[PATCH 0/5] drm/panel: panel-simple: Fix panel-dpi probe error

Thu Jun 26 09:38:40 UTC 2025

On Thu, Jun 26, 2025 at 11:35:12AM +0200, Francesco Dolcini wrote:
> On Thu, Jun 26, 2025 at 11:25:24AM +0200, Francesco Dolcini wrote:
> > On Wed, Jun 25, 2025 at 08:48:37AM +0200, Maxime Ripard wrote:
> > > Here's a series fixing (hopefully) the panel-simple regression for
> > > panels with a panel-dpi compatible.
> > > 
> > > It's only build tested, so if you could give that series a try
> > > Francesco, I'd really appreciate it.
> > 
> > It does not build for me, applied on top of commit ee88bddf7f2f ("Merge tag
> > 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf")
> > 
> >   SYNC    include/config/auto.conf.cmd
> >   CALL    scripts/checksyscalls.sh
> >   CC      drivers/gpu/drm/drm_of.o
> >   CC [M]  drivers/gpu/drm/panel/panel-simple.o
> >   AR      drivers/gpu/drm/built-in.a
> >   AR      drivers/gpu/built-in.a
> >   AR      drivers/built-in.a
> >   AR      built-in.a
> >   AR      vmlinux.a
> >   LD      vmlinux.o
> >   OBJCOPY modules.builtin.modinfo
> >   GEN     modules.builtin
> >   GEN     .vmlinux.objs
> >   MODPOST Module.symvers
> > ERROR: modpost: "mipi_dsi_bus_type" [drivers/gpu/drm/panel/panel-simple.ko] undefined!
> > make[2]: *** [scripts/Makefile.modpost:147: Module.symvers] Error 1
> > make[1]: *** [/home/francesco/Toradex/sources/linux/Makefile:1953: modpost] Error 2
> > make: *** [Makefile:248: __sub-make] Error 2
> > [Exit 2]
> > 
> 
> The issue is that I do not have CONFIG_DRM_MIPI_DSI. Adding it the build
> finishes, and it also fixes the issue.

Please find attached the defconfig that trigger this build issue. ARCH=arm, the
actual target I am testing on is an NXP i.MX6.

Francesco

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# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_KERNEL_LZ4=y
CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
CONFIG_GENERIC_IRQ_DEBUGFS=y
CONFIG_NO_HZ_IDLE=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_BPF_SYSCALL=y
CONFIG_BPF_JIT=y
CONFIG_PREEMPT=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_CGROUPS=y
CONFIG_MEMCG=y
CONFIG_BLK_CGROUP=y
CONFIG_CGROUP_SCHED=y
CONFIG_CFS_BANDWIDTH=y
CONFIG_CGROUP_PIDS=y
CONFIG_CPUSETS=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_CGROUP_BPF=y
CONFIG_CGROUP_MISC=y
CONFIG_NAMESPACES=y
