tree: https://github.com/omap-audio/linux-audio peter/ti-linux-5.4.y/wip head: d4ea716deb5cae567d7ffb483c1cc6a18ca0d3ba commit: 3fabcb2e9b29dd1166640372b0abd5bbe2268198 [6196/9999] drm: bridge: Add support for Cadence MHDP DPI/DP bridge config: c6x-randconfig-r001-20200619 (attached as .config) compiler: c6x-elf-gcc (GCC) 9.3.0 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 git checkout 3fabcb2e9b29dd1166640372b0abd5bbe2268198 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=c6x If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): drivers/gpu/drm/bridge/cdns-mhdp-core.c: In function 'mhdp_irq_handler': 843 | u32 mbox_stat, apb_stat, sw_ev0, sw_ev1, sw_ev2, sw_ev3; | ^~~~~~ 843 | u32 mbox_stat, apb_stat, sw_ev0, sw_ev1, sw_ev2, sw_ev3; | ^~~~~~ 843 | u32 mbox_stat, apb_stat, sw_ev0, sw_ev1, sw_ev2, sw_ev3; | ^~~~~~ 843 | u32 mbox_stat, apb_stat, sw_ev0, sw_ev1, sw_ev2, sw_ev3; | ^~~~~~~~ 843 | u32 mbox_stat, apb_stat, sw_ev0, sw_ev1, sw_ev2, sw_ev3; | ^~~~~~~~~ drivers/gpu/drm/bridge/cdns-mhdp-core.c: In function 'cdns_mhdp_sst_enable': 1708 | u32 bpp, bpc, pxlfmt; | ^~~~~~ 1708 | u32 bpp, bpc, pxlfmt; | ^~~ vim +/sw_ev3 +843 drivers/gpu/drm/bridge/cdns-mhdp-core.c 839 840 static irqreturn_t mhdp_irq_handler(int irq, void *data) 841 { 842 struct cdns_mhdp_device *mhdp = (struct cdns_mhdp_device *)data; 844 bool bridge_attached; 845 846 apb_stat = readl(mhdp->regs + CDNS_APB_INT_STATUS); 847 mbox_stat = readl(mhdp->regs + CDNS_MB_INT_STATUS); 848 sw_ev0 = readl(mhdp->regs + CDNS_SW_EVENT0); 849 sw_ev1 = readl(mhdp->regs + CDNS_SW_EVENT1); 850 sw_ev2 = readl(mhdp->regs + CDNS_SW_EVENT2); 851 sw_ev3 = readl(mhdp->regs + CDNS_SW_EVENT3); 852 853 /* 854 * Calling drm_kms_helper_hotplug_event() when not attached 855 * to drm device causes an oops because the drm_bridge->dev 856 * is NULL. See mhdp_fw_cb() comments for details about the 857 * problems related drm_kms_helper_hotplug_event() call. 858 */ 859 spin_lock(&mhdp->start_lock); 860 bridge_attached = mhdp->bridge_attached; 861 spin_unlock(&mhdp->start_lock); 862 863 if (bridge_attached && (sw_ev0 & CDNS_DPTX_HPD)) { 864 mhdp_check_link(mhdp); 865 866 drm_kms_helper_hotplug_event(mhdp->bridge.dev); 867 } 868 869 return IRQ_HANDLED; 870 } 871 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org