介绍spacemit平台Display模块的功能和使用方法。
模块介绍
spacemit平台Display模块使用DRM框架，DRM全称是Direct Rendering Manager，是Linux系统目前主流的显示框架，适应当前显示硬件的特性。
功能介绍
用户空间（Libdrm）：
DRM框架在用户空间提供的Lib，用户或应用程序在用户空间调用libdrm提供的库函数， 即可访问到显示的资源，并对显示资源进行管理和使用。
内核空间(DRM driver )：
DRM driver提供了一系列的 IOCTL 接口，可以分成两类：Graphics Execution Manager (GEM)、Kernel Mode-Setting (KMS)。
GEM
GEM 主要是对 FrameBuffer 的管理，如显存的申请释放 (Framebuffer managing) ，显存共享机制 (Memory sharing objects)， 及显存同步机制 (Memory synchronization)；
KMS
KMS 主要负责管理显示模式的设置和图像输出 。KMS模型由组件Framebuffer，CRTC，Planes，Encoder，Connector组成。
Framebuffer:
一块内存区域，驱动和应用层可访问，单个图层的显示内容。
CRTC:
显示控制器，负责把要显示的图像，转化为底层硬件层面上的具体时序要求，还负责着帧切换、电源控制、色彩调整等等。
Plane:
图层，每个图像拥有一个Planes，Planes的属性控制着图像的显示区域、图像翻转、色彩混合方式等， CRTC的显示图像实际上是Framebuffer和Planes的组合，得到多个图像的混合显示或单独显示。 图层有以下三种类型：
- 主图层（primary plane），用于显示背景或者图像内容；
- 叠加图层（overlay plane），通常用于叠加，比如视频图层；
- 光标图层(cursor)，用于显示鼠标。
Encoder:
编码器，负责电源管理、视频输出格式封装，把时序转换为显示器所需要的信号，将画面显示到不同的显示设备，例如将视频输出到HDMI接口、MIPI DSI接口等。
Connector：
连接器，负责硬件显示设备的接入、屏参获取等，例如HDMI, MIPI DSI等。
Panel
显示面板，负责将接收的图像信号转换为显示图像。
源码结构介绍
spacemit平台DRM驱动源码结构：
linux-6.6/drivers/gpu/drm$ tree spacemit
spacemit
|-- dphy
| `-- spacemit_dphy_drv.c // mipi dsi dphy驱动
|-- dpu // dpu 驱动
| |-- dpu_debug.c
| |-- dpu_debug.h
| |-- dpu_saturn.c
| |-- dpu_saturn.h
| |-- dpu_trace.h
| |-- saturn_fbcmem.c
| |-- saturn_fbcmem.h
| `-- saturn_regs
| |-- cmdlist.h
| |-- cmps_x.h
| |-- dma_top.h
| |-- dpu_crg.h
| |-- dpu_ctl.h
| |-- dpu_intp.h
| |-- dpu_top.h
| |-- mmu.h
| |-- outctrl_proc_x.h
| |-- outctrl_top_x.h
| |-- prepipe_layer_proc_x.h
| |-- rdma_path_x.h
| |-- reg_map.h
| |-- scaler_x.h
| `-- wb_top.h
|-- dsi // mipi dsi 驱动
| |-- spacemit_dptc_drv.c
| |-- spacemit_dptc_drv.h
| |-- spacemit_dsi_drv.c
| `-- spacemit_dsi_hw.h
|-- Kconfig
|-- lt8911exb.c // lt8911exb mipi dsi转eDP panel驱动
|-- lt9711.c // lt9711 mipi dsi转DP panel驱动
|-- Makefile
|-- spacemit_bootloader.c
|-- spacemit_bootloader.h
|-- spacemit_cmdlist.c
|-- spacemit_cmdlist.h
|-- spacemit_dmmu.c
|-- spacemit_dmmu.h
|-- spacemit_dphy.c
|-- spacemit_dphy.h
|-- spacemit_dpu.c
|-- spacemit_dpu.h
|-- spacemit_dpu_reg.h
|-- spacemit_drm.c // DRM core 驱动
|-- spacemit_drm.h
|-- spacemit_dsi.c
|-- spacemit_dsi.h
|-- spacemit_gem.c // GEM 驱动
|-- spacemit_gem.h
|-- spacemit_hdmi.c // HDMI 驱动
|-- spacemit_hdmi.h
|-- spacemit_lib.c
|-- spacemit_lib.h
|-- spacemit_mipi_panel.c // panel 驱动
|-- spacemit_mipi_panel.h
|-- spacemit_planes.c
|-- spacemit_wb.c // write back 驱动
|-- spacemit_wb.h
`-- sysfs
|-- sysfs_class.c
|-- sysfs_display.h
|-- sysfs_dphy.c
|-- sysfs_dpu.c
|-- sysfs_dsi.c
`-- sysfs_mipi_panel.c
关键特性
特性
| 特性 | 特性说明 |
|---|---|
| 支持MIPI DSI | 支持MIPI DPHY v1.1, 支持DPHY 4 lane，最高速率1.2Gbps/lane |
| 支持HDMI | 支持HDMI 1.4a |
性能参数
| 屏幕接口 | 性能规格 |
|---|---|
| MIPI DSI | 1920x1200@60FPS |
| HDMI | 1920x1080@60FPS |
MIPI DSI屏幕帧率测试方法:
查看Connectors：
# modetest -M spacemit -D /dev/dri/card1 -c
Connectors:
id encoder status name size (mm) modes encoders
130 129 connected DSI-1 142x228 1 129
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 1200x1920 60.05 1200 1250 1260 1300 1920 1940 1944 1960 153000 flags: phsync, pvsync; type: preferred, driver
props:
1 EDID:
flags: immutable blob
blobs:
value:
2 DPMS:
flags: enum
enums: On=0 Standby=1 Suspend=2 Off=3
