Raspberry Pi用 KeDei 3.5インチ TFT液晶を FBTFT tinydrmで駆動する方法

Original text from
 KeDei 3.5 inch 480x320 TFT lcd from ali
 https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=124961&start=175
 by notro - Fri Mar 24, 2017 3:52 am - Step-by-step and some more:

 notro/tinydrm - Out-of-tree tinydrm modules
 https://github.com/notro/tinydrm/


KeDei 3.5inch LCD V5.0 module for tinydrm Raspberry Pi
Modified by FREE WING, Y.Sakamoto
http://www.neko.ne.jp/~freewing/

FREEWING-JP/tinydrm - forked from notro/tinydrm
https://github.com/FREEWING-JP/tinydrm/tree/feature/kedei_35_v50
--------------------------------


# ========
# ========
# Check Raspbian version
uname -a
# Linux raspberrypi 4.4.50-v7+ #970 SMP Mon Feb 20 19:18:29 GMT 2017 armv7l GNU/Linux

# ====
# install tinydrm kernel with headers
sudo REPO_URI=https://github.com/notro/rpi-firmware BRANCH=tinydrm rpi-update

# *** If no errors appeared, your firmware was successfully updated to fc4ad383a059a38cae39815dcef0210663d7147f
# *** A reboot is needed to activate the new firmware

sudo reboot


# ========
# ========
# Check Raspbian version
uname -a
# Linux raspberrypi 4.10.4-v7+ #1 SMP Wed Mar 22 13:05:23 CET 2017 armv7l GNU/Linux


# ====
# if you want me to pull your changes, fork this repo and use your fork instead
cd
## git clone https://github.com/notro/tinydrm
git clone -b feature/kedei_35_v50 https://github.com/FREEWING-JP/tinydrm.git
cd ~/tinydrm/
make

sudo make install && sudo depmod

# ====
sudo dtc -@ -I dts -O dtb -o /boot/overlays/keidei20.dtbo rpi-overlays/keidei20-overlay.dts

# Warning (unit_address_vs_reg):

# ====
sudo nano /boot/cmdline.txt
# drm.debug=0xf

# ====
sudo nano /boot/config.txt
# dtoverlay=keidei20

# ====
sudo reboot


# ========
# ========
ls -al /dev/fb*

sudo apt-get update
sudo apt-get install -y fbi
wget https://github.com/adafruit/Adafruit_Python_ILI9341/raw/master/examples/cat.jpg
sudo fbi -d /dev/fb1 -T 1 -a cat.jpg

# ====
sudo vcdbg log msg 2>&1 | grep keidei
# 002167.799: Loaded overlay 'keidei20'

# ====
cat /proc/device-tree/soc/spi@7e204000/keidei@0/compatible && echo
# keidei,keidei_v20

# ====
cat /sys/bus/spi/devices/spi0.0/modalias
# spi:keidei_v20

# ====
modinfo keidei

# ====
# picked only the relevant modules
lsmod | grep keidei

# ====
# only relevant parts
dmesg | grep keidei

# ====
# clear log
sudo dmesg -C

# ====
# one second of console output will flood the log with the detailed logging in keidei20_write()
# so remove it when it looks ok
con2fbmap 1 1 && sleep 1 && con2fbmap 1 0
dmesg | wc -l
# 2046


# ====
sudo nano /boot/cmdline.txt
# fbcon=map:1

# ====
sudo reboot


# ========
# ========
# no need to reboot or reinstall modules to test a driver change
#  if the depending modules are loaded
# but 'make install' is necessary to load the correct version on boot
cd ~/tinydrm/
make
sudo rmmod keidei
sudo insmod keidei.ko

sudo apt-get -y install autoconf libtool xutils-dev libpthread-stubs0-dev

git clone https://github.com/freedreno/libdrm
cd libdrm
./autogen.sh
make

$ ./tests/modetest/modetest -M "keidei_v20" -c
failed to open device 'keidei_v20': No such file or directory

$ ./tests/modetest/modetest -M "keidei" -c
Connectors:
id      encoder status          name            size (mm)       modes   encoders
25      28      connected       Virtual-1       0x0             1       28
  modes:
        name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
  480x320 0 480 480 480 480 320 320 320 320 1 flags: ; type: preferred, driver
  props:
        2 DPMS:
                flags: enum
                enums: On=0 Standby=1 Suspend=2 Off=3
                value: 0

$ ./tests/modetest/modetest -M "keidei" -s 25:480x320@RG16 -v
setting mode 480x320-0Hz@RG16 on connectors 25, crtc 27
freq: 0.50Hz

[   87.891552] keidei spi0.1: fb1:  frame buffer device
[   87.934529] [drm:keidei_probe [keidei]] Initialized keidei:spi0.1 @32MHz on minor 0

$ ./tests/modetest/modetest -M "keidei" -s 25:480x320@RG16
[  282.506163] [drm:keidei_enable [keidei]]
[  282.508313] [drm:keidei20_command [keidei]] cmd=2a, par=00 00 01 df
[  282.508328] [drm:keidei20_write8 [keidei]] 2a /  15:11 / 15:1b
[  282.508410] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  282.508518] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  282.508559] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  282.508601] [drm:keidei20_write8 [keidei]] df /  6f:35 / 6f:3f
[  282.508640] [drm:keidei20_command [keidei]] cmd=2b, par=00 00 01 3f

[    5.062074] keidei spi0.1: fb1:  frame buffer device
[    5.123948] [drm:keidei_probe [keidei]] Initialized keidei:spi0.1 @16MHz on minor 0

$ ./tests/modetest/modetest -M "keidei" -s 25:480x320@RG16 -v
setting mode 480x320-0Hz@RG16 on connectors 25, crtc 27
freq: 0.45Hz
freq: 0.45Hz

# ==== SPI SCLK Freq. 16MHz
sudo nano /boot/config.txt
# dtoverlay=keidei20:speed=16000000

# speed =    <&keidei>, "spi-max-frequency:0";
# rotation = <&keidei>, "rotation:0";

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