cs42l42: Switch to SCLK in IRQ config: x86_64-randconfig-a012-20210510 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a0fed635fe1701470062495a6ffee1c608f3f1bc) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-4.14 git checkout 972c48e87ad66b0893810f0b2d839fcd77e5e31e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): int cs42l42_trigger(struct snd_pcm_substream * substream, int cmd, struct snd_soc_dai *dai) ^ sound/soc/codecs/cs42l42.c:936:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int cs42l42_trigger(struct snd_pcm_substream * substream, int cmd, struct snd_soc_dai *dai) ^ static 1 warning generated. vim +/cs42l42_trigger +936 sound/soc/codecs/cs42l42.c 935 937 { 938 struct snd_soc_component *component = dai->component; 939 struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component); 940 unsigned int regval; 941 int ret; 942 unsigned int count = 0; 943 int streams = cs42l42->stream_use; 944 945 /* Count currently active streams */ 946 while (streams) { 947 if(streams & 1) 948 ++count; 949 streams >>= 1; 950 } 951 952 dev_dbg(component->dev, "%s() cs42l42->stream_use=%08x, active streams=%d\n", 953 __func__, cs42l42->stream_use, count); 954 955 regmap_read(cs42l42->regmap, CS42L42_PLL_LOCK_STATUS, &regval); 956 957 switch (cmd) { 958 case SNDRV_PCM_TRIGGER_START: 959 if (!regval) 960 snd_soc_component_update_bits(component, CS42L42_PLL_CTL1, 961 CS42L42_PLL_START_MASK, 1); 962 break; 963 964 case SNDRV_PCM_TRIGGER_STOP: 965 /* Last active stream, switching to SCO */ 966 if (count == 1) { 967 dev_dbg(component->dev, "%s() Switching to SCO\n", __func__); 968 969 regmap_multi_reg_write(cs42l42->regmap, cs42l42_to_osc_seq, 970 ARRAY_SIZE(cs42l42_to_osc_seq)); 971 972 snd_soc_component_update_bits(component, CS42L42_MCLK_SRC_SEL, 973 CS42L42_MCLK_SRC_SEL_MASK | 974 CS42L42_MCLKDIV_MASK, 975 (0 << CS42L42_MCLK_SRC_SEL_SHIFT) | 976 (0 << CS42L42_MCLKDIV_SHIFT)); 977 978 ret = snd_soc_component_update_bits(component, CS42L42_PLL_CTL1, 979 CS42L42_PLL_START_MASK, 0); 980 981 /* PLL unlock delay 10ms*/ 982 usleep_range(10000,12000); 983 984 regmap_read(cs42l42->regmap, CS42L42_PLL_LOCK_STATUS, &regval); 985 } 986 break; 987 988 default: 989 break; 990 } 991 992 cs42l42->pll_lock = regval; 993 994 return 0; 995 } 996 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org