LCD
Kernel Device Tree
Top-Level Device Tree Directory
Android SDK Path:
longan/device/config/chips/a133/configs/c3/kickpi-k5c.dts
#include "lcd-lvds-7-1024-600.dtsi"
//#include "lcd-lvds-21-1920-1080.dtsi"
//#include "lcd-mipi-10-800-1280-v1.dtsi"
//#include "lcd-mipi-10-800-1280-v2.dtsi"
//#include "lcd-mipi-8-800-1280.dtsi"
//#include "lcd-mipi-5-720-1280.dtsi"Linux SDK Path:
device/config/chips/a133/configs/c3/kickpi-k5c.dtsSecondary Device Tree Directory
Android/Linux SDK Path:
longan/kernel/linux-4.9/arch/arm64/boot/dts/sunxi/lcd-lvds-21-1920-1080.dtsi
21-27" LVDS (1920x1080)
lcd-lvds-7-1024-600.dtsi
7" LVDS (1024x600)
lcd-mipi-10-800-1280-v1.dtsi
10.1" MIPI (800x1280, v1)
lcd-mipi-10-800-1280-v2.dtsi
10.1" MIPI (800x1280, v2)
lcd-mipi-5-720-1280.dtsi
5" MIPI (720x1280)
lcd-mipi-8-800-1280.dtsi
8" MIPI (800x1280)
Screen Selection and Compilation
MIPI Screens
Model
Size
Resolution
Device Tree File
AT101DS40I
10.1-inch
800x1280
lcd-mipi-10-800-1280-v1.dtsi
MX101BA1340
10.1-inch
800x1280
lcd-mipi-10-800-1280-v2.dtsi
MX080B2140
8.0-inch
800x1280
lcd-mipi-8-800-1280.dtsi
F050008M01
5.0-inch
720x1280
lcd-mipi-5-720-1280.dtsi
LVDS Screens
Model
Size
Resolution
Device Tree File
MX070IBC
7.0-inch
1024x600
lcd-lvds-7-1024-600.dtsi
-
21-27 inch
1920x1080
lcd-lvds-21-1920-1080.dtsi
Example: Selecting the 7" LVDS screen:
$ vim longan/device/config/chips/a133/configs/c3/kickpi-k5c.dts
#include "lcd-lvds-7-1024-600.dtsi" // Enable 7" LVDS
//#include "lcd-lvds-21-1920-1080.dtsi" // Disable others
//#include "lcd-mipi-10-800-1280.dtsi"Note: Only one
lcd-*.dtsifile can be enabled at a time.
LCD Driver
UBOOT Driver Path:
longan/brandy/brandy-2.0/u-boot-2018/drivers/video/sunxi/disp2/disp/lcd/
mipi_800x1280.c // MIPI LCD driverKernel Driver Path:
longan/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/lcd/
mipi_800x1280.c // MIPI LCD driverSingle LVDS Interface
Hardware Label:
LVDS_LCD(30-pin clamp connector).Default Configuration: Supports 7" LVDS screen (1024x600).
Dual LVDS Interface
Hardware Label:
DUAL_LVDS(30-pin vertical connector).Voltage Options: 3.3V, 5V, 12V. Select voltage based on screen specifications to avoid damage!
K5 Board:
K5C Board:
Warnings:
Ensure the power adapter provides sufficient current for the screen. Insufficient current may cause backlight flickering.
If flickering occurs, disconnect power immediately and replace the adapter.
Debugging Information
View Current Display Properties:
cat /sys/class/disp/disp/attr/sys Example Output:
# cat /sys/class/disp/disp/attr/sys
screen 0:
de_rate 300000000 hz, ref_fps:66
mgr0: 720x1280 fmt[rgb] cs[0x204] range[full] eotf[0x4] bits[8bits] err[1] force_sync[0] unblank direct_show[false] iommu[1]
dmabuf: cache[7] cache max[37] umap skip[0] overflow[4]
lcd output backlight(102) fps:66.5 720x1280
err:2 skip:99 irq:17699 vsync:12094 vsync_skip:0
BUF enable ch[3] lyr[0] z[0] prem[Y] a[globl 255] fmt[ 1] fb[ 736,1280; 368, 640; 368, 640] crop[ 0, 0, 720,1280] frame[ 0, 0, 720,1280] addr[fec00000,fecf0000,fed29800] flags[0x 0] trd[0,0]
depth[ 0] disp[0]all:685, sub:685, cur:685, free:682, skip:0Last updated