CONFIG_USER_NS=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_SYSFS_SYSCALL=y
CONFIG_EXPERT=y
CONFIG_PROFILING=y
CONFIG_ARCH_MXC=y
CONFIG_SOC_IMX6Q=y
CONFIG_SOC_IMX6UL=y
CONFIG_SOC_IMX7D=y
CONFIG_SMP=y
CONFIG_ARM_PSCI=y
CONFIG_HIGHMEM=y
CONFIG_ARCH_FORCE_MAX_ORDER=13
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
CONFIG_CPUFREQ_DT=y
CONFIG_ARM_IMX6Q_CPUFREQ=y
CONFIG_ARM_IMX_CPUFREQ_DT=y
CONFIG_CPU_IDLE=y
CONFIG_ARM_CPUIDLE=y
CONFIG_ARM_PSCI_CPUIDLE=y
CONFIG_VFP=y
CONFIG_NEON=y
CONFIG_PM_DEBUG=y
CONFIG_PM_ADVANCED_DEBUG=y
CONFIG_ENERGY_MODEL=y
CONFIG_KPROBES=y
CONFIG_JUMP_LABEL=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODVERSIONS=y
CONFIG_BINFMT_MISC=m
# CONFIG_COMPAT_BRK is not set
CONFIG_CMA_DEBUGFS=y
CONFIG_CMA_SYSFS=y
CONFIG_CMA_AREAS=7
CONFIG_LRU_GEN=y
CONFIG_LRU_GEN_ENABLED=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
CONFIG_IPV6=m
CONFIG_NETFILTER=y
CONFIG_BRIDGE_NETFILTER=m
CONFIG_NF_CONNTRACK=m
CONFIG_IP_NF_IPTABLES=m
CONFIG_IP_NF_FILTER=m
CONFIG_IP_NF_TARGET_REJECT=m
CONFIG_IP_NF_NAT=m
CONFIG_IP_NF_TARGET_MASQUERADE=m
CONFIG_IP6_NF_IPTABLES=m
CONFIG_IP6_NF_FILTER=m
CONFIG_IP6_NF_TARGET_REJECT=m
CONFIG_IP6_NF_NAT=m
CONFIG_IP6_NF_TARGET_MASQUERADE=m
CONFIG_BRIDGE=m
CONFIG_BRIDGE_VLAN_FILTERING=y
CONFIG_VLAN_8021Q=m
CONFIG_VLAN_8021Q_GVRP=y
CONFIG_VLAN_8021Q_MVRP=y
CONFIG_CAN=m
CONFIG_BT=m
CONFIG_BT_RFCOMM=m
CONFIG_BT_BNEP=m
CONFIG_BT_HIDP=m
CONFIG_BT_HCIBTUSB=m
CONFIG_BT_HCIBTSDIO=m
CONFIG_BT_HCIUART=m
CONFIG_BT_HCIUART_MRVL=y
CONFIG_BT_MRVL=m
CONFIG_BT_MRVL_SDIO=m
CONFIG_BT_NXPUART=m
CONFIG_CFG80211=m
CONFIG_CFG80211_WEXT=y
CONFIG_MAC80211=m
CONFIG_RFKILL=m
CONFIG_RFKILL_GPIO=m
CONFIG_PCI=y
CONFIG_PCIEPORTBUS=y
CONFIG_PCIEAER=y
CONFIG_PCI_MSI=y
# CONFIG_VGA_ARB is not set
CONFIG_PCI_IMX6_HOST=y
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_IMX_WEIM=y
CONFIG_ARM_SCMI_PROTOCOL=y
CONFIG_MTD=y
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_CFI=y
CONFIG_MTD_JEDECPROBE=y
CONFIG_MTD_CFI_INTELEXT=y
CONFIG_MTD_CFI_AMDSTD=y
CONFIG_MTD_CFI_STAA=y
CONFIG_MTD_PHYSMAP=y
CONFIG_MTD_PHYSMAP_OF=y
CONFIG_MTD_RAW_NAND=y
CONFIG_MTD_NAND_GPMI_NAND=y
CONFIG_MTD_SPI_NOR=m
CONFIG_MTD_UBI=y
CONFIG_MTD_UBI_FASTMAP=y
CONFIG_MTD_UBI_BLOCK=y
CONFIG_BLK_DEV_LOOP=m
CONFIG_BLK_DEV_NVME=m
CONFIG_EEPROM_AT24=y
CONFIG_EEPROM_AT25=y
CONFIG_SCSI=y
CONFIG_BLK_DEV_SD=m
CONFIG_SCSI_CONSTANTS=y
CONFIG_ATA=m