value: 0
5 link-status:
flags: enum
enums: Good=0 Bad=1
value: 0
6 non-desktop:
flags: immutable range
values: 0 1
value: 0
4 TILE:
flags: immutable blob
blobs:
value:
查看Encoders：
# modetest -M spacemit -D /dev/dri/card1 -e
Encoders:
id crtc type possible crtcs possible clones
129 127 DSI 0x00000001 0x00000001
测试MIPI DSI屏幕帧率：
# modetest -M spacemit -D /dev/dri/card1 -s 130@127:1200x1920 -v
setting mode 1200x1920-60.05Hz on connectors 130, crtc 127
freq: 60.55Hz
freq: 60.28Hz
freq: 60.28Hz
HDMI屏幕帧率测试方法:
查看Connectors：
# modetest -M spacemit -D /dev/dri/card2 -c
Connectors:
id encoder status name size (mm) modes encoders
130 129 connected HDMI-A-1 300x260 12 129
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 1920x1080 60.00 1920 2008 2052 2200 1080 1082 1087 1125 148500 flags: phsync, pvsync; type: preferred, driver
#1 1920x1080 60.00 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
#2 1920x1080 59.94 1920 2008 2052 2200 1080 1084 1089 1125 148352 flags: phsync, pvsync; type: driver
#3 1600x900 60.00 1600 1624 1704 1800 900 901 904 1000 108000 flags: phsync, pvsync; type: driver
#4 1280x1024 60.02 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver
#5 1152x864 59.97 1152 1216 1336 1520 864 865 868 895 81579 flags: nhsync, pvsync; type:
#6 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
#7 1280x720 59.94 1280 1390 1430 1650 720 725 730 750 74176 flags: phsync, pvsync; type: driver
#8 1024x768 60.00 1024 1048 1184 1344 768 771 777 806 65000 flags: nhsync, nvsync; type: driver
#9 800x600 60.32 800 840 968 1056 600 601 605 628 40000 flags: phsync, pvsync; type: driver
#10 640x480 60.00 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
#11 640x480 59.94 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
props:
1 EDID:
flags: immutable blob
blobs:
value:
00ffffffffffff005c73562501000000
321d0103801e1a783eee91a3544c9926
0f505421080071408180a9c0d1c00101
010101010101023a801871382d40582c
2500dd0c1100001e000000fc0048444d
490a2020202020202020000000ff000a
202020202020202020202020000000fd
003b3f1e5414000a20202020202001c5
02032ef1429004e200d5e305c0002309
7f078301000067030c0010001878e606
0501626200681a00000101304be6023a
801871382d40582c4500dd0c1100001e
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
000000000000000000000000000000f5
2 DPMS:
flags: enum
enums: On=0 Standby=1 Suspend=2 Off=3
value: 0
5 link-status:
flags: enum
enums: Good=0 Bad=1
value: 0
6 non-desktop:
flags: immutable range
values: 0 1
value: 0
4 TILE:
flags: immutable blob
blobs:
value:
查看Encoders：
# modetest -M spacemit -D /dev/dri/card2 -e
Encoders:
id crtc type possible crtcs possible clones
129 127 TMDS 0x00000001 0x00000001
测试HDMI屏幕帧率：
# modetest -M spacemit -D /dev/dri/card2 -s 130@127:1920x1080 -v
setting mode 1920x1080-60.00Hz on connectors 130, crtc 127
freq: 60.13Hz
freq: 60.00Hz
freq: 60.00Hz
配置介绍
主要包括Display驱动使能配置和dts配置，K1芯片支持1个MIPI DSI硬件接口和1个HDMI硬件接口。
CONFIG配置
CONFIG_DRM_SPACEMIT：spacemit平台DRM驱动配置选项，默认情况，此选项为Y，MIPI DSI驱动或HDMI驱动配置依赖此配置选项，可单独配置或同时配置MIPI DSI驱动和HDMI驱动。
Device Drivers --->
Graphics support --->
<*> DRM Support for Spacemit
< > MIPI Panel Support For Spacemit
< > HDMI Support For Spacemit
MIPI DSI CONFIG配置
CONFIG_SPACEMIT_MIPI_PANEL：spacemit平台MIPI DSI驱动配置选项，具体方案根据需要进行配置。
