fbtft does not work on kernel 5.2.0 and above

[alexandref75]

A fbtft, more specifically a pitft 2.8" resistive (uses the fb_ili9340 driver does not work with kernels 5.2.0 and above. Images do not appear on the display.

Describe the bug Changes to internal kernel API of gpiod invalidates that way that fbtft identifies the GPIO pins. Without the dc-gpio pin, the SPI interface to the display does not work.

To reproduce Connect a fbtft display that uses GPIO pins and boot a 5.2.X kernel or above, use the following command to present an image at the display: fbi -T 2 -d /dev/fb1 -noverbose -a adapiluv320x240.jpg

Expected behaviour An framebuffer that presents the image at the display.

Actual behaviour The backlight and the display remain off and no image is shown.

System pi@raspberrypi1:~ $ raspinfo System Information

Raspberry Pi Model B Rev 2 PRETTY_NAME="Raspbian GNU/Linux 10 (buster)" NAME="Raspbian GNU/Linux" VERSION_ID="10" VERSION="10 (buster)"

Raspberry Pi reference 2019-06-20 Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 150e25c4f8123a4c9c63e8dca1b4737fa6c1135c, stage2

Linux raspberrypi1 5.2.6+ #23 Tue Aug 13 21:00:43 CDT 2019 armv6l GNU/Linux Hardware : BCM2835 Revision : 000e Serial : 000000008ceda0f9 Throttled flag : throttled=0x0 Camera : supported=0 detected=0

Videocore information

Jul 9 2019 14:40:53 Copyright (c) 2012 Broadcom version 6c3fe3f096a93de3b34252ad98cdccadeb534be2 (clean) (release) (start)

alloc failures: 0 compactions: 0 legacy block fails: 0

Filesystem information

Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 7429824 1686896 5408336 24% / devtmpfs 217628 0 217628 0% /dev tmpfs 221960 0 221960 0% /dev/shm tmpfs 221960 3092 218868 2% /run tmpfs 5120 0 5120 0% /run/lock tmpfs 221960 0 221960 0% /sys/fs/cgroup /dev/mmcblk0p1 258096 44152 213944 18% /boot tmpfs 44392 0 44392 0% /run/user/1000

Filename Type Size Used Priority /var/swap file 102396 0 -2

Package version information

raspberrypi-ui-mods: Installed: (none) raspberrypi-sys-mods: Installed: 20190730 openbox: Installed: (none) lxpanel: Installed: (none) pcmanfm: Installed: (none) rpd-plym-splash: Installed: (none)

Networking Information

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet x.x.x.x netmask x.x.x.x broadcast x.x.x.x inet6 y::y.y.y.y prefixlen 64 scopeid 0x20 ether m.m.m.m txqueuelen 1000 (Ethernet) RX packets 271 bytes 18417 (17.9 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 287 bytes 58019 (56.6 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet x.x.x.x netmask x.x.x.x inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1000 (Local Loopback) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

USB Information

/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M | Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M | Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M

config.txt

aphy_params_current=547 audio_pwm_mode=514 config_hdmi_boost=2 disable_auto_turbo=1 disable_commandline_tags=2 display_hdmi_rotate=-1 display_lcd_rotate=-1 dphy_params_current=547 enable_uart=1 force_pwm_open=1 framebuffer_ignore_alpha=1 framebuffer_swap=1 ignore_lcd=1 init_uart_clock=0x2dc6c00 pause_burst_frames=1 program_serial_random=1 hdmi_force_cec_address:0=65535 hdmi_force_cec_address:1=65535 hdmi_pixel_freq_limit:0=0x9a7ec80 hdmi_pixel_freq_limit:1=0x9a7ec80 device_tree=- kernel=kernel-5.2.6.img hdmi_cvt:0= hdmi_cvt:1= hdmi_edid_filename:0= hdmi_edid_filename:1= hdmi_timings:0= hdmi_timings:1=

cmdline.txt

coherent_pool=1M bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=PARTUUID=93d699ac-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait

raspi-gpio settings

BANK0 (GPIO 0 to 27): GPIO 0: level=1 fsel=4 alt=0 func=SDA0 GPIO 1: level=1 fsel=4 alt=0 func=SCL0 GPIO 2: level=1 fsel=4 alt=0 func=SDA1 GPIO 3: level=1 fsel=4 alt=0 func=SCL1 GPIO 4: level=1 fsel=0 func=INPUT GPIO 5: level=0 fsel=1 func=OUTPUT GPIO 6: level=1 fsel=1 func=OUTPUT GPIO 7: level=1 fsel=1 func=OUTPUT GPIO 8: level=1 fsel=1 func=OUTPUT GPIO 9: level=0 fsel=4 alt=0 func=SPI0_MISO GPIO 10: level=0 fsel=4 alt=0 func=SPI0_MOSI GPIO 11: level=0 fsel=4 alt=0 func=SPI0_SCLK GPIO 12: level=0 fsel=0 func=INPUT GPIO 13: level=0 fsel=0 func=INPUT GPIO 14: level=1 fsel=4 alt=0 func=TXD0 GPIO 15: level=1 fsel=4 alt=0 func=RXD0 GPIO 16: level=1 fsel=1 func=OUTPUT GPIO 17: level=0 fsel=0 func=INPUT GPIO 18: level=0 fsel=0 func=INPUT GPIO 19: level=0 fsel=0 func=INPUT GPIO 20: level=0 fsel=0 func=INPUT GPIO 21: level=0 fsel=1 func=OUTPUT GPIO 22: level=0 fsel=0 func=INPUT GPIO 23: level=0 fsel=0 func=INPUT GPIO 24: level=1 fsel=0 func=INPUT GPIO 25: level=0 fsel=0 func=INPUT GPIO 26: level=0 fsel=0 func=INPUT GPIO 27: level=0 fsel=0 func=INPUT BANK1 (GPIO 28 to 45): GPIO 28: level=0 fsel=0 func=INPUT GPIO 29: level=0 fsel=0 func=INPUT GPIO 30: level=0 fsel=0 func=INPUT GPIO 31: level=0 fsel=0 func=INPUT GPIO 32: level=0 fsel=0 func=INPUT GPIO 33: level=0 fsel=0 func=INPUT GPIO 34: level=1 fsel=0 func=INPUT GPIO 35: level=1 fsel=0 func=INPUT GPIO 36: level=1 fsel=0 func=INPUT GPIO 37: level=0 fsel=0 func=INPUT GPIO 38: level=0 fsel=0 func=INPUT GPIO 39: level=0 fsel=0 func=INPUT GPIO 40: level=0 fsel=4 alt=0 func=PWM0 GPIO 41: level=0 fsel=0 func=INPUT GPIO 42: level=0 fsel=0 func=INPUT GPIO 43: level=0 fsel=0 func=INPUT GPIO 44: level=0 fsel=0 func=INPUT GPIO 45: level=0 fsel=4 alt=0 func=PWM1 BANK2 (GPIO 46 to 53): GPIO 46: level=1 fsel=0 func=INPUT GPIO 47: level=0 fsel=0 func=INPUT GPIO 48: level=0 fsel=4 alt=0 func=SD0_CLK GPIO 49: level=1 fsel=4 alt=0 func=SD0_CMD GPIO 50: level=1 fsel=4 alt=0 func=SD0_DAT0 GPIO 51: level=1 fsel=4 alt=0 func=SD0_DAT1 GPIO 52: level=1 fsel=4 alt=0 func=SD0_DAT2 GPIO 53: level=1 fsel=4 alt=0 func=SD0_DAT3