# CONFIG_SATA_PMP is not set
CONFIG_SATA_AHCI=m
CONFIG_SATA_MOBILE_LPM_POLICY=0
CONFIG_AHCI_IMX=m
# CONFIG_ATA_SFF is not set
CONFIG_NETDEVICES=y
CONFIG_R8169=m
CONFIG_MICREL_PHY=y
CONFIG_CAN_FLEXCAN=m
CONFIG_CAN_MCP251X=m
CONFIG_CAN_MCP251XFD=m
CONFIG_USB_PEGASUS=m
CONFIG_USB_RTL8150=m
CONFIG_USB_RTL8152=m
CONFIG_USB_USBNET=m
CONFIG_USB_NET_DM9601=m
CONFIG_USB_NET_SR9800=m
CONFIG_USB_NET_SMSC75XX=m
CONFIG_USB_NET_SMSC95XX=m
CONFIG_USB_NET_PLUSB=m
CONFIG_USB_NET_MCS7830=m
CONFIG_ATH10K=m
CONFIG_ATH10K_PCI=m
CONFIG_ATH10K_SDIO=m
CONFIG_ATH11K=m
CONFIG_ATH11K_PCI=m
CONFIG_ATH12K=m
CONFIG_IWLWIFI=m
CONFIG_MWIFIEX=m
CONFIG_MWIFIEX_SDIO=m
CONFIG_MWIFIEX_PCIE=m
CONFIG_RTL8192CU=m
CONFIG_RTL8XXXU=m
CONFIG_INPUT_EVDEV=m
# CONFIG_KEYBOARD_ATKBD is not set
CONFIG_KEYBOARD_GPIO=m
CONFIG_KEYBOARD_GPIO_POLLED=m
CONFIG_KEYBOARD_SNVS_PWRKEY=m
CONFIG_KEYBOARD_IMX=m
# CONFIG_INPUT_MOUSE is not set
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_AD7879=m
CONFIG_TOUCHSCREEN_AD7879_I2C=m
CONFIG_TOUCHSCREEN_ATMEL_MXT=m
CONFIG_TOUCHSCREEN_STMPE=m
CONFIG_TOUCHSCREEN_COLIBRI_VF50=m
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_NR_UARTS=6
CONFIG_SERIAL_8250_RUNTIME_UARTS=6
CONFIG_SERIAL_OF_PLATFORM=y
CONFIG_SERIAL_IMX=y
CONFIG_SERIAL_IMX_CONSOLE=y
CONFIG_SERIAL_FSL_LPUART=y
CONFIG_SERIAL_FSL_LPUART_CONSOLE=y
CONFIG_RPMSG_TTY=m
CONFIG_SERIAL_DEV_BUS=y
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_GPIO=m
CONFIG_I2C_IMX=y
CONFIG_SPI=y
CONFIG_SPI_FSL_LPSPI=m
CONFIG_SPI_FSL_QUADSPI=m
CONFIG_SPI_IMX=m
CONFIG_SPI_SPIDEV=m
# CONFIG_PINCTRL_IMX8ULP is not set
CONFIG_GPIO_SYSFS=y
CONFIG_GPIO_MXC=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_GPIO=y
CONFIG_POWER_RESET_GPIO_RESTART=y
CONFIG_POWER_RESET_REGULATOR=y
CONFIG_POWER_RESET_SYSCON_POWEROFF=y
CONFIG_SENSORS_ARM_SCMI=y
CONFIG_SENSORS_GPIO_FAN=m
CONFIG_SENSORS_IIO_HWMON=m
CONFIG_SENSORS_LM75=m
CONFIG_SENSORS_PWM_FAN=m
CONFIG_SENSORS_AMC6821=m
CONFIG_SENSORS_INA2XX=m
CONFIG_THERMAL_STATISTICS=y
CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=10000
CONFIG_THERMAL_GOV_USER_SPACE=y
CONFIG_THERMAL_GOV_POWER_ALLOCATOR=y
CONFIG_CPU_THERMAL=y
CONFIG_IMX_THERMAL=y
CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_SYSFS=y
CONFIG_RN5T618_WATCHDOG=y
CONFIG_IMX2_WDT=y
CONFIG_MFD_RN5T618=y
CONFIG_MFD_STMPE=y
CONFIG_REGULATOR=y
CONFIG_REGULATOR_FIXED_VOLTAGE=y
CONFIG_REGULATOR_ANATOP=y