Device Drivers --->
Graphics support --->
<*> DRM Support for Spacemit
<*> MIPI Panel Support For Spacemit
HDMI CONFIG配置
CONFIG_SPACEMIT_HDMI：spacemit平台HDMI驱动配置选项，具体方案根据需要进行配置。
Device Drivers --->
Graphics support --->
<*> DRM Support for Spacemit
<*> HDMI Support For Spacemit
dts配置
MIPI DSI
gpio
MIPI DSI panel gpio相关配置，包括panel复位gpio配置和panel电源控制gpio配置。
以k1-x_deb1方案为例： gpio81配置为panel复位pin，gpio82和gpio83配置为panel电源控制pin。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x_deb1.dts
&dsi2 {
status = "okay";
panel2: panel2@0 {
status = "okay";
compatible = "spacemit,mipi-panel2";
reg = <0>;
gpios-reset = <81>; // 配置panel 复位 gpio
gpios-dc = <82 83>; // 配置panel 电源控制 gpio
};
};
电源配置
MIPI DSI电源配置，包括MIPI DSI 1.2v电源控制配置。
以k1-x_deb1方案为例： 配置pmic ldo_5为MIPI DSI 1.2v。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x_deb1.dts
&dpu_online2_dsi {
status = "okay";
dsi_1v2-supply = <&ldo_5>; // 引用PMIC DLDO
vin-supply-names = "dsi_1v2"; // 配置MIPI DSI 1.2v电源
};
clock配置
MIPI DSI相关clock配置，包括MIPI DSI DPU相关clock配置，reset配置，及MIPI DSI DPHY相关clock配置。其中pixel clock和 bit clock通过timing参数计算获取，具体计算方法请参见display timing配置章节。display-timings中的clock-frequency为pixel clock值，mipi dsi dpu中的spacemit-dpu-bitclk和mipi dsi dphy中的phy-bit-clock为bit clock值。mipi dsi dpu escclk及mipi dsi dphy escclk配置51200000或76800000（分辨率1920x1080以上推荐使用76800000），其它clock参数使用系统默认值，不需在dts文件中配置。
配置平台MIPI DSI DPU相关clock和reset。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x-lcd.dtsi
&soc {
display-subsystem-dsi {
compatible = "spacemit,saturn-le";
reg = <0 0xC0340000 0 0x2A000>;
ports = <&dpu_online2_dsi>;
interconnects = <&dram_range1>;
interconnect-names = "dma-mem";
};
dpu_online2_dsi: port@c0340000 {
compatible = "spacemit,dpu-online2";
interrupt-parent = <&intc>;
interrupts = <90>, <89>;
interrupt-names = "ONLINE_IRQ", "OFFLINE_IRQ";
clocks = <&ccu CLK_DPU_PXCLK>, // mipi dsi dpu pxclk 配置
<&ccu CLK_DPU_MCLK>, // mipi dsi dpu mclk 配置
<&ccu CLK_DPU_HCLK>, // mipi dsi dpu hclk 配置
<&ccu CLK_DPU_ESC>, // mipi dsi dpu escclk 配置
<&ccu CLK_DPU_BIT>; // mipi dsi dpu bitclk 配置
clock-names = "pxclk", "mclk", "hclk", "escclk", "bitclk";
resets = <&reset RESET_MIPI>, // mipi dsi dpu dsi reset 配置
<&reset RESET_LCD_MCLK>, // mipi dsi dpu mclk reset 配置
<&reset RESET_LCD>, // mipi dsi dpu lcd reset 配置
<&reset RESET_DSI_ESC>; // mipi dsi dpu esc reset 配置
reset-names= "dsi_reset", "mclk_reset", "lcd_reset","esc_reset";
power-domains = <&power K1X_PMU_LCD_PWR_DOMAIN>;
pipeline-id = <ONLINE2>;
ip = "spacemit-saturn";
spacemit-dpu-min-mclk = <40960000>;
type = <DSI>;
clk,pm-runtime,no-sleep;
status = "disabled";
dpu_online2_dsi_out: endpoint@0 {
remote-endpoint = <&dsi2_in>;
};
dpu_offline0_dsi_out: endpoint@1 {
remote-endpoint = <&wb0_in>;
};
};
}
配置方案MIPI DSI DPU bitclk 及 escclk。 以k1-x_deb1方案为例：
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x_deb1.dts
&dpu_online2_dsi {
status = "okay";
spacemit-dpu-bitclk = <1000000000>; // mipi dsi dpu bitclk 配置
spacemit-dpu-escclk = <76800000>; // mipi dsi dpu escclk 配置
};
配置Panel型号MIPI DSI DPHY bitclk 及 escclk。 以MIPI DSI panel型号lcd_gx09inx101_mipi为例：
// linux-6.6\arch\riscv\boot\dts\spacemit\lcd\lcd_gx09inx101_mipi.dtsi
/ { lcds: lcds {
lcd_gx09inx101_mipi: lcd_gx09inx101_mipi {
