Re: [PATCH v2 2/2] drm/bridge: Add ITE IT6162 MIPI DSI to HDMI bridge driver
From: kernel test robot
Date: Mon Mar 09 2026 - 11:28:49 EST
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/20260309/202603092305.W1fFHKL5-lkp@xxxxxxxxx/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/20260309/202603092305.W1fFHKL5-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/202603092305.W1fFHKL5-lkp@xxxxxxxxx/
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