CONFIG_REGULATOR_GPIO=y
CONFIG_REGULATOR_PFUZE100=y
CONFIG_REGULATOR_RN5T618=y
CONFIG_MEDIA_SUPPORT=y
CONFIG_MEDIA_SUPPORT_FILTER=y
CONFIG_MEDIA_CAMERA_SUPPORT=y
CONFIG_MEDIA_PLATFORM_SUPPORT=y
CONFIG_MEDIA_USB_SUPPORT=y
CONFIG_USB_VIDEO_CLASS=m
CONFIG_V4L_PLATFORM_DRIVERS=y
CONFIG_V4L_MEM2MEM_DRIVERS=y
CONFIG_VIDEO_MUX=m
CONFIG_VIDEO_CODA=m
CONFIG_VIDEO_IMX7_CSI=m
CONFIG_VIDEO_IMX_MIPI_CSIS=m
CONFIG_VIDEO_IMX_PXP=m
CONFIG_VIDEO_OV5640=m
CONFIG_VIDEO_ADV7180=m
CONFIG_IMX_IPUV3_CORE=y
CONFIG_DRM=y
CONFIG_DRM_LOAD_EDID_FIRMWARE=y
CONFIG_DRM_PANEL_LVDS=m
CONFIG_DRM_PANEL_EDP=m
CONFIG_DRM_PANEL_SIMPLE=m
CONFIG_DRM_CDNS_MHDP8546=m
CONFIG_DRM_DW_HDMI_AHB_AUDIO=m
CONFIG_DRM_DW_HDMI_GP_AUDIO=m
CONFIG_DRM_DW_HDMI_CEC=m
CONFIG_DRM_IMX=y
CONFIG_DRM_IMX_PARALLEL_DISPLAY=y
CONFIG_DRM_IMX_TVE=y
CONFIG_DRM_IMX_LDB=y
CONFIG_DRM_IMX_HDMI=y
CONFIG_DRM_ETNAVIV=m
CONFIG_DRM_MXSFB=m
CONFIG_DRM_IMX_LCDIF=y
CONFIG_FB=y
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_PWM=m
CONFIG_BACKLIGHT_GPIO=m
CONFIG_LOGO=y
CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_SOC=y
CONFIG_SND_SOC_FSL_ASRC=m
CONFIG_SND_IMX_SOC=m
CONFIG_SND_SOC_IMX_SGTL5000=m
CONFIG_SND_SOC_FSL_ASOC_CARD=m
CONFIG_SND_SOC_IMX_AUDMIX=m
CONFIG_SND_SOC_IMX_HDMI=m
CONFIG_SND_SOC_SOF_TOPLEVEL=y
CONFIG_SND_SOC_SOF_OF=m
CONFIG_SND_SOC_SPDIF=m
CONFIG_SND_SOC_NAU8822=m
CONFIG_SND_SIMPLE_CARD=m
CONFIG_SND_AUDIO_GRAPH_CARD=m
CONFIG_SND_AUDIO_GRAPH_CARD2=m
CONFIG_UHID=m
CONFIG_HID_MULTITOUCH=m
CONFIG_USB_HIDDEV=y
CONFIG_USB_CONN_GPIO=m
CONFIG_USB=y
CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
CONFIG_USB_OTG=y
CONFIG_USB_MON=m
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_XHCI_PLATFORM=y
CONFIG_USB_EHCI_HCD=m
CONFIG_USB_ACM=m
CONFIG_USB_STORAGE=y
CONFIG_USB_UAS=m
CONFIG_USB_CHIPIDEA=m
CONFIG_USB_CHIPIDEA_UDC=y
CONFIG_USB_CHIPIDEA_HOST=y
CONFIG_USB_SERIAL=m
CONFIG_USB_SERIAL_OPTION=m
CONFIG_USB_TEST=m
CONFIG_USB_EHSET_TEST_FIXTURE=m
CONFIG_USB_HUB_USB251XB=m
CONFIG_USB_HSIC_USB3503=m
CONFIG_NOP_USB_XCEIV=m
CONFIG_USB_MXS_PHY=m
CONFIG_USB_GADGET=y
CONFIG_USB_CONFIGFS=y
CONFIG_USB_CONFIGFS_SERIAL=y
CONFIG_USB_CONFIGFS_ACM=y
CONFIG_USB_CONFIGFS_NCM=y
CONFIG_USB_CONFIGFS_ECM=y
CONFIG_USB_CONFIGFS_ECM_SUBSET=y
CONFIG_USB_CONFIGFS_EEM=y
CONFIG_USB_CONFIGFS_MASS_STORAGE=y
CONFIG_USB_CONFIGFS_F_LB_SS=y
CONFIG_USB_CONFIGFS_F_FS=y
CONFIG_USB_CONFIGFS_F_UAC1=y
CONFIG_USB_CONFIGFS_F_UAC2=y
