RK3588 MIPI Panel Debugging: RK3588-MIPI-DSI LCD Power up Initialization Sequence
1. Introduction
- For MIPI panels, the power on init sequence (panel-init-sequence) and power off sequence (panel-exit-sequence) are usually configured in the dts file on Rockchip platforms. This article explains how to configure these initialization sequences for the panel.
2. Environment Introduction
-
Hardware:
ArmSoM-W3 RK3588 dev board, MIPI-DSI panel (ArmSoM official accessory) -
Software Version:
OS: ArmSoM-W3 Debian11
3.Data Types
3.1 Common data type1 ：DCS Write
Note: The parameter here does not refer to the number of data bytes.
0x05 Command type: Single byte data (DCS Short Write, no parameters)
0x15 Command type: Two byte data (DCS Short Write, 1 parameter)
0x39 Command type: Multi byte data (DCS Long Write, n parameters n > 2)
0x05 Command type：(DCS Short Write, no parameters)
05 95 01 11
05 95 01 29
0x15 Command type：(DCS Short Write, 1 parameter)
15 00 02 80 77
| | | | |
| | | | data
| | | | Register Address
| | Payload Length
| Delay
Command type（0x05: Single byte data 0x15:Two byte data 0x39:Multi byte data）
Analysis：
Data Type: 0x15 (0x15 data type - DCS Short Write, 1 parameter)
Delay: 0x00 (Delay in ms after completing sending current packet before starting next command)
Payload Length: 0x02 (Payload length is 2 bytes)
Payload: 0x80 0x77 (Payload data)
0x39 command type is with multiple parameters, more than two parameters (DCS Long Write / write_LUT Command Packet)
39 00 06 FF 77 01 00 00 10
39 00 03 C0 63 00
39 00 03 C1 11 02
3.2 Common data type 2 ：Generic Write
Note: The parameter here does not refer to the number of data bytes.
0x03 Command type: Single byte data (Generic Short Write, no parameters)
0x13 Command type: Two byte data (Generic Short Write, 1 parameter)
0x23 Command type: Three byte data (Generic Short Write, 2 parameters)
0x29 Command type: Multi byte data (Generic Long Write, n parameters n > 2)
4. Rockchip Platform Power on Initialization Sequence Configuration
There are panel manufacturer’s MIPI panel initialization code as follows
params->dsi.vertical_sync_active=2
params->dsi.vertical_backporch=10
params->dsi.vertical_frontporch=14
params->dsi.horizontal_sync_active=24
params->dsi.horizontal_backporch=80
params->dsi.horizontal_frontporch=60
params->dsi.PLL_CLOCK=478
LCD_nReset=1;
Delayms(5);
LCD_nReset=0;
Delayms(20);//10
LCD_nReset=1;
Delayms(200);//120
Generic_Short_Write_1P(0xB0,0x01);
Generic_Short_Write_1P(0xC0,0x26);
Generic_Short_Write_1P(0xC1,0x10);
Generic_Short_Write_1P(0xC2,0x0E);
Generic_Short_Write_1P(0xC3,0x00);
Generic_Short_Write_1P(0xC4,0x00);
Generic_Short_Write_1P(0xC5,0x23);
Generic_Short_Write_1P(0xC6,0x11);
Generic_Short_Write_1P(0xC7,0x22);
Generic_Short_Write_1P(0xC8,0x20);
Generic_Short_Write_1P(0xC9,0x1E);
