stm32mp157 framebuffer support in new ST BS Release

[AZaki.2]

Hi,

 

when trying the new ST BSP release base on linux kernel 6.1.82 on my stm32mp157f-dk2 I noticed that the legacy framebuffer support is not working anymore.

this was working perfectly on the previous release with linux kernel 6.1.28.

I didn't succeed in getting it working again, here is a fragment of my linux kernel configuration:

 

CONFIG_DRM=y
CONFIG_DRM_STM=y
CONFIG_DRM_STM_DSI=y
CONFIG_DRM_PANEL_ORISETECH_OTM8009A=y
CONFIG_DRM_SII902X=y
CONFIG_FB=y
CONFIG_FB_SIMPLE=y
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_PWM=y
CONFIG_BACKLIGHT_GPIO=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
CONFIG_DRM_FBDEV_EMULATION=y
CONFIG_LOGO=y

can you please advice how to get it working again ?

 

I don't plan to use DRM.

 

Best regards

[Erwan SZYMANSKI]

Hello @AZaki.2 ,
Thank you for your feedback. Can you just precise me your way to test and validate or not if the feature works as I will certainly need to reproduce myself. 

Kind regards,
Erwan.

[AZaki.2]

hello,

 

a simple test is:

$ dd if=/dev/urandom of=/dev/fb0

you should get some nice noise image on the screen if framebuffer support is working

[AZaki.2]

here are some noticeable traces differences between :

 

Kernel 6.1.28:

root@stm32mp157f-dk2:~# dmesg | grep frame

[ 0.796661] simple-framebuffer ddc00000.framebuffer: framebuffer at 0xddc00000, 0xbb800 bytes

[ 0.796679] simple-framebuffer ddc00000.framebuffer: format=r5g6b5, mode=480x800x16, linelength=960

[ 0.814495] Console: switching to colour frame buffer device 100x30

[ 0.826962] simple-framebuffer ddc00000.framebuffer: fb0: simplefb registered!

[ 1.560870] Console: switching to colour frame buffer device 100x30

[ 1.577310] stm32-display 5a001000.display-controller: [drm] fb0: stmdrmfb frame buffer device

Kernel 6.1.82:

root@stm32mp157f-dk2:~# dmesg | grep frame

[ 0.755519] simple-framebuffer ddc00000.framebuffer: framebuffer at 0xddc00000, 0xbb800 bytes

[ 0.755537] simple-framebuffer ddc00000.framebuffer: format=r5g6b5, mode=480x800x16, linelength=960

[ 0.772917] Console: switching to colour frame buffer device 100x30

[ 0.785382] simple-framebuffer ddc00000.framebuffer: fb0: simplefb registered!

[Erwan SZYMANSKI]

Hello @AZaki.2 ,
I ask myself if this is not due to the continuous display features. Can you remove the default-on property from your Linux device tree on ltdc ? 

Kind regards,
Erwan.

[AZaki.2]

I tried it yesterday already by reverting this commit:

 

https://github.com/STMicroelectronics/linux/commit/c1c0bc827fabea1c73b7dee71b90e7cdef5c9290

 

But it didn't change anything.

[AZaki.2]

I did some more test and it looks like the framebuffer isn't working reliably anymore.

I don't see in the dmesg any errors.

I did multiple reboot/reset of the stm32mp157f-dk2 and sometimes it's not working (system is up but no frambuffer , somtimes it hangs completely), this never happened with previous release.

 

 

here is my kernel config:

 

# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
CONFIG_USELIB=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_BPF_SYSCALL=y
CONFIG_PREEMPT=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=16
CONFIG_CGROUPS=y
CONFIG_MEMCG=y
CONFIG_BLK_CGROUP=y
CONFIG_CGROUP_SCHED=y
CONFIG_CFS_BANDWIDTH=y
CONFIG_RT_GROUP_SCHED=y
CONFIG_CGROUP_PIDS=y
CONFIG_CGROUP_RDMA=y
CONFIG_CGROUP_FREEZER=y
CONFIG_CPUSETS=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_CGROUP_PERF=y
CONFIG_CGROUP_BPF=y
CONFIG_USER_NS=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_PERF_EVENTS=y
CONFIG_ARCH_STM32=y
CONFIG_ARM_THUMBEE=y
# CONFIG_CACHE_L2X0 is not set
CONFIG_ARM_ERRATA_430973=y
CONFIG_ARM_ERRATA_720789=y
CONFIG_ARM_ERRATA_754322=y
CONFIG_ARM_ERRATA_754327=y
CONFIG_ARM_ERRATA_764369=y
CONFIG_ARM_ERRATA_775420=y
CONFIG_ARM_ERRATA_798181=y
CONFIG_SMP=y
CONFIG_MCPM=y
CONFIG_HIGHMEM=y
# CONFIG_ATAGS is not set
CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_VFP=y
CONFIG_NEON=y
CONFIG_KERNEL_MODE_NEON=y
# CONFIG_GCC_PLUGINS is not set
CONFIG_MODULES=y
CONFIG_MODULE_SIG=y
CONFIG_MODULE_SIG_FORCE=y
CONFIG_MODULE_SIG_SHA256=y
CONFIG_MODULE_SIG_KEY_TYPE_ECDSA=y
CONFIG_MODULE_SIG_KEY="modsign_key.pem"
CONFIG_BLK_DEV_THROTTLING=y
CONFIG_BLK_CGROUP_IOCOST=y
CONFIG_PARTITION_ADVANCED=y
CONFIG_CMDLINE_PARTITION=y
CONFIG_BINFMT_MISC=y
CONFIG_CMA=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
CONFIG_IP_PNP_RARP=y
# CONFIG_IPV6 is not set
CONFIG_NETFILTER=y
CONFIG_NF_CONNTRACK=y
CONFIG_NF_CT_NETLINK=y
CONFIG_NF_TABLES=y
CONFIG_NFT_CT=y
CONFIG_NFT_CONNLIMIT=y
CONFIG_NFT_LOG=y
CONFIG_NFT_LIMIT=y
CONFIG_NFT_MASQ=y
CONFIG_NFT_REDIR=y
CONFIG_NFT_REJECT=y
CONFIG_NETFILTER_XT_TARGET_CLASSIFY=y
CONFIG_NETFILTER_XT_TARGET_CONNMARK=y
CONFIG_NETFILTER_XT_TARGET_HMARK=y
CONFIG_NETFILTER_XT_TARGET_IDLETIMER=y
CONFIG_NETFILTER_XT_TARGET_LOG=y
CONFIG_NETFILTER_XT_TARGET_MARK=y
CONFIG_NETFILTER_XT_TARGET_REDIRECT=y
CONFIG_NETFILTER_XT_MATCH_CONNLABEL=y
CONFIG_NETFILTER_XT_MATCH_CONNLIMIT=y
CONFIG_NETFILTER_XT_MATCH_CONNMARK=y
CONFIG_NETFILTER_XT_MATCH_CONNTRACK=y
CONFIG_NETFILTER_XT_MATCH_CPU=y
CONFIG_NETFILTER_XT_MATCH_IPRANGE=y
CONFIG_NETFILTER_XT_MATCH_LENGTH=y
CONFIG_NETFILTER_XT_MATCH_LIMIT=y
CONFIG_NETFILTER_XT_MATCH_MAC=y
CONFIG_NETFILTER_XT_MATCH_MARK=y
CONFIG_NETFILTER_XT_MATCH_MULTIPORT=y
CONFIG_NETFILTER_XT_MATCH_OWNER=y
CONFIG_NETFILTER_XT_MATCH_QUOTA=y
CONFIG_NETFILTER_XT_MATCH_SOCKET=y
CONFIG_NETFILTER_XT_MATCH_STATE=y
CONFIG_NETFILTER_XT_MATCH_STRING=y
CONFIG_NETFILTER_XT_MATCH_TIME=y
