Hi Suraj, kernel test robot noticed the following build warnings:
[auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on next-20250725] [cannot apply to linus/master v6.16-rc7] [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/Suraj-Kandpal/drm-writeback-Add-function-that-takes-preallocated-connector/20250725-133017 base: git://anongit.freedesktop.org/drm-intel for-linux-next patch link: https://lore.kernel.org/r/20250725050409.2687242-28-suraj.kandpal%40intel.com patch subject: [PATCH 27/28] drm/i915/writeback: Make exception for writeback connector config: i386-buildonly-randconfig-006-20250725 (https://download.01.org/0day-ci/archive/20250726/202507262326.1j1vnzbd-...@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250726/202507262326.1j1vnzbd-...@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/202507262326.1j1vnzbd-...@intel.com/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/i915/display/intel_display.c:3785:4: warning: variable >> 'trans_pipe' is used uninitialized whenever switch default is taken >> [-Wsometimes-uninitialized] 3785 | default: | ^~~~~~~ drivers/gpu/drm/i915/display/intel_display.c:3819:7: note: uninitialized use occurs here 3819 | if (trans_pipe == crtc->pipe) | ^~~~~~~~~~ drivers/gpu/drm/i915/display/intel_display.c:3760:3: note: variable 'trans_pipe' is declared here 3760 | enum pipe trans_pipe; | ^ 1 warning generated. vim +/trans_pipe +3785 drivers/gpu/drm/i915/display/intel_display.c 3743 3744 static u8 hsw_enabled_transcoders(struct intel_crtc *crtc) 3745 { 3746 struct intel_display *display = to_intel_display(crtc); 3747 u8 panel_transcoder_mask = hsw_panel_transcoders(display); 3748 enum transcoder cpu_transcoder; 3749 u8 primary_pipe, secondary_pipes; 3750 u8 enabled_transcoders = 0; 3751 3752 /* 3753 * XXX: Do intel_display_power_get_if_enabled before reading this (for 3754 * consistency and less surprising code; it's in always on power). 3755 */ 3756 for_each_cpu_transcoder_masked(display, cpu_transcoder, 3757 panel_transcoder_mask) { 3758 enum intel_display_power_domain power_domain; 3759 intel_wakeref_t wakeref; 3760 enum pipe trans_pipe; 3761 u32 tmp = 0; 3762 3763 power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder); 3764 if (cpu_transcoder == TRANSCODER_WD_0 || 3765 cpu_transcoder == TRANSCODER_WD_1) { 3766 with_intel_display_power_if_enabled(display, power_domain, wakeref) 3767 tmp = intel_de_read(display, 3768 WD_TRANS_FUNC_CTL(cpu_transcoder)); 3769 if (!(tmp & TRANS_WD_FUNC_ENABLE)) 3770 continue; 3771 3772 switch (tmp & WD_INPUT_SELECT_MASK) { 3773 case WD_INPUT_PIPE_A: 3774 trans_pipe = PIPE_A; 3775 break; 3776 case WD_INPUT_PIPE_B: 3777 trans_pipe = PIPE_B; 3778 break; 3779 case WD_INPUT_PIPE_C: 3780 trans_pipe = PIPE_C; 3781 break; 3782 case WD_INPUT_PIPE_D: 3783 trans_pipe = PIPE_D; 3784 break; > 3785 default: 3786 MISSING_CASE(tmp & WD_INPUT_SELECT_MASK); 3787 break; 3788 } 3789 } else { 3790 with_intel_display_power_if_enabled(display, power_domain, wakeref) 3791 tmp = intel_de_read(display, 3792 TRANS_DDI_FUNC_CTL(display, cpu_transcoder)); 3793 3794 if (!(tmp & TRANS_DDI_FUNC_ENABLE)) 3795 continue; 3796 3797 switch (tmp & TRANS_DDI_EDP_INPUT_MASK) { 3798 default: 3799 drm_WARN(display->drm, 1, 3800 "unknown pipe linked to transcoder %s\n", 3801 transcoder_name(cpu_transcoder)); 3802 fallthrough; 3803 case TRANS_DDI_EDP_INPUT_A_ONOFF: 3804 case TRANS_DDI_EDP_INPUT_A_ON: 3805 trans_pipe = PIPE_A; 3806 break; 3807 case TRANS_DDI_EDP_INPUT_B_ONOFF: 3808 trans_pipe = PIPE_B; 3809 break; 3810 case TRANS_DDI_EDP_INPUT_C_ONOFF: 3811 trans_pipe = PIPE_C; 3812 break; 3813 case TRANS_DDI_EDP_INPUT_D_ONOFF: 3814 trans_pipe = PIPE_D; 3815 break; 3816 } 3817 } 3818 3819 if (trans_pipe == crtc->pipe) 3820 enabled_transcoders |= BIT(cpu_transcoder); 3821 } 3822 3823 /* single pipe or joiner primary */ 3824 cpu_transcoder = (enum transcoder) crtc->pipe; 3825 if (transcoder_ddi_func_is_enabled(display, cpu_transcoder)) 3826 enabled_transcoders |= BIT(cpu_transcoder); 3827 3828 /* joiner secondary -> consider the primary pipe's transcoder as well */ 3829 enabled_joiner_pipes(display, crtc->pipe, &primary_pipe, &secondary_pipes); 3830 if (secondary_pipes & BIT(crtc->pipe)) { 3831 cpu_transcoder = (enum transcoder)ffs(primary_pipe) - 1; 3832 if (transcoder_ddi_func_is_enabled(display, cpu_transcoder)) 3833 enabled_transcoders |= BIT(cpu_transcoder); 3834 } 3835 3836 return enabled_transcoders; 3837 } 3838 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
