tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: d2c5af89e80c5b71f1da59879464a930947306a2 commit: 6e9866706daac7dd4f69905954f8a662d7b173dd [82/132] drm/i915: Power up combo PHY lanes for for HDMI as well config: x86_64-randconfig-a005-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 436c6c9c20cc522c92a923440a5fc509c342a7db) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout 6e9866706daac7dd4f69905954f8a662d7b173dd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 errors (new ones prefixed by >>): intel_ddi_power_up_lanes(encoder, crtc_state); ^ 1 error generated. vim +/intel_ddi_power_up_lanes +3559 drivers/gpu/drm/i915/display/intel_ddi.c 3508 3509 static void intel_enable_ddi_hdmi(struct intel_encoder *encoder, 3510 const struct intel_crtc_state *crtc_state, 3511 const struct drm_connector_state *conn_state) 3512 { 3513 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 3514 struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base); 3515 struct drm_connector *connector = conn_state->connector; 3516 enum port port = encoder->port; 3517 3518 if (!intel_hdmi_handle_sink_scrambling(encoder, connector, 3519 crtc_state->hdmi_high_tmds_clock_ratio, 3520 crtc_state->hdmi_scrambling)) 3521 DRM_ERROR("[CONNECTOR:%d:%s] Failed to configure sink scrambling/TMDS bit clock ratio\n", 3522 connector->base.id, connector->name); 3523 3524 /* Display WA #1143: skl,kbl,cfl */ 3525 if (IS_GEN9_BC(dev_priv)) { 3526 /* 3527 * For some reason these chicken bits have been 3528 * stuffed into a transcoder register, event though 3529 * the bits affect a specific DDI port rather than 3530 * a specific transcoder. 3531 */ 3532 i915_reg_t reg = gen9_chicken_trans_reg_by_port(dev_priv, port); 3533 u32 val; 3534 3535 val = I915_READ(reg); 3536 3537 if (port == PORT_E) 3538 val |= DDIE_TRAINING_OVERRIDE_ENABLE | 3539 DDIE_TRAINING_OVERRIDE_VALUE; 3540 else 3541 val |= DDI_TRAINING_OVERRIDE_ENABLE | 3542 DDI_TRAINING_OVERRIDE_VALUE; 3543 3544 I915_WRITE(reg, val); 3545 POSTING_READ(reg); 3546 3547 udelay(1); 3548 3549 if (port == PORT_E) 3550 val &= ~(DDIE_TRAINING_OVERRIDE_ENABLE | 3551 DDIE_TRAINING_OVERRIDE_VALUE); 3552 else 3553 val &= ~(DDI_TRAINING_OVERRIDE_ENABLE | 3554 DDI_TRAINING_OVERRIDE_VALUE); 3555 3556 I915_WRITE(reg, val); 3557 } 3558 3560 3561 /* In HDMI/DVI mode, the port width, and swing/emphasis values 3562 * are ignored so nothing special needs to be done besides 3563 * enabling the port. 3564 */ 3565 I915_WRITE(DDI_BUF_CTL(port), 3566 dig_port->saved_port_bits | DDI_BUF_CTL_ENABLE); 3567 3568 if (crtc_state->has_audio) 3569 intel_audio_codec_enable(encoder, crtc_state, conn_state); 3570 } 3571 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org