CONFIG_NETFILTER_XT_MATCH_U32=y
CONFIG_NF_REJECT_IPV4=y
CONFIG_IP_NF_IPTABLES=y
CONFIG_IP_NF_FILTER=y
CONFIG_IP_NF_NAT=y
CONFIG_IP_NF_TARGET_MASQUERADE=y
CONFIG_BRIDGE=y
CONFIG_CFG80211=y
CONFIG_MAC80211=y
CONFIG_RFKILL=y
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_ARM_SCMI_PROTOCOL=y
CONFIG_MTD=y
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_RAW_NAND=y
CONFIG_MTD_NAND_STM32_FMC2=y
CONFIG_MTD_SPI_NAND=y
CONFIG_MTD_SPI_NOR=y
CONFIG_MTD_UBI=y
CONFIG_MTD_UBI_FASTMAP=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=65536
CONFIG_SRAM=y
CONFIG_EEPROM_AT24=y
CONFIG_EEPROM_93CX6=y
CONFIG_SCSI=y
CONFIG_BLK_DEV_SD=y
CONFIG_BLK_DEV_SR=y
CONFIG_CHR_DEV_SG=y
CONFIG_ATA=y
CONFIG_SATA_AHCI_PLATFORM=y
CONFIG_MD=y
CONFIG_BLK_DEV_DM=y
CONFIG_DM_VERITY=y
CONFIG_NETDEVICES=y
CONFIG_TUN=y
CONFIG_SMSC911X=y
CONFIG_STMMAC_ETH=y
CONFIG_DWMAC_DWC_QOS_ETH=y
CONFIG_BROADCOM_PHY=y
CONFIG_ICPLUS_PHY=y
CONFIG_MARVELL_PHY=y
CONFIG_MDIO_BITBANG=y
CONFIG_USB_USBNET=y
# CONFIG_WLAN_VENDOR_ADMTEK is not set
# CONFIG_WLAN_VENDOR_ATH is not set
# CONFIG_WLAN_VENDOR_ATMEL is not set
CONFIG_B43=y
CONFIG_B43_SDIO=y
CONFIG_B43LEGACY=y
CONFIG_BRCMFMAC=m
# CONFIG_WLAN_VENDOR_MARVELL is not set
# CONFIG_WLAN_VENDOR_MEDIATEK is not set
# CONFIG_WLAN_VENDOR_MICROCHIP is not set
# CONFIG_WLAN_VENDOR_RALINK is not set
# CONFIG_WLAN_VENDOR_REALTEK is not set
# CONFIG_WLAN_VENDOR_RSI is not set
# CONFIG_WLAN_VENDOR_ST is not set
# CONFIG_WLAN_VENDOR_TI is not set
# CONFIG_WLAN_VENDOR_ZYDAS is not set
# CONFIG_WLAN_VENDOR_QUANTENNA is not set
CONFIG_INPUT_JOYDEV=y
CONFIG_INPUT_EVDEV=y
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_EDT_FT5X06=y
CONFIG_TOUCHSCREEN_STMPE=y
CONFIG_INPUT_MISC=y
CONFIG_INPUT_STPMIC1_ONKEY=y
CONFIG_SERIAL_STM32=y
CONFIG_SERIAL_STM32_CONSOLE=y
CONFIG_RPMSG_TTY=y
CONFIG_SERIAL_DEV_BUS=y
CONFIG_TCG_TPM=y
CONFIG_TCG_TIS=y
CONFIG_TCG_TIS_ST33ZP24_I2C=y
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_STM32F7=y
CONFIG_SPI=y
CONFIG_SPI_STM32=y
CONFIG_SPI_STM32_QSPI=y
CONFIG_SPI_SPIDEV=y
CONFIG_PINCTRL_SINGLE=y
CONFIG_PINCTRL_STMFX=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_GPIO=y
CONFIG_POWER_RESET_GPIO_RESTART=y
CONFIG_POWER_RESET_SYSCON=y
CONFIG_POWER_RESET_SYSCON_POWEROFF=y
CONFIG_SYSCON_REBOOT_MODE=y
CONFIG_THERMAL=y
CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_NOWAYOUT=y
CONFIG_ARM_SMC_WATCHDOG=y
CONFIG_STPMIC1_WATCHDOG=y
CONFIG_MFD_STM32_LPTIMER=y
CONFIG_MFD_STPMIC1=y
CONFIG_REGULATOR=y
CONFIG_REGULATOR_DEBUG=y
