tree: https://github.com/superna9999/linux amlogic/v5.17/g12-dsi head: 62dac9179f2937dc08bffe08d15c6846bc4aedb4 commit: b186318175a12bdca613ee26b4b452964c795eb3 [20/23] fixup! WIP: drm/meson: add DSI encoder config: arm-randconfig-r033-20211210 (https://download.01.org/0day-ci/archive/20211211/202112111247.XKv1vmaF-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/superna9999/linux/commit/b186318175a12bdca613ee26b4b45... git remote add superna9999 https://github.com/superna9999/linux git fetch --no-tags superna9999 amlogic/v5.17/g12-dsi git checkout b186318175a12bdca613ee26b4b452964c795eb3 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/meson/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): meson_venc_mipi_dsi_mode_set(priv, mode); ^~~~ drivers/gpu/drm/meson/meson_venc.h:71:32: note: passing argument to parameter 'mode' here struct drm_display_mode *mode); ^ drivers/gpu/drm/meson/meson_encoder_dsi.c:130:69: warning: variable 'ret' is uninitialized when used here [-Wuninitialized] dev_err(priv->dev, "Failed to find DSI transceiver bridge: %d\n", ret); ^~~ include/linux/dev_printk.h:144:65: note: expanded from macro 'dev_err' dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~~~~ include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap' _p_func(dev, fmt, ##__VA_ARGS__); \ ^~~~~~~~~~~ drivers/gpu/drm/meson/meson_encoder_dsi.c:109:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 warning and 1 error generated. vim +59 drivers/gpu/drm/meson/meson_encoder_dsi.c 6b197be782e041 Neil Armstrong 2021-12-09 47 b186318175a12b Neil Armstrong 2021-12-10 48 static void meson_encoder_dsi_mode_set(struct drm_bridge *bridge, b186318175a12b Neil Armstrong 2021-12-10 49 const struct drm_display_mode *mode, b186318175a12b Neil Armstrong 2021-12-10 50 const struct drm_display_mode *adjusted_mode) 6b197be782e041 Neil Armstrong 2021-12-09 51 { 6b197be782e041 Neil Armstrong 2021-12-09 52 struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge); 6b197be782e041 Neil Armstrong 2021-12-09 53 struct meson_drm *priv = encoder_dsi->priv; 6b197be782e041 Neil Armstrong 2021-12-09 54 b186318175a12b Neil Armstrong 2021-12-10 55 pr_err("%s:%d\n", __func__, __LINE__); 6b197be782e041 Neil Armstrong 2021-12-09 56 b186318175a12b Neil Armstrong 2021-12-10 57 meson_vclk_setup(priv, MESON_VCLK_TARGET_DSI, mode->clock, 0, 0, 0, false); 6b197be782e041 Neil Armstrong 2021-12-09 58 d521159dd8a996 Neil Armstrong 2021-12-10 @59 meson_venc_mipi_dsi_mode_set(priv, mode); e1e87e576f5bef Neil Armstrong 2021-12-09 60 meson_encl_load_gamma(priv); 6b197be782e041 Neil Armstrong 2021-12-09 61 b186318175a12b Neil Armstrong 2021-12-10 62 writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN)); b186318175a12b Neil Armstrong 2021-12-10 63 e1e87e576f5bef Neil Armstrong 2021-12-09 64 writel_bits_relaxed(BIT(3), BIT(3), priv->io_base + _REG(ENCL_VIDEO_MODE_ADV)); e1e87e576f5bef Neil Armstrong 2021-12-09 65 writel_relaxed(0, priv->io_base + _REG(ENCL_TST_EN)); b186318175a12b Neil Armstrong 2021-12-10 66 } b186318175a12b Neil Armstrong 2021-12-10 67 :::::: The code at line 59 was first introduced by commit :::::: d521159dd8a996678230b50e4ecafcdf50648c52 fixup! WIP: drm/meson: add DSI encoder :::::: TO: Neil Armstrong <narmstrong(a)baylibre.com&gt; :::::: CC: Neil Armstrong <narmstrong(a)baylibre.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org