phy-bit-clock = <1000000000>; // mipi dsi dphy bitclk 配置
phy-esc-clock = <76800000>; // mipi dsi dphy escclk 配置
};
};};
display timing配置
根据MIPI DSI panel提供规格书的timing信息填写dpu timing 配置，及mipi dsi timing 配置。其中pixel clock和 bit clock通过timing参数计算获取。
display timing参数说明
HFP: hfront porch(horizon front porch): 水平前肩是指水平同步信号之前的空白时间，用于显示设备进行准备。
HBP: hback porch(horizon back porch): 水平后肩是指水平同步信号之后的空白时间，用于显示设备进行复位和恢复。
HSYNC: hsync pulse: 水平同步信号用于同步显示设备的行扫描，水平同步脉冲宽度表示水平同步信号的持续时间。
VFP: vfront porch(vertical front porch): 垂直前肩是指垂直同步信号之前的空白时间，用于显示设备进行准备。
VBP: vback porch(vertical back porch): 垂直后肩是指垂直同步信号之后的空白时间，用于显示设备进行复位和恢复。
VSYNC: vsync pulse: 垂直同步信号用于同步显示设备的刷新率，垂直同步脉冲宽度表示垂直同步信号的持续时间。
HACTIVE: hactive(Horizon display period): 水平行中有效显示的行像素。
VAVTIVE: vactive(vertical display period): 垂直帧中有效显示的行数。
display timing计算方法
FPS: 帧率，每秒显示的帧数。
Bpp: 位深，每个像素使用的 bit 位数。
htotal: 水平总像素。
Htotal = hactive + HFP + HSYNC pulse + HBP
vtotal: 垂直总像素
vtotal = vactive + VFP + VSYNC pulse + VBP
Pixel clock: 每秒传输或处理像素数据的频率
像素时钟计算方法：
pixel clock = htotal * vtotal * fps = (hactive + hfp + hbp + hsync) * (vactive + vfp + vbp + vsync) * fps
Bit clock: MIPI DSI 数据传输过程中，每 Lane 的数据传输时钟
Bit clock 计算方法：
bit clock = ((htotal * vtotal * fps * bpp) / lane bumber) * 1.1 = (((hactive + hfp + hbp + hsync) * (vactive + vfp + vbp + vsync) * fps * bpp) / lane bumber) * 1.1
DSI clock: MIPI DSI 的 clock lane 实际时钟信号, 采用双边沿采样，一个时钟可以传两个 bit 数据。
dsi clock = bit clock / 2
注意： spacemit 平台计算 MIPI DSI Bit clock 时, 需要乘以系数 1.1。
以MIPI DSI panel型号lcd_gx09inx101_mipi为例： 配置mipi dsi dpu timing及mipi dsi dphy timing。
pixel clock= (hactive + hfp + hbp + hsync) * (vactive + vfp + vbp + vsync) * fps = （1200 + 50 + 40 + 10）* (1920 + 20 + 16 + 4) * 60 = 152880000 HZ
bit clock = (((hactive + hfp + hbp + hsync) * (vactive + vfp + vbp + vsync) * fps * bpp) / lane bumber) * 1.1 = (（（1200 + 50 + 40 + 10）* (1920 + 20 + 16 + 4) * 60 * 24）/ 4) * 1.1 = 1009008000 HZ
通过display timing计算，pixel clock值为152880000 HZ，系统可配置为153000000 HZ，bit clock值为1009008000 HZ，系统可配置为1000000000 HZ。 dts文件中clock-frequency配置为153000000, spacemit-dpu-bitclk和phy-bit-clock配置为1000000000。
// linux-6.6\arch\riscv\boot\dts\spacemit\lcd\lcd_gx09inx101_mipi.dtsi
/ { lcds: lcds {
lcd_gx09inx101_mipi: lcd_gx09inx101_mipi {
// mipi dsi dphy中配置timing
height = <1920>; // mipi dsi dphy中配置屏幕高
width = <1200>; // mipi dsi dphy中配置屏幕宽
hfp = <50>; // mipi dsi dphy中配置水平前肩（Horizontal Front Porch）
hbp = <40>; // mipi dsi dphy中配置水平后肩（Horizontal Back Porch）
hsync = <10>; // mipi dsi dphy中配置水平同步信号（Horizontal Sync）
vfp = <20>; // mipi dsi dphy中配置垂直前肩（Vertical Front Porch）
vbp = <16>; // mipi dsi dphy中配置垂直后肩（Vertical Back Porch）
vsync = <4>; // mipi dsi dphy中配置垂直同步信号（Vertical Sync）
fps = <60>; // mipi dsi dphy中配置帧率
// mipi dsi dpu中配置timing
display-timings {
timing0 {
clock-frequency = <153000000>; // 像素时钟
hactive = <1200>; // 有效显示区域水平像素
hfront-porch = <50>; // hfp
hback-porch = <40>; // hbp
hsync-len = <10>; // hsync
vactive = <1920>; // 有效显示区域垂直像素
vfront-porch = <20>; // vfp
vback-porch = <16>; // vbp
vsync-len = <4>; // vsync
vsync-active = <1>; // vsync信号高电平触发
hsync-active = <1>; // hsync信号高电平触发
};
};
};
};};
已完成功能调试的MIPI DSI panel，相关dtsi文件放置lcd目录。
linux-6.6/arch/riscv/boot/dts/spacemit/lcd$ tree
.