CONFIG_REGULATOR_FIXED_VOLTAGE=y
CONFIG_REGULATOR_USERSPACE_CONSUMER=y
CONFIG_REGULATOR_GPIO=y
CONFIG_REGULATOR_STM32_VREFBUF=y
CONFIG_REGULATOR_STM32_PWR=y
CONFIG_REGULATOR_STPMIC1=y
CONFIG_REGULATOR_VCTRL=y
CONFIG_DRM=y
CONFIG_DRM_MIPI_DSI=y
CONFIG_DRM_KMS_HELPER=y
CONFIG_DRM_FBDEV_EMULATION=y
CONFIG_DRM_DP_AUX_BUS=y
CONFIG_DRM_DISPLAY_HELPER=y
CONFIG_DRM_DISPLAY_DP_HELPER=y
CONFIG_DRM_DISPLAY_HDMI_HELPER=y
CONFIG_DRM_GEM_DMA_HELPER=y
CONFIG_DRM_GEM_SHMEM_HELPER=y
CONFIG_DRM_EXYNOS_FIMD=y
CONFIG_DRM_EXYNOS_MIXER=y
CONFIG_DRM_EXYNOS_DPI=y
CONFIG_DRM_EXYNOS_DSI=y
CONFIG_DRM_EXYNOS_DP=y
CONFIG_DRM_EXYNOS_HDMI=y
CONFIG_DRM_RCAR_USE_LVDS=y
CONFIG_DRM_RCAR_USE_MIPI_DSI=y
CONFIG_DRM_STM=y
CONFIG_DRM_STM_DSI=y
CONFIG_DRM_PANEL=y
CONFIG_DRM_PANEL_SIMPLE=y
CONFIG_DRM_PANEL_EDP=y
CONFIG_DRM_PANEL_ORISETECH_OTM8009A=y
CONFIG_DRM_BRIDGE=y
CONFIG_DRM_PANEL_BRIDGE=y
CONFIG_DRM_DISPLAY_CONNECTOR=y
CONFIG_DRM_SII902X=y
CONFIG_DRM_I2C_ADV7511=y
CONFIG_DRM_I2C_ADV7511_AUDIO=y
CONFIG_DRM_I2C_ADV7511_CEC=y
CONFIG_DRM_DW_MIPI_DSI=y
CONFIG_DRM_ETNAVIV_THERMAL=y
CONFIG_DRM_SIMPLEDRM=y
CONFIG_DRM_LEGACY=y
CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=y
CONFIG_DRM_NOMODESET=y
CONFIG_FB=y
CONFIG_FB_CMDLINE=y
CONFIG_FB_NOTIFY=y
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
CONFIG_FB_SYS_FILLRECT=y
CONFIG_FB_SYS_COPYAREA=y
CONFIG_FB_SYS_IMAGEBLIT=y
CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA=y
CONFIG_FB_SYS_FOPS=y
CONFIG_FB_DEFERRED_IO=y
CONFIG_FB_MODE_HELPERS=y
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_PWM=y
CONFIG_BACKLIGHT_GPIO=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
CONFIG_LOGO=y
CONFIG_USB_CONN_GPIO=y
CONFIG_USB=y
CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
CONFIG_USB_OTG=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_XHCI_PLATFORM=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_ROOT_HUB_TT=y
CONFIG_USB_EHCI_HCD_PLATFORM=y
CONFIG_USB_OHCI_HCD=y
CONFIG_USB_OHCI_HCD_PLATFORM=y
CONFIG_USB_ACM=y
CONFIG_USB_STORAGE=y
CONFIG_USB_UAS=y
CONFIG_USBIP_CORE=y
CONFIG_USBIP_HOST=y
CONFIG_USB_DWC2=y
CONFIG_USB_DWC2_PERIPHERAL=y
CONFIG_USB_SERIAL=y
CONFIG_USB_SERIAL_CONSOLE=y
CONFIG_USB_SERIAL_OPTION=y
CONFIG_USB_HSIC_USB3503=y
CONFIG_USB_GPIO_VBUS=y
CONFIG_USB_ISP1301=y
CONFIG_USB_ULPI=y
CONFIG_USB_GADGET=y
CONFIG_USB_G_SERIAL=y
CONFIG_MMC=y
CONFIG_MMC_BLOCK_MINORS=16
CONFIG_MMC_ARMMMCI=y
CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_PLTFM=y
CONFIG_MMC_DW=y
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=y
CONFIG_LEDS_GPIO=y
