tree: git://anongit.freedesktop.org/drm-intel topic/dp-hdmi-2.1-pcon head: 522508b665df3bbfdf40381d4e61777844b1703f commit: 522508b665df3bbfdf40381d4e61777844b1703f [15/15] drm/i915/display: Let PCON convert from RGB to YCbCr if it can config: x86_64-randconfig-r011-20210108 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5c951623bc8965fa1e89660f2f5f4a2944e4981a) 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 git remote add drm-intel git://anongit.freedesktop.org/drm-intel git fetch --no-tags drm-intel topic/dp-hdmi-2.1-pcon git checkout 522508b665df3bbfdf40381d4e61777844b1703f # 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@intel.com

All errors (new ones prefixed by >>):

...

drivers/gpu/drm/i915/display/intel_dp.c:6909:42: error: use of logical '||' with constant operand [-Werror,-Wconstant-logical-operand]

DP_DS_HDMI_BT601_RGB_YCBCR_CONV || ^ drivers/gpu/drm/i915/display/intel_dp.c:6909:42: note: use '|' for a bitwise operation DP_DS_HDMI_BT601_RGB_YCBCR_CONV || ^~ | drivers/gpu/drm/i915/display/intel_dp.c:6910:42: error: use of logical '||' with constant operand [-Werror,-Wconstant-logical-operand] DP_DS_HDMI_BT709_RGB_YCBCR_CONV || ^ drivers/gpu/drm/i915/display/intel_dp.c:6910:42: note: use '|' for a bitwise operation DP_DS_HDMI_BT709_RGB_YCBCR_CONV || ^~ |

...

drivers/gpu/drm/i915/display/intel_dp.c:6911:10: error: converting the result of '<<' to a boolean always evaluates to true [-Werror,-Wtautological-constant-compare]

DP_DS_HDMI_BT2020_RGB_YCBCR_CONV); ^ include/drm/drm_dp_helper.h:444:48: note: expanded from macro 'DP_DS_HDMI_BT2020_RGB_YCBCR_CONV' # define DP_DS_HDMI_BT2020_RGB_YCBCR_CONV (1 << 7) ^ drivers/gpu/drm/i915/display/intel_dp.c:6909:10: error: converting the result of '<<' to a boolean always evaluates to true [-Werror,-Wtautological-constant-compare] DP_DS_HDMI_BT601_RGB_YCBCR_CONV || ^ include/drm/drm_dp_helper.h:442:48: note: expanded from macro 'DP_DS_HDMI_BT601_RGB_YCBCR_CONV' # define DP_DS_HDMI_BT601_RGB_YCBCR_CONV (1 << 5) ^ drivers/gpu/drm/i915/display/intel_dp.c:6910:10: error: converting the result of '<<' to a boolean always evaluates to true [-Werror,-Wtautological-constant-compare] DP_DS_HDMI_BT709_RGB_YCBCR_CONV || ^ include/drm/drm_dp_helper.h:443:48: note: expanded from macro 'DP_DS_HDMI_BT709_RGB_YCBCR_CONV' # define DP_DS_HDMI_BT709_RGB_YCBCR_CONV (1 << 6) ^ 5 errors generated.

vim +6909 drivers/gpu/drm/i915/display/intel_dp.c

6879 6880 static void 6881 intel_dp_update_420(struct intel_dp *intel_dp) 6882 { 6883 struct drm_i915_private *i915 = dp_to_i915(intel_dp); 6884 struct intel_connector *connector = intel_dp->attached_connector; 6885 bool is_branch, ycbcr_420_passthrough, ycbcr_444_to_420, rgb_to_ycbcr; 6886 6887 /* No YCbCr output support on gmch platforms */ 6888 if (HAS_GMCH(i915)) 6889 return; 6890 6891 /* 6892 * ILK doesn't seem capable of DP YCbCr output. The 6893 * displayed image is severly corrupted. SNB+ is fine. 6894 */ 6895 if (IS_GEN(i915, 5)) 6896 return; 6897 6898 is_branch = drm_dp_is_branch(intel_dp->dpcd); 6899 ycbcr_420_passthrough = 6900 drm_dp_downstream_420_passthrough(intel_dp->dpcd, 6901 intel_dp->downstream_ports); 6902 /* on-board LSPCON always assumed to support 4:4:4->4:2:0 conversion */ 6903 ycbcr_444_to_420 = 6904 dp_to_dig_port(intel_dp)->lspcon.active || 6905 drm_dp_downstream_444_to_420_conversion(intel_dp->dpcd, 6906 intel_dp->downstream_ports); 6907 rgb_to_ycbcr = drm_dp_downstream_rgb_to_ycbcr_conversion(intel_dp->dpcd, 6908 intel_dp->downstream_ports,

6909 DP_DS_HDMI_BT601_RGB_YCBCR_CONV ||

6910 DP_DS_HDMI_BT709_RGB_YCBCR_CONV ||

6911 DP_DS_HDMI_BT2020_RGB_YCBCR_CONV);

6912 6913 if (INTEL_GEN(i915) >= 11) { 6914 /* Let PCON convert from RGB->YCbCr if possible */ 6915 if (is_branch && rgb_to_ycbcr && ycbcr_444_to_420) { 6916 intel_dp->dfp.rgb_to_ycbcr = true; 6917 intel_dp->dfp.ycbcr_444_to_420 = true; 6918 connector->base.ycbcr_420_allowed = true; 6919 } else { 6920 /* Prefer 4:2:0 passthrough over 4:4:4->4:2:0 conversion */ 6921 intel_dp->dfp.ycbcr_444_to_420 = 6922 ycbcr_444_to_420 && !ycbcr_420_passthrough; 6923 6924 connector->base.ycbcr_420_allowed = 6925 !is_branch || ycbcr_444_to_420 || ycbcr_420_passthrough; 6926 } 6927 } else { 6928 /* 4:4:4->4:2:0 conversion is the only way */ 6929 intel_dp->dfp.ycbcr_444_to_420 = ycbcr_444_to_420; 6930 6931 connector->base.ycbcr_420_allowed = ycbcr_444_to_420; 6932 } 6933 6934 drm_dbg_kms(&i915->drm, 6935 "[CONNECTOR:%d:%s] RGB->YcbCr conversion? %s, YCbCr 4:2:0 allowed? %s, YCbCr 4:4:4->4:2:0 conversion? %s\n", 6936 connector->base.base.id, connector->base.name, 6937 yesno(intel_dp->dfp.rgb_to_ycbcr), 6938 yesno(connector->base.ycbcr_420_allowed), 6939 yesno(intel_dp->dfp.ycbcr_444_to_420)); 6940 } 6941

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