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notro / fbtft

Linux Framebuffer drivers for small TFT LCD display modules. Development has moved to https://git.kernel.org/cgit/linux/kernel/git/gregkh/staging.git/tree/drivers/staging/fbtft?h=staging-testing
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Problem using itdb24 driver. #439

Closed recner closed 7 years ago

recner commented 7 years ago

Hi Notro I have trouble setting up fbtft. My display is using S6D1121 driver. I am trying to load it using "sudo modprobe fbtft_device name=itdb24 gpios=db0:7,db1:5,db2:3,db3:1,db4:6,db5:4,db6:2,db7:0,cs:14,dc:12,wr:10,reset:11,rd:8,led:9" Backlight is not lighting up. Screen also doesn't turn on.

I think my problem is here [ 55.093561] fb_s6d1121 fb_s6d1121.0: fbtft_request_gpios: gpio_request_one('db7'=0) failed with -22 but i'm unable to find any solution.

I can manually set GPIO pins by:

echo 9 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio9/direction
echo 1 > /sys/class/gpio/gpio9/value

Thank you in advance.

device: Cubieboard A10 with armbian installed

uname -a: Linux cubieboard 3.4.113-sun4i #1 PREEMPT Thu Feb 2 21:26:29 CET 2017 armv7l armv7l armv7l GNU/Linux

dmesg:

