Question
How to drive the screen like ili9341 with tinyDRM? anyone succeed?
Hello, guys.
My goal is highly consistent with this ticket:
I hope to drive the LCD ili9341 based on STM32MP157F-DK2 but till now it has not been successful, the LCD has always been a white screen.
kernel config
CONFIG_TINYDRM_ILI9341=y
/* drivers/gpu/drm/tiny/ili9341.c */device tree
&spi5 {
status = "okay";
panel: display@0{
compatible = "adafruit,yx240qv29", "ilitek,ili9341";
reg = <0>;
spi-3wire;
spi-max-frequency = <10000000>;
dc-gpios = <&gpioa 8 GPIO_ACTIVE_HIGH>;
reset-gpios = <&gpiod 7 GPIO_ACTIVE_HIGH>;
rotation = <270>;
status = "okay";
};
};
some logs
the card 0 is the default mipi otm8009a display that works well.
root@stm32mp1:~# ls /dev/dri/
by-path card0 card1
root@stm32mp1:~# dmesg | grep ili9341
[ 14.917187] [drm] Initialized ili9341 1.0.0 20180514 for spi0.0 on minor 1
root@stm32mp1:/sys/kernel/debug/dri/1# ls
SPI-1 clients command crtc-0 framebuffer gem_names internal_clients name state
root@stm32mp1:/sys/kernel/debug/dri/1# cat name
ili9341 dev=spi0.0 unique=spi0.0
root@stm32mp1:/sys/kernel/debug/dri/1# cat state
plane[32]: plane-0
crtc=(null)
fb=0
crtc-pos=0x0+0+0
src-pos=0.000000x0.000000+0.000000+0.000000
rotation=1
normalized-zpos=0
color-encoding=ITU-R BT.601 YCbCr
color-range=YCbCr limited range
crtc[34]: crtc-0
enable=0
active=0
self_refresh_active=0
planes_changed=0
mode_changed=0
active_changed=0
connectors_changed=0
color_mgmt_changed=0
plane_mask=0
connector_mask=0
encoder_mask=0
mode: "": 0 0 0 0 0 0 0 0 0 0 0x0 0x0
connector[31]: SPI-1
crtc=(null)
self_refresh_aware=0
max_requested_bpc=0
root@stm32mp1:/sys/kernel/debug/dri/1# cat framebuffer
root@stm32mp1:/sys/kernel/debug/dri/1# waveform
I observed four signals:SCLK/MOSI/DC/RESET.(the CS is by default connected to gnd.
but there is no action on SPI.
I suspect there is still something wrong with the configuration of the device tree, but I don't know how to configure it.
Did you make any progress later? can you share with me?Thanks a lot.