|-- lcd_gc9503v_mipi.dtsi
|-- lcd_gx09inx101_mipi.dtsi
|-- lcd_icnl9911c_mipi.dtsi
|-- lcd_icnl9951r_mipi.dtsi
|-- lcd_jd9365dah3_mipi.dtsi
|-- lcd_jd9365da_mipi_1280x800.dtsi
|-- lcd_lt8911_edp_1920x1080.dtsi
|-- lcd_lt8911_edp_1920x1200.dtsi
|-- lcd_lt9711_dp_1920x1080.dtsi
`-- lcd_orisetech_ota7290b_mipi.dtsi
Panel配置
使能MIPI DSI Panel，需使能MIPI DSI dpu, MIPI DSI host, lcds，配置panel及pwm背光。
以k1-x_deb1方案为例： 使能dpu_online2_dsi，dsi2，lcds, 配置panel为型号lcd_gx09inx101_mipi，配置pwm背光。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x_deb1.dts
&dpu_online2_dsi {
status = "okay"; // 使能MIPI DSI dpu
};
&dsi2 {
status = "okay"; // 使能MIPI DSI host
panel2: panel2@0 {
status = "okay"; // 使能panel
compatible = "spacemit,mipi-panel2";
reg = <0>;
gpios-reset = <81>; // 配置 panel 复位 gpio
gpios-dc = <82 83>; // 配置 panel 电源控制 gpio
id = <2>; // 配置 panel id
delay-after-reset = <10>; // 配置 plane 复位延时时间（单位：ms）
force-attached = "lcd_gx09inx101_mipi"; // 配置 plane 型号
};
};
&lcds {
status = "okay"; // 使能lcds
};
&pwm14 {
status = "okay"; // 使能pwm
};
&pwm_bl { // 使能背光
status = "okay";
};
dts 配置示例
MIPI DSI Panel配置示例：
以MIPI DSI panel型号lcd_gx09inx101_mipi为例： 配置MIPI DSI panel。
// linux-6.6\arch\riscv\boot\dts\spacemit\lcd\lcd_gx09inx101_mipi.dtsi
/ { lcds: lcds {
lcd_gx09inx101_mipi: lcd_gx09inx101_mipi {
dsi-work-mode = <1>; // panel中配置 mipi dsi工作模式：1 DSI_MODE_VIDEO_BURST；
dsi-lane-number = <4>; // panel中配置mipi dsi lane数量
dsi-color-format = "rgb888"; // panel中配置mipi dsi 数据格式
width-mm = <142>; // panel中配置屏幕active area
height-mm = <228>; // panel中配置屏幕active area
use-dcs-write; // panel中配置是否使用dcs命令模式
// mipi dsi dphy中配置timing
height = <1920>; // mipi dsi dphy中配置屏幕高
width = <1200>; // mipi dsi dphy中配置屏幕宽
hfp = <50>; // mipi dsi dphy中配置水平前肩（Horizontal Front Porch）
hbp = <40>; // mipi dsi dphy中配置水平后肩（Horizontal Back Porch）
hsync = <10>; // mipi dsi dphy中配置水平同步信号（Horizontal Sync）
vfp = <20>; // mipi dsi dphy中配置垂直前肩（Vertical Front Porch）
vbp = <16>; // mipi dsi dphy中配置垂直后肩（Vertical Back Porch）
vsync = <4>; // mipi dsi dphy中配置垂直同步信号（Vertical Sync）
fps = <60>; // mipi dsi dphy中配置帧率
work-mode = <0>; // mipi dsi dphy中配置mipi dsi工作模式：0 SPACEMIT_DSI_MODE_VIDEO；
rgb-mode = <3>; // mipi dsi dphy中配置mipi dsi 数据格式：3 DSI_INPUT_DATA_RGB_MODE_888;
lane-number = <4>; // mipi dsi dphy中配置mipi dsi lane数量
phy-bit-clock = <1000000000>; // mipi dsi dphy中配置mipi dsi dphy bit clock
phy-esc-clock = <76800000>; // mipi dsi dphy中配置mipi dsi dphy esc clock
split-enable = <0>; // mipi dsi dphy中配置mipi dsi使能split
eotp-enable = <0>; // mipi dsi dphy中配置mipi dsi使能eotp
burst-mode = <2>; // mipi dsi dphy中配置mipi dsi burst mode: 2 DSI_BURST_MODE_BURST;
esd-check-enable = <0>; // panel中配置使能esd check
// mipi dsi初始化命令序列
/* DSI_CMD, DSI_MODE, timeout, len, cmd */
initial-command = [
39 01 00 02 B0 01
39 01 00 02 C3 4F
39 01 00 02 C4 40
39 01 00 02 C5 40
39 01 00 02 C6 40
39 01 00 02 C7 40
39 01 00 02 C8 4D
39 01 00 02 C9 52
39 01 00 02 CA 51
39 01 00 02 CD 5D
39 01 00 02 CE 5B
39 01 00 02 CF 4B
39 01 00 02 D0 49
39 01 00 02 D1 47
39 01 00 02 D2 45
39 01 00 02 D3 41
39 01 00 02 D7 50
39 01 00 02 D8 40
39 01 00 02 D9 40
39 01 00 02 DA 40
39 01 00 02 DB 40
39 01 00 02 DC 4E
39 01 00 02 DD 52
39 01 00 02 DE 51
39 01 00 02 E1 5E
39 01 00 02 E2 5C
39 01 00 02 E3 4C
39 01 00 02 E4 4A
39 01 00 02 E5 48
39 01 00 02 E6 46
39 01 00 02 E7 42
39 01 00 02 B0 03
39 01 00 02 BE 03
39 01 00 02 CC 44
39 01 00 02 C8 07
39 01 00 02 C9 05
39 01 00 02 CA 42
39 01 00 02 CD 3E
39 01 00 02 CF 60
39 01 00 02 D2 04
39 01 00 02 D3 04
39 01 00 02 D4 01
39 01 00 02 D5 00
39 01 00 02 D6 03
39 01 00 02 D7 04
39 01 00 02 D9 01
39 01 00 02 DB 01
39 01 00 02 E4 F0
39 01 00 02 E5 0A
39 01 00 02 B0 00
39 01 00 02 BD 50
39 01 00 02 C2 08
39 01 00 02 C4 10
39 01 00 02 CC 00
// 39 01 00 02 B2 41 // BIST pattern
39 01 00 02 B0 02
39 01 00 02 C0 00
39 01 00 02 C1 0A
39 01 00 02 C2 20
39 01 00 02 C3 24
39 01 00 02 C4 23
39 01 00 02 C5 29
39 01 00 02 C6 23
39 01 00 02 C7 1C
39 01 00 02 C8 19
39 01 00 02 C9 17
39 01 00 02 CA 17
39 01 00 02 CB 18
39 01 00 02 CC 1A
39 01 00 02 CD 1E
39 01 00 02 CE 20
39 01 00 02 CF 23
39 01 00 02 D0 07
39 01 00 02 D1 00
39 01 00 02 D2 00
39 01 00 02 D3 0A
39 01 00 02 D4 13
39 01 00 02 D5 1C
39 01 00 02 D6 1A
39 01 00 02 D7 13
39 01 00 02 D8 17
39 01 00 02 D9 1C
39 01 00 02 DA 19
39 01 00 02 DB 17
39 01 00 02 DC 17
39 01 00 02 DD 18
39 01 00 02 DE 1A
39 01 00 02 DF 1E
39 01 00 02 E0 20
39 01 00 02 E1 23
39 01 00 02 E2 07
39 01 F0 01 11
39 01 28 01 29
];