CONFIG_USB_CONFIGFS_F_HID=y
CONFIG_USB_CONFIGFS_F_UVC=y
CONFIG_MMC=y
CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_PLTFM=y
CONFIG_MMC_SDHCI_ESDHC_IMX=y
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=m
CONFIG_LEDS_CLASS_MULTICOLOR=m
CONFIG_LEDS_GPIO=m
CONFIG_LEDS_PWM=m
CONFIG_LEDS_TRIGGERS=y
CONFIG_LEDS_TRIGGER_TIMER=m
CONFIG_LEDS_TRIGGER_DISK=y
CONFIG_LEDS_TRIGGER_HEARTBEAT=m
CONFIG_LEDS_TRIGGER_BACKLIGHT=m
CONFIG_LEDS_TRIGGER_DEFAULT_ON=m
CONFIG_LEDS_TRIGGER_PANIC=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_DRV_DS1307=y
CONFIG_RTC_DRV_MXC=m
CONFIG_RTC_DRV_SNVS=y
CONFIG_DMADEVICES=y
CONFIG_IMX_SDMA=m
CONFIG_MXS_DMA=y
CONFIG_STAGING=y
CONFIG_STAGING_MEDIA=y
CONFIG_VIDEO_IMX_MEDIA=m
CONFIG_HWSPINLOCK=y
CONFIG_IMX_MBOX=y
CONFIG_REMOTEPROC=y
CONFIG_REMOTEPROC_CDEV=y
CONFIG_IMX_REMOTEPROC=y
CONFIG_RPMSG_CHAR=m
CONFIG_RPMSG_CTRL=m
CONFIG_RPMSG_VIRTIO=m
CONFIG_EXTCON_USB_GPIO=y
CONFIG_IIO=y
CONFIG_IIO_SW_TRIGGER=m
CONFIG_IMX7D_ADC=m
CONFIG_STMPE_ADC=m
CONFIG_TI_ADS1015=m
CONFIG_VF610_ADC=m
CONFIG_IIO_RESCALE=m
CONFIG_IIO_MUX=m
CONFIG_IIO_HRTIMER_TRIGGER=m
CONFIG_IIO_INTERRUPT_TRIGGER=m
CONFIG_IIO_SYSFS_TRIGGER=m
CONFIG_PWM=y
CONFIG_PWM_FSL_FTM=m
CONFIG_PWM_IMX27=m
CONFIG_PHY_CAN_TRANSCEIVER=m
CONFIG_NVMEM_IMX_OCOTP=y
CONFIG_NVMEM_IMX_OCOTP_ELE=m
CONFIG_NVMEM_SNVS_LPGPR=m
CONFIG_TEE=m
CONFIG_OPTEE=m
CONFIG_MUX_GPIO=m
CONFIG_MUX_MMIO=m
CONFIG_EXT3_FS=m
CONFIG_EXT3_FS_POSIX_ACL=y
CONFIG_EXT3_FS_SECURITY=y
CONFIG_EXT4_FS=y
CONFIG_FANOTIFY=y
CONFIG_AUTOFS_FS=m
CONFIG_FUSE_FS=m
CONFIG_VFAT_FS=y
CONFIG_EXFAT_FS=y
CONFIG_NTFS3_FS=m
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_JFFS2_FS=m
CONFIG_UBIFS_FS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V2=y
CONFIG_NFS_V4=y
CONFIG_NFS_V4_1=y
CONFIG_NFS_V4_2=y
CONFIG_ROOT_NFS=y
CONFIG_NLS_DEFAULT="cp437"
CONFIG_NLS_CODEPAGE_437=m
CONFIG_NLS_ASCII=m
CONFIG_NLS_ISO8859_1=m
CONFIG_NLS_ISO8859_15=m
CONFIG_NLS_UTF8=m
CONFIG_LSM="landlock,lockdown,yama,loadpin,safesetid,bpf"
CONFIG_CRYPTO_NULL=m
CONFIG_CRYPTO_SHA256=y
CONFIG_CRYPTO_CRC32C=y
CONFIG_CRYPTO_DEV_FSL_CAAM=m
CONFIG_CRYPTO_DEV_MXS_DCP=m
CONFIG_CMA_SIZE_MBYTES=256
CONFIG_CMA_SIZE_PERCENTAGE=35
CONFIG_CMA_SIZE_SEL_MIN=y
CONFIG_PRINTK_TIME=y
CONFIG_DYNAMIC_DEBUG=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_FS=y
CONFIG_DEBUG_MEMORY_INIT=y
CONFIG_HARDLOCKUP_DETECTOR=y
# CONFIG_FTRACE is not set