Hi Ankit, kernel test robot noticed the following build warnings:
[auto build test WARNING on drm-tip/drm-tip] [also build test WARNING on linus/master v6.5-rc7 next-20230823] [cannot apply to drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Ankit-Nautiyal/drm-display-dp-Default-8-bpc-support-when-DSC-is-supported/20230823-195946 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip patch link: https://lore.kernel.org/r/20230823115425.715644-2-ankit.k.nautiyal%40intel.com patch subject: [PATCH 1/2] drm/display/dp: Default 8 bpc support when DSC is supported config: i386-randconfig-r036-20230823 (https://download.01.org/0day-ci/archive/20230824/202308240007.1eds9xsl-...@intel.com/config) compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07) reproduce: (https://download.01.org/0day-ci/archive/20230824/202308240007.1eds9xsl-...@intel.com/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 <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202308240007.1eds9xsl-...@intel.com/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/display/drm_dp_helper.c:2451:6: warning: logical not is only >> applied to the left hand side of this bitwise operator >> [-Wlogical-not-parentheses] if (!dsc_dpcd[DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED) ^ ~ drivers/gpu/drm/display/drm_dp_helper.c:2451:6: note: add parentheses after the '!' to evaluate the bitwise operator first if (!dsc_dpcd[DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED) ^ ( ) drivers/gpu/drm/display/drm_dp_helper.c:2451:6: note: add parentheses around left hand side expression to silence this warning if (!dsc_dpcd[DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED) ^ ( ) 1 warning generated. vim +2451 drivers/gpu/drm/display/drm_dp_helper.c 2428 2429 /** 2430 * drm_dp_dsc_sink_supported_input_bpcs() - Get all the input bits per component 2431 * values supported by the DSC sink. 2432 * @dsc_dpcd: DSC capabilities from DPCD 2433 * @dsc_bpc: An array to be filled by this helper with supported 2434 * input bpcs. 2435 * 2436 * Read the DSC DPCD from the sink device to parse the supported bits per 2437 * component values. This is used to populate the DSC parameters 2438 * in the &struct drm_dsc_config by the driver. 2439 * Driver creates an infoframe using these parameters to populate 2440 * &struct drm_dsc_pps_infoframe. These are sent to the sink using DSC 2441 * infoframe using the helper function drm_dsc_pps_infoframe_pack() 2442 * 2443 * Returns: 2444 * Number of input BPC values parsed from the DPCD 2445 */ 2446 int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE], 2447 u8 dsc_bpc[3]) 2448 { 2449 int num_bpc = 0; 2450 > 2451 if (!dsc_dpcd[DP_DSC_SUPPORT] & > DP_DSC_DECOMPRESSION_IS_SUPPORTED) 2452 return 0; 2453 2454 u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT]; 2455 2456 if (color_depth & DP_DSC_12_BPC) 2457 dsc_bpc[num_bpc++] = 12; 2458 if (color_depth & DP_DSC_10_BPC) 2459 dsc_bpc[num_bpc++] = 10; 2460 2461 /* A DP DSC Sink devices shall support 8 bpc. */ 2462 dsc_bpc[num_bpc++] = 8; 2463 2464 return num_bpc; 2465 } 2466 EXPORT_SYMBOL(drm_dp_dsc_sink_supported_input_bpcs); 2467 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