[   55.053329] fbtft_device:  SPI devices registered:
[   55.067966] fbtft_device:  'fb' Platform devices registered:
[   55.073161] fbtft_device:  GPIOS used by 'itdb24':
[   55.080736] fbtft_device:    'db0' = GPIO7
[   55.084244] fbtft_device:    'db1' = GPIO5
[   55.093561] fb_s6d1121 fb_s6d1121.0: fbtft_request_gpios: gpio_request_one('db7'=0) failed with -22
[   55.108444] fbtft_device:    'db2' = GPIO3
[   55.117506] fbtft_device:    'db3' = GPIO1
[   55.120562] fbtft_device:    'db4' = GPIO6
[   55.124200] fbtft_device:    'db5' = GPIO4
[   55.127254] fbtft_device:    'db6' = GPIO2
[   55.130303] fbtft_device:    'db7' = GPIO0
[   55.134217] ------------[ cut here ]------------
[   55.140931] WARNING: at drivers/gpio/gpiolib.c:104 gpio_ensure_requested+0x58/0xb4()
[   55.142769] autorequest GPIO-14
[   55.144603] Modules linked in: fb_s6d1121(+) fbtft_device(+) fbtft syscopyarea sysfillrect sysimgblt fb_sys_fops bnep disp_ump mali_drm drm cpufreq_userspace mali ump sunxi_ir hidp rfcomm hci_uart bluetooth
[   55.168446] [<c00143b8>] (unwind_backtrace+0x0/0x12c) from [<c0032708>] (warn_slowpath_common+0x54/0x64)
[   55.176707] [<c0032708>] (warn_slowpath_common+0x54/0x64) from [<c0032748>] (warn_slowpath_fmt+0x30/0x40)
[   55.185055] [<c0032748>] (warn_slowpath_fmt+0x30/0x40) from [<c040bbf8>] (gpio_ensure_requested+0x58/0xb4)
[   55.193751] [<c040bbf8>] (gpio_ensure_requested+0x58/0xb4) from [<c040bd18>] (gpio_direction_input+0xc4/0x1c4)
[   55.202733] [<c040bd18>] (gpio_direction_input+0xc4/0x1c4) from [<bf13c260>] (fbtft_free_gpios+0x70/0xe4 [fbtft])
[   55.213013] [<bf13c260>] (fbtft_free_gpios+0x70/0xe4 [fbtft]) from [<bf13cf50>] (fbtft_register_framebuffer+0x174/0x2d0 [fbtft])
[   55.223630] [<bf13cf50>] (fbtft_register_framebuffer+0x174/0x2d0 [fbtft]) from [<bf13e29c>] (fbtft_probe_common+0x12c/0x2cc [fbtft])
[   55.232861] [<bf13e29c>] (fbtft_probe_common+0x12c/0x2cc [fbtft]) from [<c047776c>] (driver_probe_device+0xb8/0x378)
[   55.240951] [<c047776c>] (driver_probe_device+0xb8/0x378) from [<c0477afc>] (__driver_attach+0x8c/0x90)
[   55.248692] [<c0477afc>] (__driver_attach+0x8c/0x90) from [<c04759e4>] (bus_for_each_dev+0x68/0x9c)
[   55.256433] [<c04759e4>] (bus_for_each_dev+0x68/0x9c) from [<c0476cf0>] (bus_add_driver+0xd0/0x28c)
[   55.264173] [<c0476cf0>] (bus_add_driver+0xd0/0x28c) from [<c047811c>] (driver_register+0x78/0x134)
[   55.272085] [<c047811c>] (driver_register+0x78/0x134) from [<c0008640>] (do_one_initcall+0x104/0x15c)
[   55.280176] [<c0008640>] (do_one_initcall+0x104/0x15c) from [<c00739ec>] (sys_init_module+0x8d8/0x1d64)
[   55.288093] [<c00739ec>] (sys_init_module+0x8d8/0x1d64) from [<c000eca0>] (ret_fast_syscall+0x0/0x30)
[   55.291667] ---[ end trace e54264fa7926eac7 ]---
[   55.306226] fbtft_device:    'cs' = GPIO14
[   55.309290] fbtft_device:    'dc' = GPIO12
[   55.312340] fbtft_device:    'wr' = GPIO10
[   55.318738] fbtft_device:    'reset' = GPIO11
[   55.321704] fbtft_device:    'rd' = GPIO8
[   55.325013] fbtft_device:    'led' = GPIO9
[   55.329624] fbtft_device:  'fb' Platform devices registered:
[   55.334028] fbtft_device:      fb_s6d1121 id=0 pdata? yes
[   55.344771] ------------[ cut here ]------------
[   55.351490] WARNING: at drivers/gpio/gpiolib.c:104 gpio_ensure_requested+0x58/0xb4()
[   55.353328] autorequest GPIO-12
[   55.355163] Modules linked in: fb_s6d1121(+) fbtft_device fbtft syscopyarea sysfillrect sysimgblt fb_sys_fops bnep disp_ump mali_drm drm cpufreq_userspace mali ump sunxi_ir hidp rfcomm hci_uart bluetooth
[   55.378735] [<c00143b8>] (unwind_backtrace+0x0/0x12c) from [<c0032708>] (warn_slowpath_common+0x54/0x64)
[   55.386997] [<c0032708>] (warn_slowpath_common+0x54/0x64) from [<c0032748>] (warn_slowpath_fmt+0x30/0x40)
[   55.395345] [<c0032748>] (warn_slowpath_fmt+0x30/0x40) from [<c040bbf8>] (gpio_ensure_requested+0x58/0xb4)
[   55.404041] [<c040bbf8>] (gpio_ensure_requested+0x58/0xb4) from [<c040bd18>] (gpio_direction_input+0xc4/0x1c4)
[   55.413022] [<c040bd18>] (gpio_direction_input+0xc4/0x1c4) from [<bf13c260>] (fbtft_free_gpios+0x70/0xe4 [fbtft])
[   55.423294] [<bf13c260>] (fbtft_free_gpios+0x70/0xe4 [fbtft]) from [<bf13cf50>] (fbtft_register_framebuffer+0x174/0x2d0 [fbtft])
[   55.433912] [<bf13cf50>] (fbtft_register_framebuffer+0x174/0x2d0 [fbtft]) from [<bf13e29c>] (fbtft_probe_common+0x12c/0x2cc [fbtft])
[   55.443143] [<bf13e29c>] (fbtft_probe_common+0x12c/0x2cc [fbtft]) from [<c047776c>] (driver_probe_device+0xb8/0x378)
[   55.451233] [<c047776c>] (driver_probe_device+0xb8/0x378) from [<c0477afc>] (__driver_attach+0x8c/0x90)
[   55.458975] [<c0477afc>] (__driver_attach+0x8c/0x90) from [<c04759e4>] (bus_for_each_dev+0x68/0x9c)
[   55.466716] [<c04759e4>] (bus_for_each_dev+0x68/0x9c) from [<c0476cf0>] (bus_add_driver+0xd0/0x28c)
[   55.474455] [<c0476cf0>] (bus_add_driver+0xd0/0x28c) from [<c047811c>] (driver_register+0x78/0x134)
[   55.482367] [<c047811c>] (driver_register+0x78/0x134) from [<c0008640>] (do_one_initcall+0x104/0x15c)
[   55.490458] [<c0008640>] (do_one_initcall+0x104/0x15c) from [<c00739ec>] (sys_init_module+0x8d8/0x1d64)
[   55.498376] [<c00739ec>] (sys_init_module+0x8d8/0x1d64) from [<c000eca0>] (ret_fast_syscall+0x0/0x30)
[   55.501949] ---[ end trace e54264fa7926eac8 ]---
[   55.507349] ------------[ cut here ]------------
[   55.514060] WARNING: at drivers/gpio/gpiolib.c:104 gpio_ensure_requested+0x58/0xb4()
[   55.515897] autorequest GPIO-10
notro commented 7 years ago

