Hi Gaurav, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20180223] [cannot apply to drm-intel/for-linux-next drm/drm-next v4.16-rc3 v4.16-rc2 v4.16-rc1 v4.16-rc3] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Gaurav-K-Singh/Enabling-VDSC-in-i915-driver-for-GLK/20180226-114246 config: x86_64-randconfig-x009-201808 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/gpu//drm/i915/intel_vdsc.c: In function 'intel_dsc_enable': >> drivers/gpu//drm/i915/intel_vdsc.c:1164:3: warning: 'dsc_type2' may be used uninitialized in this function [-Wmaybe-uninitialized] configure_dsc_params_for_dsc_controller(encoder, pipe_config, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ &dsc_regs, dsc_type2); ~~~~~~~~~~~~~~~~~~~~~ >> drivers/gpu//drm/i915/intel_vdsc.c:1160:2: warning: 'dsc_type1' may be used uninitialized in this function [-Wmaybe-uninitialized] configure_dsc_params_for_dsc_controller(encoder, pipe_config, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ &dsc_regs, dsc_type1); ~~~~~~~~~~~~~~~~~~~~~ vim +/dsc_type2 +1164 drivers/gpu//drm/i915/intel_vdsc.c 1103 1104 void intel_dsc_enable(struct intel_encoder *encoder, 1105 struct intel_crtc_state *pipe_config) 1106 { 1107 struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); 1108 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 1109 struct picture_parameters_set pps_params; 1110 struct intel_dsc_regs dsc_regs; 1111 struct drm_crtc *crtc = pipe_config->base.crtc; 1112 struct intel_crtc *intel_crtc = to_intel_crtc(crtc); 1113 int pipe = intel_crtc->pipe; 1114 int dsc_type1; 1115 int dsc_type2; 1116 int type = encoder->type; 1117 unsigned int dss_ctrl1_value = 0; 1118 unsigned int dss_ctrl2_value = 0; 1119 1120 if ((INTEL_GEN(dev_priv) < 9) || 1121 !intel_dp->compr_params.compression_support) 1122 return; 1123 /* TO DO: configure DSC params and program source regs */ 1124 1125 if (type == INTEL_OUTPUT_EDP) { 1126 dsc_regs.dss_ctrl1_reg = DSS_CONTROL1; 1127 dsc_regs.dss_ctrl2_reg = DSS_CONTROL2; 1128 dsc_regs.dip_ctrl_reg = VIDEO_DIP_CTL_EDP; 1129 dsc_regs.dip_pps_data_ctrl_reg = VIDEO_DIP_PPS_DATA_EDP_REG; 1130 dsc_type1 = DSC_A; 1131 dsc_type2 = DSC_C; 1132 } else if (type == INTEL_OUTPUT_DP) { 1133 switch (pipe) { 1134 case PIPE_A: 1135 dsc_regs.dss_ctrl1_reg = PIPE_DSS_CTL1_PB; 1136 dsc_regs.dss_ctrl2_reg = PIPE_DSS_CTL2_PB; 1137 dsc_regs.dip_ctrl_reg = VIDEO_DIP_CTL_A; 1138 dsc_regs.dip_pps_data_ctrl_reg = 1139 VIDEO_DIP_DRM_DATA_TRANSA_REG; 1140 dsc_type1 = PIPEA_DSC_0; 1141 dsc_type2 = PIPEA_DSC_1; 1142 break; 1143 case PIPE_B: 1144 dsc_regs.dss_ctrl1_reg = PIPE_DSS_CTL1_PC; 1145 dsc_regs.dss_ctrl2_reg = PIPE_DSS_CTL2_PC; 1146 dsc_regs.dip_ctrl_reg = VIDEO_DIP_CTL_B; 1147 dsc_regs.dip_pps_data_ctrl_reg = 1148 VIDEO_DIP_DRM_DATA_TRANSB_REG; 1149 dsc_type1 = PIPEB_DSC_0; 1150 dsc_type2 = PIPEB_DSC_1; 1151 break; 1152 default: 1153 return; 1154 } 1155 } else { 1156 DRM_ERROR("Func:%s Unsupported port:%d\n", __func__, type); 1157 } 1158 1159 intel_dsc_regs_init(encoder, &dsc_regs, dsc_type1); > 1160 configure_dsc_params_for_dsc_controller(encoder, pipe_config, 1161 &dsc_regs, dsc_type1); 1162 if (intel_dp->compr_params.dsc_cfg.num_vdsc_instances != 1) { 1163 intel_dsc_regs_init(encoder, &dsc_regs, dsc_type2); > 1164 configure_dsc_params_for_dsc_controller(encoder, pipe_config, --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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