vcdbg log messages

001178.330: brfs: File read: /mfs/sd/config.txt 001178.889: brfs: File read: 778 bytes 001261.995: brfs: File read: /mfs/sd/config.txt 001262.546: gpioman: gpioman_get_pin_num: pin LEDS_PWR_OK not defined 001272.392: gpioman: gpioman_get_pin_num: pin WL_LPO_CLK not defined 001272.465: gpioman: gpioman_get_pin_num: pin BT_ON not defined 001272.529: gpioman: gpioman_get_pin_num: pin WL_ON not defined 001444.850: gpioman: gpioman_get_pin_num: pin LEDS_PWR_OK not defined 001444.945: *** Restart logging 001445.007: brfs: File read: 778 bytes 001478.181: hdmi: HDMI:hdmi_get_state is deprecated, use hdmi_get_display_state instead 001480.430: brfs: File read: /mfs/sd/cmdline.txt 001480.507: Read command line from file 'cmdline.txt': 001480.564: 'dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=PARTUUID=93d699ac-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait' 001480.876: brfs: File read: 142 bytes 001831.256: brfs: File read: /mfs/sd/kernel-5.2.6.img 001831.324: Loading 'kernel-5.2.6.img' to 0x8000 size 0x4b5bf0 001831.422: No kernel trailer - assuming DT-capable 001831.514: brfs: File read: 4938736 bytes 001835.300: brfs: File read: /mfs/sd/bcm2708-rpi-b.dtb 001835.366: Loading 'bcm2708-rpi-b.dtb' to 0x4bdbf0 size 0x5dcd 001926.007: brfs: File read: 24013 bytes 001927.885: brfs: File read: /mfs/sd/config.txt 001928.099: dtparam: spi=on 001937.597: dtparam: i2c1=on 001948.739: dtparam: i2c_arm=on 001959.773: brfs: File read: 778 bytes 001971.873: brfs: File read: /mfs/sd/overlays/pitft28-resistive.dtbo 001990.894: Loaded overlay 'pitft28-resistive' 001990.953: dtparam: rotate=90 001992.065: dtparam: speed=64000000 001993.168: dtparam: fps=30 003770.129: gpioman: gpioman_get_pin_num: pin EMMC_ENABLE not defined 003794.010: Device tree loaded to 0x1bfe9a00 (size 0x65d8) 003795.515: gpioman: gpioman_get_pin_num: pin SDCARD_CONTROL_POWER not defined 006888.288: vchiq_core: vchiq_init_state: slot_zero = 0x5b580000, is_master = 1 006894.573: hdmi: HDMI:hdmi_get_state is deprecated, use hdmi_get_display_state instead 006901.599: TV service:host side not connected, dropping notification 0x00000002, 0x00000001, 0x00000010 023794.826: brfs: File read: 2746 bytes