// mipi dsi休眠命令序列
sleep-in-command = [
39 01 78 01 28
39 01 78 01 10
];
// mipi dsi唤醒命令序列
sleep-out-command = [
39 01 96 01 11
39 01 32 01 29
];
// mipi dsi read id命令序列
read-id-command = [
37 01 00 01 05
14 01 00 05 fb fc fd fe ff
];
// mipi dsi dpu中配置timing
display-timings {
timing0 {
clock-frequency = <153000000>; // 像素时钟
hactive = <1200>; // 有效显示区域水平像素
hfront-porch = <50>; // hfp
hback-porch = <40>; // hbp
hsync-len = <10>; // hsync
vactive = <1920>; // 有效显示区域垂直像素
vfront-porch = <20>; // vfp
vback-porch = <16>; // vbp
vsync-len = <4>; // vsync
vsync-active = <1>; // vsync信号高电平触发
hsync-active = <1>; // hsync信号高电平触发
};
};
};
};};
方案配置示例：
以k1-x_deb1方案为例： 选择MIPI DSI panel型号lcd_gx09inx101_mipi，配置方案MIPI DSI panel。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x_deb1.dts
&dpu_online2_dsi {
status = "okay"; // 使能mipi dsi dpu
memory-region = <&dpu_resv>; // 配置mipi dsi dpu预留内存
spacemit-dpu-bitclk = <1000000000>; // mipi dsi dpu bitclk 配置
spacemit-dpu-escclk = <76800000>; // mipi dsi dpu escclk 配置
dsi_1v2-supply = <&ldo_5>; // 引用PMIC DLDO
vin-supply-names = "dsi_1v2"; // 配置MIPI DSI 1.2v电源
};
&dsi2 {
status = "okay"; // 使能mipi dsi host
panel2: panel2@0 {
status = "okay"; // 使能panel
compatible = "spacemit,mipi-panel2";
reg = <0>;
gpios-reset = <81>; // panel 复位 gpio
gpios-dc = <82 83>; // panel 电源控制 gpio
id = <2>; // 配置 panel id
delay-after-reset = <10>; // 配置 plane 复位延时时间（单位：ms）
force-attached = "lcd_gx09inx101_mipi"; // 配置 plane 型号
};
};
&lcds {
status = "okay"; // 使能lcds
};
&pwm14 { // 配置pwm
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm14_1>;
status = "okay";
};
&pwm_bl { // 配置背光
pwms = <&pwm14 2000>;
brightness-levels = <
0 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40
40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40
40 40 40 40 40 40 40 40 40 41 42 43 44 45 46 47
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
>;
default-brightness-level = <100>;
status = "okay";
};
HDMI
pinctrl
支持两组 hdmi pinctrl: pinctrl_hdmi_0 和 pinctrl_hdmi_1，仅可选择其中任意一组。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x_pinctrl.dtsi
pinctrl_hdmi_0: hdmi_0_grp {
pinctrl-single,pins = <
K1X_PADCONF(GPIO_86, MUX_MODE1, (EDGE_NONE | PULL_UP | PAD_1V8_DS2)) /* hdmi_tx_hscl */
K1X_PADCONF(GPIO_87, MUX_MODE1, (EDGE_NONE | PULL_UP | PAD_1V8_DS2)) /* hdmi_tx_hsda */
K1X_PADCONF(GPIO_88, MUX_MODE1, (EDGE_NONE | PULL_DOWN | PAD_1V8_DS2)) /* hdmi_tx_hcec */
K1X_PADCONF(GPIO_89, MUX_MODE1, (EDGE_NONE | PULL_DOWN | PAD_1V8_DS2)) /* hdmi_tx_pdp */
>;
};
pinctrl_hdmi_1: hdmi_1_grp {
pinctrl-single,pins = <
K1X_PADCONF(GPIO_59, MUX_MODE1, (EDGE_NONE | PULL_UP | PAD_1V8_DS2)) /* hdmi_tx_hscl */
K1X_PADCONF(GPIO_60, MUX_MODE1, (EDGE_NONE | PULL_UP | PAD_1V8_DS2)) /* hdmi_tx_hsda */
K1X_PADCONF(GPIO_61, MUX_MODE1, (EDGE_NONE | PULL_DOWN | PAD_1V8_DS2)) /* hdmi_tx_hcec */
K1X_PADCONF(GPIO_62, MUX_MODE1, (EDGE_NONE | PULL_DOWN | PAD_1V8_DS2)) /* hdmi_tx_pdp */
>;
};
clock配置
HDMI相关clock配置，包括HDMI DPU相关clock配置，reset配置，及HDMI相关clock配置, reset配置。相关clock参数使用系统默认值，不需在dts文件中配置。
配置平台HDMI DPU相关clock和reset，及HDMI相关clock和reset。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x-hdmi.dtsi
&soc {
display-subsystem-hdmi {
compatible = "spacemit,saturn-hdmi";
reg = <0 0xc0440000 0 0x2A000>;
ports = <&dpu_online2_hdmi>;
interconnects = <&dram_range1>;
interconnect-names = "dma-mem";
};
dpu_online2_hdmi: port@c0440000 {
compatible = "spacemit,dpu-online2";
interrupt-parent = <&intc>;
interrupts = <139>, <138>;
interrupt-names = "ONLINE_IRQ", "OFFLINE_IRQ";
interconnects = <&dram_range1>;
interconnect-names = "dma-mem";
clocks = <&ccu CLK_HDMI>; // hdmi dpu hmclk 配置
clock-names = "hmclk";
resets = <&reset RESET_HDMI>; // hdmi dpu reset 配置
reset-names= "hdmi_reset";
power-domains = <&power K1X_PMU_HDMI_PWR_DOMAIN>;
pipeline-id = <ONLINE2>;
ip = "spacemit-saturn";
type = <HDMI>;
clk,pm-runtime,no-sleep;
status = "disabled";
dpu_online2_hdmi_out: endpoint@0 {
remote-endpoint = <&hdmi_in>;
};
};
hdmi: hdmi@C0400500 {
compatible = "spacemit,hdmi", "simple-bus";
#address-cells = <2>;
#size-cells = <2>;
ranges;
reg = <0 0xC0400500 0 0x200>;
interrupt-parent = <&intc>;
interrupts = <136>;
clocks = <&ccu CLK_HDMI>; // hdmi hmclk 配置
clock-names = "hmclk";
resets = <&reset RESET_HDMI>; // hdmi reset 配置
reset-names= "hdmi_reset";
power-domains = <&power K1X_PMU_HDMI_PWR_DOMAIN>;
clk,pm-runtime,no-sleep;
status = "disabled";
port {
#address-cells = <1>;
#size-cells = <0>;
hdmi_in: endpoint@0 {
reg = <0>;