CONFIG_LEDS_PWM=y
CONFIG_LEDS_TRIGGERS=y
CONFIG_LEDS_TRIGGER_TIMER=y
CONFIG_LEDS_TRIGGER_ONESHOT=y
CONFIG_LEDS_TRIGGER_HEARTBEAT=y
CONFIG_LEDS_TRIGGER_BACKLIGHT=y
CONFIG_LEDS_TRIGGER_CPU=y
CONFIG_LEDS_TRIGGER_GPIO=y
CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
CONFIG_LEDS_TRIGGER_TRANSIENT=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_DRV_STM32=y
CONFIG_DMADEVICES=y
CONFIG_STM32_DMA=y
CONFIG_STM32_DMAMUX=y
CONFIG_STM32_MDMA=y
# CONFIG_VIRTIO_MENU is not set
CONFIG_COMMON_CLK_SCMI=y
CONFIG_HWSPINLOCK=y
CONFIG_HWSPINLOCK_STM32=y
CONFIG_STM32_IPCC=y
CONFIG_REMOTEPROC=y
CONFIG_STM32_RPROC=y
CONFIG_RPMSG_VIRTIO=y
CONFIG_MEMORY=y
CONFIG_STM32_FMC2_EBI=y
CONFIG_IIO=y
CONFIG_IIO_SW_TRIGGER=y
CONFIG_SD_ADC_MODULATOR=y
CONFIG_STM32_ADC_CORE=y
CONFIG_STM32_ADC=y
CONFIG_STM32_DFSDM_ADC=y
CONFIG_STM32_DAC=y
CONFIG_IIO_HRTIMER_TRIGGER=y
CONFIG_IIO_STM32_LPTIMER_TRIGGER=y
CONFIG_PWM=y
CONFIG_PWM_STM32=y
CONFIG_PWM_STM32_LP=y
CONFIG_PHY_STM32_USBPHYC=y
CONFIG_NVMEM_STM32_ROMEM=y
CONFIG_TEE=y
CONFIG_OPTEE=y
CONFIG_COUNTER=y
CONFIG_STM32_LPTIMER_CNT=y
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
CONFIG_FS_ENCRYPTION=y
CONFIG_FS_VERITY=y
CONFIG_AUTOFS4_FS=y
CONFIG_FUSE_FS=y
CONFIG_OVERLAY_FS=y
# CONFIG_OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW is not set
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_UBIFS_FS=y
CONFIG_SQUASHFS=y
CONFIG_SQUASHFS_LZO=y
CONFIG_SQUASHFS_XZ=y
CONFIG_PSTORE=y
CONFIG_PSTORE_CONSOLE=y
CONFIG_PSTORE_PMSG=y
CONFIG_PSTORE_RAM=y
CONFIG_SYSV_FS=y
# CONFIG_NETWORK_FILESYSTEMS is not set
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_CODEPAGE_852=y
CONFIG_NLS_ASCII=y
CONFIG_NLS_ISO8859_1=y
CONFIG_NLS_ISO8859_15=y
CONFIG_TRUSTED_KEYS=y
CONFIG_ENCRYPTED_KEYS=y
CONFIG_CRYPTO_USER=y
CONFIG_CRYPTO_AUTHENC=y
CONFIG_CRYPTO_ECDH=y
CONFIG_CRYPTO_SEQIV=y
CONFIG_CRYPTO_ECHAINIV=y
CONFIG_CRYPTO_USER_API_HASH=y
CONFIG_CRYPTO_USER_API_SKCIPHER=y
CONFIG_CRYPTO_USER_API_RNG=y
CONFIG_CRYPTO_USER_API_AEAD=y
CONFIG_CRYPTO_GHASH_ARM_CE=y
CONFIG_CRYPTO_SHA1_ARM_NEON=y
CONFIG_CRYPTO_SHA1_ARM_CE=y
CONFIG_CRYPTO_SHA2_ARM_CE=y
CONFIG_CRYPTO_SHA512_ARM=y
CONFIG_CRYPTO_AES_ARM=y
CONFIG_CRYPTO_AES_ARM_BS=y
CONFIG_CRYPTO_AES_ARM_CE=y
CONFIG_CRYPTO_CHACHA20_NEON=y
CONFIG_CRYPTO_CRC32_ARM_CE=y
CONFIG_CRYPTO_DEV_STM32_CRC=y
CONFIG_CRYPTO_DEV_STM32_HASH=y
CONFIG_CRYPTO_DEV_STM32_CRYP=y
CONFIG_CRC_CCITT=y
CONFIG_DMA_CMA=y
CONFIG_CMA_SIZE_MBYTES=128
CONFIG_PRINTK_TIME=y
CONFIG_DEBUG_FS=y
# CONFIG_RUNTIME_TESTING_MENU is not set
CONFIG_AUDIT=y