dmesg log

[ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 5.2.6+ (alexandr@alexandre-main) (gcc version 8.3.0 (GNU Toolchain for the A-profile Architecture 8.3-2019.03 (arm-rel-8.36))) #23 Tue Aug 13 21:00:43 CDT 2019 [ 0.000000] CPU: ARMv6-compatible processor [410fb767] revision 7 (ARMv7), cr=00c5387d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache [ 0.000000] OF: fdt: Machine model: Raspberry Pi Model B Rev 2 [ 0.000000] Memory policy: Data cache writeback [ 0.000000] cma: Reserved 8 MiB at 0x1b400000 [ 0.000000] On node 0 totalpages: 114688 [ 0.000000] Normal zone: 896 pages used for memmap [ 0.000000] Normal zone: 0 pages reserved [ 0.000000] Normal zone: 114688 pages, LIFO batch:31 [ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768 [ 0.000000] pcpu-alloc: [0] 0 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 113792 [ 0.000000] Kernel command line: coherent_pool=1M bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=PARTUUID=93d699ac-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait [ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes) [ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes) [ 0.000000] Memory: 435260K/458752K available (6996K kernel code, 642K rwdata, 2232K rodata, 468K init, 797K bss, 15300K reserved, 8192K cma-reserved) [ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] ftrace: allocating 25187 entries in 50 pages [ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 [ 0.000000] random: get_random_bytes called from start_kernel+0x2ac/0x4b4 with crng_init=0 [ 0.000025] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps every 2147483647500ns [ 0.000079] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275 ns [ 0.000199] bcm2835: system timer (irq = 27) [ 0.000625] Console: colour dummy device 80x30 [ 0.001103] printk: console [tty1] enabled [ 0.001197] Calibrating delay loop... 697.95 BogoMIPS (lpj=3489792) [ 0.050391] pid_max: default: 32768 minimum: 301 [ 0.050899] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.050965] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.052430] CPU: Testing write buffer coherency: ok [ 0.054095] Setting up static identity map for 0x8200 - 0x8238 [ 0.055407] devtmpfs: initialized [ 0.068395] VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 5 [ 0.068902] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.068988] futex hash table entries: 256 (order: -1, 3072 bytes) [ 0.070310] pinctrl core: initialized pinctrl subsystem [ 0.072245] NET: Registered protocol family 16 [ 0.076677] DMA: preallocated 1024 KiB pool for atomic coherent allocations [ 0.084425] hw-breakpoint: found 6 breakpoint and 1 watchpoint registers. [ 0.084501] hw-breakpoint: maximum watchpoint size is 4 bytes. [ 0.084701] Serial: AMBA PL011 UART driver [ 0.090225] bcm2835-mbox 2000b880.mailbox: mailbox enabled [ 0.151211] bcm2835-dma 20007000.dma: DMA legacy API manager at (ptrval), dmachans=0x1 [ 0.154310] SCSI subsystem initialized [ 0.154641] usbcore: registered new interface driver usbfs [ 0.154792] usbcore: registered new interface driver hub [ 0.155073] usbcore: registered new device driver usb [ 0.171097] raspberrypi-firmware soc:firmware: Attached to firmware from 2019-07-09 14:40, variant start [ 0.181116] raspberrypi-firmware soc:firmware: Firmware hash is 6c3fe3f096a93de3b34252ad98cdccadeb534be2 [ 0.193663] clocksource: Switched to clocksource timer [ 1.400098] VFS: Disk quotas dquot_6.6.0 [ 1.400284] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) [ 1.400664] FS-Cache: Loaded [ 1.401093] CacheFiles: Loaded [ 1.421158] NET: Registered protocol family 2 [ 1.422629] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes) [ 1.422737] TCP established hash table entries: 4096 (order: 2, 16384 bytes) [ 1.422846] TCP bind hash table entries: 4096 (order: 2, 16384 bytes) [ 1.422946] TCP: Hash tables configured (established 4096 bind 4096) [ 1.423154] UDP hash table entries: 256 (order: 0, 4096 bytes) [ 1.423226] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) [ 1.423869] NET: Registered protocol family 1 [ 1.425168] RPC: Registered named UNIX socket transport module. [ 1.425235] RPC: Registered udp transport module. [ 1.425269] RPC: Registered tcp transport module. [ 1.425299] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 1.426708] hw perfevents: no irqs for PMU, sampling events not supported [ 1.426833] hw perfevents: enabled with armv6_1176 PMU driver, 3 counters available [ 1.431826] Initialise system trusted keyrings [ 1.432541] workingset: timestamp_bits=30 max_order=17 bucket_order=0 [ 1.447830] FS-Cache: Netfs 'nfs' registered for caching [ 1.449419] NFS: Registering the id_resolver key type [ 1.449533] Key type id_resolver registered [ 1.449571] Key type id_legacy registered [ 1.449628] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 1.451811] Key type asymmetric registered [ 1.451879] Asymmetric key parser 'x509' registered [ 1.451999] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250) [ 1.452050] io scheduler mq-deadline registered [ 1.452085] io scheduler kyber registered [ 1.455461] bcm2708_fb soc:fb: FB found 1 display(s) [ 1.456873] cma: cma_alloc: alloc failed, req-size: 1753 pages, ret: -12 [ 1.503109] Console: switching to colour frame buffer device 228x61 [ 1.537088] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 1824x984 [ 1.542932] bcm2835-rng 20104000.rng: hwrng registered [ 1.544036] vc-mem: phys_addr:0x00000000 mem_base=0x1ec00000 mem_size:0x20000000(512 MiB) [ 1.545955] vc-sm: Videocore shared memory driver [ 1.547167] gpiomem-bcm2835 20200000.gpiomem: Initialised: Registers at 0x20200000 [ 1.571401] brd: module loaded [ 1.588518] loop: module loaded [ 1.590278] Loading iSCSI transport class v2.0-870. [ 1.591726] usbcore: registered new interface driver smsc95xx [ 1.592022] dwc_otg: version 3.00a 10-AUG-2012 (platform bus) [ 1.620534] dwc_otg 20980000.usb: base=(ptrval) [ 1.821583] Core Release: 2.80a [ 1.821770] Setting default values for core params [ 1.821998] Finished setting default values for core params [ 2.022987] Using Buffer DMA mode [ 2.023180] Periodic Transfer Interrupt Enhancement - disabled [ 2.023416] Multiprocessor Interrupt Enhancement - disabled [ 2.023638] OTG VER PARAM: 0, OTG VER FLAG: 0 [ 2.024035] Dedicated Tx FIFOs mode [ 2.025168] WARN::dwc_otg_hcd_init:1045: FIQ DMA bounce buffers: virt = db514000 dma = 0x5b514000 len=9024 [ 2.025580] FIQ FSM acceleration enabled for : Non-periodic Split Transactions Periodic Split Transactions High-Speed Isochronous Endpoints Interrupt/Control Split Transaction hack enabled [ 2.026345] dwc_otg: Microframe scheduler enabled [ 2.026579] WARN::hcd_init_fiq:457: FIQ on core 0 [ 2.035719] WARN::hcd_init_fiq:458: FIQ ASM at c04efe50 length 36 [ 2.044943] WARN::hcd_init_fiq:497: MPHI regs_base at dc810000 [ 2.053917] dwc_otg 20980000.usb: DWC OTG Controller [ 2.063156] dwc_otg 20980000.usb: new USB bus registered, assigned bus number 1 [ 2.072227] dwc_otg 20980000.usb: irq 56, io mem 0x00000000 [ 2.081442] Init: Port Power? op_state=1 [ 2.090332] Init: Power Port (0) [ 2.099799] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.02 [ 2.109228] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 2.118357] usb usb1: Product: DWC OTG Controller [ 2.127783] usb usb1: Manufacturer: Linux 5.2.6+ dwc_otg_hcd [ 2.136888] usb usb1: SerialNumber: 20980000.usb [ 2.147763] hub 1-0:1.0: USB hub found [ 2.157006] hub 1-0:1.0: 1 port detected [ 2.167519] dwc_otg: FIQ enabled [ 2.167540] dwc_otg: NAK holdoff enabled [ 2.167551] dwc_otg: FIQ split-transaction FSM enabled [ 2.167580] Module dwc_common_port init [ 2.168275] usbcore: registered new interface driver usb-storage [ 2.178380] mousedev: PS/2 mouse device common for all mice [ 2.189438] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer [ 2.199241] bcm2835-cpufreq: min=700000 max=700000 [ 2.209688] sdhci: Secure Digital Host Controller Interface driver [ 2.218846] sdhci: Copyright(c) Pierre Ossman [ 2.228084] random: fast init done [ 2.238149] sdhost-bcm2835 20202000.mmc: could not get clk, deferring probe [ 2.248035] sdhci-pltfm: SDHCI platform and OF driver helper [ 2.258243] ledtrig-cpu: registered to indicate activity on CPUs [ 2.267520] hidraw: raw HID events driver (C) Jiri Kosina [ 2.277553] usbcore: registered new interface driver usbhid [ 2.286699] usbhid: USB HID core driver [ 2.297639] vchiq: vchiq_init_state: slot_zero = (ptrval)