remote-endpoint = <&dpu_online2_hdmi_out>;
};
};
};
};
dts 配置示例
以k1-x_deb1方案为例，方案中配置HDMI。
// linux-6.6\arch\riscv\boot\dts\spacemit\k1-x_deb1.dts
&dpu_online2_hdmi {
memory-region = <&dpu_resv>; // 配置hdmi dpu预留内存
status = "okay";
};
&hdmi{
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hdmi_0>;
status = "okay";
};
接口描述
测试介绍
libdrm是一个用户空间库，提供了与 DRM 驱动进行交互的 API。通过libdrm开发者可以直接与 DRM 设备进行通信，执行各种操作，如创建和管理 framebuffer、设置显示模式、处理图层等。modetest 是一个使用 libdrm 库的测试工具，通常用于测试和验证 DRM 驱动的功能。
通过modetest工具运行DRM驱动测试用例。
# modetest -M spacemit
Encoders:
id crtc type possible crtcs possible clones
129 127 DSI 0x00000001 0x00000001
Connectors:
id encoder status name size (mm) modes encoders
130 129 connected DSI-1 142x228 1 129
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 1200x1920 60.05 1200 1250 1260 1300 1920 1940 1944 1960 153000 flags: phsync, pvsync; type: preferred, driver
props:
1 EDID:
flags: immutable blob
blobs:
value:
2 DPMS:
flags: enum
enums: On=0 Standby=1 Suspend=2 Off=3
value: 0
5 link-status:
flags: enum
enums: Good=0 Bad=1
value: 0
6 non-desktop:
flags: immutable range
values: 0 1
value: 0
4 TILE:
flags: immutable blob
blobs:
value:
CRTCs:
id fb pos size
127 132 (0,0) (1200x1920)
#0 1200x1920 60.05 1200 1250 1260 1300 1920 1940 1944 1960 153000 flags: phsync, pvsync; type: preferred, driver
props:
24 VRR_ENABLED:
flags: range
values: 0 1
value: 0
Planes:
id crtc fb CRTC x,y x,y gamma size possible crtcs
31 127 132 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 1
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
33 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
34 zpos:
flags: immutable range
values: 0 0
value: 0
35 alpha:
flags: range
values: 0 65535
value: 65535
36 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
37 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 0
38 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
41 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
42 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
43 127 134 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 2
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
45 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
46 zpos:
flags: immutable range
values: 1 1
value: 1
47 alpha:
flags: range
values: 0 65535
value: 65535
48 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
49 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 1
50 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
53 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
54 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
55 0 0 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 0
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
57 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
58 zpos:
flags: immutable range
values: 2 2
value: 2
59 alpha:
flags: range
values: 0 65535
value: 65535
60 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
61 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 4294967295
62 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
65 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
66 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
67 0 0 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 0
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
69 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
70 zpos:
flags: immutable range
values: 3 3
value: 3
71 alpha:
flags: range
values: 0 65535
value: 65535
72 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
73 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 4294967295
74 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
77 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
78 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
79 0 0 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 0
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
81 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
82 zpos:
flags: immutable range
values: 4 4
value: 4
83 alpha:
flags: range
values: 0 65535
value: 65535
84 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
85 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 4294967295
86 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
89 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
90 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
91 0 0 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 0
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
93 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