I can manually set GPIO pins by

It's gpio 0 (zero) that fails, have you tried that through sysfs?

recner commented 7 years ago

Oh, I haven't noticed that gpios start at 1. Now I'm using this command sudo modprobe fbtft_device name=itdb24 gpios=db0:8,db1:6,db2:4,db3:2,db4:7,db5:5,db6:3,db7:1,cs:15,dc:13,wr:11,reset:12 LED backlight is wired directly to GND, so backlight is always on. RD is wired to 3.3v. All pins are wired correctly, tested with python script from troubleshooting Screen however stays white. Is it correct driver for this screen?

screen: http://www.ebay.com/itm/282274565558 dmesg:

[   34.721559] dma0: IRQ with no loaded buffer?
[   45.935222] fbtft_device:  SPI devices registered:
[   45.939842] fbtft_device:  'fb' Platform devices registered:
[   45.943808] fbtft_device:  GPIOS used by 'itdb24':
[   45.962076] fbtft_device:    'db0' = GPIO8
[   45.983445] fbtft_device:    'db1' = GPIO6
[   45.986501] fbtft_device:    'db2' = GPIO4
[   45.989550] fbtft_device:    'db3' = GPIO2
[   46.003354] fbtft_device:    'db4' = GPIO7
[   46.006612] fbtft_device:    'db5' = GPIO5
[   46.009673] fbtft_device:    'db6' = GPIO3
[   46.012723] fbtft_device:    'db7' = GPIO1
[   46.023345] fbtft_device:    'cs' = GPIO15
[   46.026403] fbtft_device:    'dc' = GPIO13
[   46.029452] fbtft_device:    'wr' = GPIO11
[   46.032762] fbtft_device:    'reset' = GPIO12
[   46.054890] fbtft_device:  'fb' Platform devices registered:
[   46.059302] fbtft_device:      fb_s6d1121 id=0 pdata? yes
[   46.343368] graphics fb2: fb_s6d1121 frame buffer, 240x320, 150 KiB video memory, 4 KiB buffer memory, fps=20
notro commented 7 years ago

Is it correct driver for this screen?

Looks that way, but the default init sequence in the driver isn't the same as one Arduino init I found, some register settings was missing.

I couldn't find any reference on how to setup the controller on the ebay page. The init sequence is panel specific.

fbtft init: https://github.com/notro/fbtft/blob/master/fb_s6d1121.c#L41 Arduino init: https://github.com/iot-playground/Arduino/blob/master/external_libraries/UTFT/tft_drivers/s6d1121/initlcd.h

init= parameter: https://github.com/notro/fbtft/wiki/fbtft_device#parameters

recner commented 7 years ago

I tried to pass init sequence from arduino library via init parameter and nothing happened (white screen). I connected screen to an arduino and uploaded UTFT library example. It also doesn't work (white screen). I assume that I have broken lcd.
I'm closing this, because it's definitely not an issue of fbtft. Thank you for helping :)