Hi Hermes, kernel test robot noticed the following build warnings:
[auto build test WARNING on 2622649ad6cdbb3e77bfafc8c0fe686090b77f70] url: https://github.com/intel-lab-lkp/linux/commits/Hermes-Wu-via-B4-Relay/dt-bindings-display-bridge-Add-ITE-IT6162-MIPI-DSI-to-HDMI-bridge/20260309-174457 base: 2622649ad6cdbb3e77bfafc8c0fe686090b77f70 patch link: https://lore.kernel.org/r/20260309-upstream-6162-v2-2-debdb6c88030%40ite.com.tw patch subject: [PATCH v2 2/2] drm/bridge: Add ITE IT6162 MIPI DSI to HDMI bridge driver config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260309/[email protected]/config) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260309/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/bridge/ite-it6162.c:728:7: warning: variable 'cp_status' is >> used uninitialized whenever 'if' condition is false >> [-Wsometimes-uninitialized] 728 | if (it6162->hdcp_sts != hdcp_sts || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 729 | it6162->hdcp_sts == NO_HDCP_STATE) { | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/bridge/ite-it6162.c:759:57: note: uninitialized use occurs here 759 | drm_hdcp_update_content_protection(it6162->connector, cp_status); | ^~~~~~~~~ drivers/gpu/drm/bridge/ite-it6162.c:728:3: note: remove the 'if' if its condition is always true 728 | if (it6162->hdcp_sts != hdcp_sts || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 729 | it6162->hdcp_sts == NO_HDCP_STATE) { | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/bridge/ite-it6162.c:703:15: note: initialize the variable 'cp_status' to silence this warning 703 | u64 cp_status; | ^ | = 0 1 warning generated. vim +728 drivers/gpu/drm/bridge/ite-it6162.c 695 696 static void it6162_hdcp_handler(struct it6162 *it6162) 697 { 698 struct regmap *regmap = it6162->regmap; 699 unsigned int tx_status, sink_cap; 700 enum hdcp_state hdcp_sts; 701 struct it6162_hdcp_cfg *hdcp_cfg = &it6162->hdcp_cfg; 702 u8 hdcp_ver; 703 u64 cp_status; 704 705 if (hdcp_cfg->hdcp_version == NO_HDCP || !it6162->en_hdcp) { 706 drm_dbg(it6162->drm, "HDCP not enabled, skip hdcp check"); 707 return; 708 } 709 710 regmap_read(regmap, OFFSET_TX_STATUS, &tx_status); 711 regmap_read(regmap, OFFSET_SINK_CAP, &sink_cap); 712 713 drm_dbg(it6162->drm, "Tx status %x", tx_status); 714 drm_dbg(it6162->drm, "SINK capability %x", sink_cap); 715 716 if (!GET_TX_VIDEO_STATUS(tx_status)) { 717 drm_dbg(it6162->drm, "video not stable, skip hdcp check"); 718 return; 719 } 720 721 hdcp_sts = GET_TX_HDCP_STATUS(tx_status); 722 hdcp_ver = GET_SINK_CAP_HDCP_VER(sink_cap); 723 drm_dbg(it6162->drm, "hdcp status: %x->%x, version: %x-%x", 724 it6162->hdcp_sts, hdcp_sts, 725 it6162->hdcp_version, hdcp_ver); 726 727 if (it6162->hdcp_version != NO_HDCP) { > 728 if (it6162->hdcp_sts != hdcp_sts || 729 it6162->hdcp_sts == NO_HDCP_STATE) { 730 it6162->hdcp_sts = hdcp_sts; 731 cp_status = DRM_MODE_CONTENT_PROTECTION_DESIRED; 732 switch (hdcp_sts) { 733 case AUTH_DONE: 734 drm_dbg(it6162->drm, "HDCP AUTH DONE"); 735 it6162_update_hdcp(it6162); 736 cp_status = DRM_MODE_CONTENT_PROTECTION_ENABLED; 737 break; 738 case AUTH_FAIL: 739 drm_dbg(it6162->drm, "HDCP AUTH FAIL"); 740 if (hdcp_ver == HDCP_23) { 741 drm_dbg(it6162->drm, 742 "HDCP 2.3 auth fail, change to HDCP 1.4"); 743 it6162_tx_hdcp_setup(it6162, 744 HDCP_14, 745 true); 746 } else { 747 it6162_tx_hdcp_disable(it6162); 748 } 749 750 break; 751 default: 752 drm_dbg(it6162->drm, "HDCP NO AUTH"); 753 it6162_tx_hdcp_setup(it6162, 754 it6162->hdcp_version, 755 true); 756 break; 757 } 758 } 759 drm_hdcp_update_content_protection(it6162->connector, cp_status); 760 } 761 } 762 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