94 zpos:
flags: immutable range
values: 5 5
value: 5
95 alpha:
flags: range
values: 0 65535
value: 65535
96 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
97 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 4294967295
98 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
101 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
102 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
103 0 0 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 0
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
105 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
106 zpos:
flags: immutable range
values: 6 6
value: 6
107 alpha:
flags: range
values: 0 65535
value: 65535
108 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
109 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 4294967295
110 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
113 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
114 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
115 0 0 0,0 0,0 0 0x00000001
formats: AB30 AR24 AB24 RA24 BA24 XR24 XB24 RX24 BX24 RG16 BG16 YU08 NV12 P010
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 0
30 IN_FORMATS:
flags: immutable blob
blobs:
value:
01000000000000000e00000018000000
01000000500000004142333041523234
41423234524132344241323458523234
58423234525832344258323452473136
42473136595530384e56313250303130
ff3f0000000000000000000000000000
0000000000000000
in_formats blob decoded:
AB30: LINEAR
AR24: LINEAR
AB24: LINEAR
RA24: LINEAR
BA24: LINEAR
XR24: LINEAR
XB24: LINEAR
RX24: LINEAR
BX24: LINEAR
RG16: LINEAR
BG16: LINEAR
YU08: LINEAR
NV12: LINEAR
P010: LINEAR
117 rotation:
flags: bitmask
values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20
value: 1
118 zpos:
flags: immutable range
values: 7 7
value: 7
119 alpha:
flags: range
values: 0 65535
value: 65535
120 pixel blend mode:
flags: enum
enums: None=2 Pre-multiplied=0 Coverage=1
value: 0
121 RDMA_ID:
flags: range
values: 0 18446744073709551615
value: 4294967295
122 SOLID_COLOR:
flags: range
values: 0 18446744073709551615
value: 0
125 COLOR_ENCODING:
flags: enum
enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 ITU-R BT.2020 YCbCr=2
value: 0
126 COLOR_RANGE:
flags: enum
enums: YCbCr limited range=0 YCbCr full range=1
value: 0
Frame buffers:
id size pitch
# modetest -M spacemit -s 130@127:1200x1920
setting mode 1200x1920-60.05Hz on connectors 130, crtc 127
API介绍
DRM驱动API介绍请参考linux内核文档（https://docs.kernel.org/gpu/drm-kms.html）
Debug介绍
debugfs
MIPI DSI debugfs节点
# cd /sys/kernel/debug/dri/1
# ls
DSI-1 crtc-0 gem_names state
bridge_chains dump internal_clients
clients framebuffer name
HDMI debugfs节点
# cd /sys/kernel/debug/dri/2
# ls
HDMI-A-1 crtc-0 gem_names state
bridge_chains dump internal_clients
clients framebuffer name
查看framebuffer信息
# cd /sys/kernel/debug/dri/1
# cat framebuffer
framebuffer[132]:
allocated by = weston
refcount=2
format=XR24 little-endian (0x34325258)
modifier=0x0
size=1200x1920
layers:
size[0]=1200x1920
pitch[0]=4800
offset[0]=0
obj[0]:
name=0
refcount=3
start=0010119c
size=9216000
imported=no
framebuffer[135]:
allocated by = weston
refcount=1
format=XR24 little-endian (0x34325258)
modifier=0x0
size=1200x1920
layers:
size[0]=1200x1920
pitch[0]=4800
offset[0]=0
obj[0]:
name=0
refcount=3
start=001008d2
size=9216000
imported=no
framebuffer[134]:
allocated by = weston
refcount=1
format=AR24 little-endian (0x34325241)
modifier=0x0
size=64x64
layers:
size[0]=64x64
pitch[0]=256
offset[0]=0
obj[0]:
name=0
refcount=3
start=001008ce
size=16384
imported=no
framebuffer[133]:
allocated by = weston
refcount=1
format=AR24 little-endian (0x34325241)
modifier=0x0
size=64x64
layers:
size[0]=64x64
pitch[0]=256
offset[0]=0
obj[0]:
name=0
refcount=3
start=001008ca
size=16384
imported=no
framebuffer[131]:
allocated by = [fbcon]
refcount=1
format=XR24 little-endian (0x34325258)
modifier=0x0
size=1200x1920
layers:
size[0]=1200x1920
pitch[0]=4800
offset[0]=0
obj[0]:
name=0
refcount=2
start=00100000
size=9216000
imported=no
dump当前显示的buffer
# cd /sys/class/drm/card1-DSI-1
# cat dump
[ 436.711209] [drm] framebuffer[135]
[ 436.752130] [drm] dump framebuffer: /tmp/plane31_fb135_XR24_planes0_1200x1920.rgb
[ 436.759796] [drm] framebuffer[134]
[ 436.763663] [drm] dump framebuffer: /tmp/plane43_fb134_AR24_planes0_64x64.rgb
查看连接状态
# cd /sys/class/drm/card1-DSI-1
# cat status
connected
查看支持的显示模式
# cd /sys/class/drm/card1-DSI-1
# cat modes
1200x1920