[ 2.323117] [vc_sm_connected_init]: end - returning 0 [ 2.334338] Initializing XFRM netlink socket [ 2.343600] NET: Registered protocol family 17 [ 2.352500] Key type dns_resolver registered [ 2.363629] registered taskstats version 1 [ 2.372266] Loading compiled-in X.509 certificates [ 2.395329] uart-pl011 20201000.serial: cts_event_workaround enabled [ 2.404277] 20201000.serial: ttyAMA0 at MMIO 0x20201000 (irq = 81, base_baud = 0) is a PL011 rev2 [ 4.690547] printk: console [ttyAMA0] enabled [ 4.706452] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver [ 4.725838] sdhost: log_buf @ (ptrval) (5b513000) [ 4.739753] Indeed it is in host mode hprt0 = 00021501 [ 4.864061] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1) [ 4.883305] of_cfs_init [ 4.916311] of_cfs_init: OK [ 4.932655] Waiting for root device PARTUUID=93d699ac-02... [ 4.963796] usb 1-1: new high-speed USB device number 2 using dwc_otg [ 4.981606] Indeed it is in host mode hprt0 = 00001101 [ 5.062051] mmc0: host does not support reading read-only switch, assuming write-enable [ 5.082095] mmc0: new high speed SDHC card at address b368 [ 5.099225] mmcblk0: mmc0:b368 NCard 7.48 GiB [ 5.115995] mmcblk0: p1 p2 [ 5.174238] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null) [ 5.191867] VFS: Mounted root (ext4 filesystem) readonly on device 179:2. [ 5.221513] devtmpfs: mounted [ 5.234844] usb 1-1: New USB device found, idVendor=0424, idProduct=9514, bcdDevice= 2.00 [ 5.252783] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 5.276392] Freeing unused kernel memory: 468K [ 5.290363] This architecture does not have kernel memory protection. [ 5.306264] Run /sbin/init as init process [ 5.321713] hub 1-1:1.0: USB hub found [ 5.335500] hub 1-1:1.0: 5 ports detected [ 5.673844] usb 1-1.1: new high-speed USB device number 3 using dwc_otg [ 5.814425] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00, bcdDevice= 2.00 [ 5.832585] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 5.855377] smsc95xx v1.0.6 [ 5.962274] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-20980000.usb-1.1, smsc95xx USB 2.0 Ethernet, m.m.m.m [ 6.302675] systemd[1]: System time before build time, advancing clock. [ 6.502989] NET: Registered protocol family 10 [ 6.520732] Segment Routing with IPv6 [ 6.602389] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid) [ 6.646929] systemd[1]: Detected architecture arm. [ 6.721951] systemd[1]: Set hostname to <rasppi@raspberrypi1:~ $ berrypi1>. [ 6.754953] systemd[1]: Failed to bump fs.file-max, ignoring: Invalid argument [ 8.525914] uart-pl011 20201000.serial: no DMA platform data [ 8.933795] systemd[1]: File /lib/systemd/system/systemd-journald.service:12 configures an IP firewall (IPAddressDeny=any), but the local system does not support BPF/cgroup based firewalling. [ 8.962696] systemd[1]: Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.) [ 9.938330] random: systemd: uninitialized urandom read (16 bytes read) [ 10.004695] random: systemd: uninitialized urandom read (16 bytes read) [ 10.025111] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point. [ 10.060746] random: systemd: uninitialized urandom read (16 bytes read) [ 10.085762] systemd[1]: Created slice system-serial\x2dgetty.slice. [ 10.170297] systemd[1]: Condition check resulted in Journal Audit Socket being skipped. [ 10.202655] systemd[1]: Listening on Syslog Socket. [ 11.616131] systemd[1]: Starting udev Coldplug all Devices... [ 11.747586] systemd[1]: Reached target Swap. [ 11.859745] systemd[1]: Created slice system-systemd\x2dfsck.slice. [ 12.048048] systemd[1]: Started Journal Service. [ 15.147862] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null) [ 15.882966] systemd-journald[75]: Received request to flush runtime journal from PID 1 [ 18.400606] media: Linux media interface: v0.10 [ 18.674385] videodev: Linux video capture interface: v2.00 [ 18.709413] stmpe-spi spi0.1: stmpe610 detected, chip id: 0x811 [ 18.745075] stmpe-gpio stmpe-gpio: DMA mask not set [ 18.908753] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned. [ 19.000759] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned. [ 19.056368] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned. [ 27.236682] fbtft: module is from the staging directory, the quality is unknown, you have been warned. [ 27.406241] fb_ili9340: module is from the staging directory, the quality is unknown, you have been warned. [ 27.436429] fbtft_of_value: buswidth = 8 [ 27.436463] fbtft_of_value: debug = 0 [ 27.436485] fbtft_of_value: rotate = 90 [ 27.436503] fbtft_of_value: fps = 30 [ 27.436951] fb_ili9340 spi0.0: Failed to request dc-gpios GPIO:-2 [ 27.437155] fb_ili9340: probe of spi0.0 failed with error -2 [ 28.217859] stmpe-ts stmpe-ts: DMA mask not set [ 28.282698] input: stmpe-ts as /devices/platform/soc/20204000.spi/spi_master/spi0/spi0.1/stmpe-ts/input/input0 [ 31.164353] random: crng init done [ 31.164387] random: 7 urandom warning(s) missed due to ratelimiting [ 32.153048] 8021q: 802.1Q VLAN Support v1.8 [ 33.375783] cfg80211: Loading compiled-in X.509 certificates for regulatory database [ 34.329002] Adding 102396k swap on /var/swap. Priority:-2 extents:1 across:102396k SSFS [ 34.367140] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' [ 34.838188] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup [ 36.331010] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC5E1

