tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.19 head: b9a3f5405fb3783912a70780b9f51b8942feed91 commit: feb6def7862784cd0dc0395670cd825f6c874014 [47/50] BACKPORT: drm/i915: Add HDCP 1.4 support for MST connectors config: i386-randconfig-a006-20201113 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-4.19 git checkout feb6def7862784cd0dc0395670cd825f6c874014 # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): drivers/gpu/drm/i915/intel_dp_hdcp.c: In function 'intel_dp_mst_hdcp_toggle_signalling': 247 | struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); | ^~~~ drivers/gpu/drm/i915/intel_dp_hdcp.c: In function 'intel_dp_mst_hdcp_check_link': drivers/gpu/drm/i915/intel_dp_hdcp.c:265:27: error: unused variable 'i915' [-Werror=unused-variable] 265 | struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); | ^~~~ cc1: all warnings being treated as errors vim +/i915 +247 drivers/gpu/drm/i915/intel_dp_hdcp.c 241 242 static int 243 intel_dp_mst_hdcp_toggle_signalling(struct intel_digital_port *dig_port, 244 enum transcoder cpu_transcoder, 245 bool enable) 246 { 248 int ret; 249 250 if (!enable) 251 usleep_range(6, 60); /* Bspec says >= 6us */ 252 253 ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base, 254 cpu_transcoder, enable); 255 if (ret) 256 DRM_DEBUG_KMS("%s HDCP signalling failed (%d)\n", 257 enable ? "Enable" : "Disable", ret); 258 return ret; 259 } 260 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org