Patch

The attached patch fixes the problem. It is tested on kernel 5.2.6. 0001-Fix-fbtft-for-kernels-5.2.0-and-above.patch.txt

[pelwell]

Thanks - that looks good, apart from one or two cosmetic issues that I can fix. Do you have a Signed-off-by line I may add?

[alexandref75]

Signed-off-by: Alexandre Peixoto Ferreira alexandref75@gmail.com Thanks,

[pelwell]

Reading through the patch again, I think it should be split in two: a one-line fix that removes the spurious ! in if (!par->gpio.dc), and a cleanup patch. Have you tried with just the one-line fix?

[lategoodbye]

Looks like a squash of some upstream commits: Staging: fbtft: Fix probing of gpio descriptor Staging: fbtft: Fix reset assertion when using gpio descriptor (not included by seems to be relevant) Staging: fbtft: Fix GPIO handling

So they might be backported soon.

[pelwell]

I'll hold off on a push/merge.

[alexandref75]

Wow. i should improve my searching, it would have saved a lot of debugging. the commits are much better than mine so this issue can be closed. the commits are from jun/11. it is already on 5.3.0-rc4 but i could not find references of backporting.

[lategoodbye]

The patches has been applied at the end of July, so it will take some time until they backported.

[pelwell]

The back-ports have now appeared in 5.2:

• 3558601
• 1dd12a5
• 46af9cb

Please retest, and close if appropriate.

[JamesH65]

@alexandref75 Can this be closed?

[alexandref75]

Yes, it can be closed. Sorry for the delay.