Generic_Short_Write_1P(0xCA,0x1C);
Generic_Short_Write_1P(0xCB,0x0C);
Generic_Short_Write_1P(0xCC,0x0A);
Generic_Short_Write_1P(0xCD,0x08);
Generic_Short_Write_1P(0xCE,0x06);
Generic_Short_Write_1P(0xCF,0x18);
Generic_Short_Write_1P(0xD0,0x02);
Generic_Short_Write_1P(0xD1,0x00);
Generic_Short_Write_1P(0xD2,0x00);
Generic_Short_Write_1P(0xD3,0x00);
Generic_Short_Write_1P(0xD4,0x26);
Generic_Short_Write_1P(0xD5,0x0F);
Generic_Short_Write_1P(0xD6,0x0D);
Generic_Short_Write_1P(0xD7,0x00);
Generic_Short_Write_1P(0xD8,0x00);
Generic_Short_Write_1P(0xD9,0x23);
Generic_Short_Write_1P(0xDA,0x11);
Generic_Short_Write_1P(0xDB,0x21);
Generic_Short_Write_1P(0xDC,0x1F);
Generic_Short_Write_1P(0xDD,0x1D);
Generic_Short_Write_1P(0xDE,0x1B);
Generic_Short_Write_1P(0xDF,0x0B);
Generic_Short_Write_1P(0xE0,0x09);
Generic_Short_Write_1P(0xE1,0x07);
Generic_Short_Write_1P(0xE2,0x05);
Generic_Short_Write_1P(0xE3,0x17);
Generic_Short_Write_1P(0xE4,0x01);
Generic_Short_Write_1P(0xE5,0x00);
Generic_Short_Write_1P(0xE6,0x00);
Generic_Short_Write_1P(0xE7,0x00);
Generic_Short_Write_1P(0xB0,0x03);
Generic_Short_Write_1P(0xBE,0x04);
Generic_Short_Write_1P(0xB9,0x40);
Generic_Short_Write_1P(0xCC,0x88);
Generic_Short_Write_1P(0xC8,0x0C);
Generic_Short_Write_1P(0xC9,0x07);
Generic_Short_Write_1P(0xCD,0x01);
Generic_Short_Write_1P(0xCA,0x40);
Generic_Short_Write_1P(0xCE,0x1A);
Generic_Short_Write_1P(0xCF,0x60);
Generic_Short_Write_1P(0xD2,0x08);
Generic_Short_Write_1P(0xD3,0x08);
Generic_Short_Write_1P(0xDB,0x01);
Generic_Short_Write_1P(0xD9,0x06);
Generic_Short_Write_1P(0xD4,0x00);
Generic_Short_Write_1P(0xD5,0x01);
Generic_Short_Write_1P(0xD6,0x04);
Generic_Short_Write_1P(0xD7,0x03);
Generic_Short_Write_1P(0xC2,0x00);
Generic_Short_Write_1P(0xC3,0x0E);
Generic_Short_Write_1P(0xC4,0x00);
Generic_Short_Write_1P(0xC5,0x0E);
Generic_Short_Write_1P(0xDD,0x00);
Generic_Short_Write_1P(0xDE,0x0E);
Generic_Short_Write_1P(0xE6,0x00);
Generic_Short_Write_1P(0xE7,0x0E);
Generic_Short_Write_1P(0xC2,0x00);
Generic_Short_Write_1P(0xC3,0x0E);
Generic_Short_Write_1P(0xC4,0x00);
Generic_Short_Write_1P(0xC5,0x0E);
Generic_Short_Write_1P(0xDD,0x00);
Generic_Short_Write_1P(0xDE,0x0E);
Generic_Short_Write_1P(0xE6,0x00);
Generic_Short_Write_1P(0xE7,0x0E);
Generic_Short_Write_1P(0xB0,0x06);
Generic_Short_Write_1P(0xC0,0xA5);
Generic_Short_Write_1P(0xD5,0x1C);
Generic_Short_Write_1P(0xC0,0x00);
Generic_Short_Write_1P(0xB0,0x00);
Generic_Short_Write_1P(0xBD,0x30);//VCOM 37
Generic_Short_Write_1P(0xF9,0x5C);
Generic_Short_Write_1P(0xC2,0x14);
Generic_Short_Write_1P(0xC4,0x14);
Generic_Short_Write_1P(0xBF,0x15);
Generic_Short_Write_1P(0xC0,0x0C);
Generic_Short_Write_1P(0xB0,0x00);
Generic_Short_Write_1P(0xB1,0x79);
Generic_Short_Write_1P(0xBA,0x8F);//
DCS_Short_Write_NP(0x11);
Delay(200);
DCS_Short_Write_NP(0x29);
Delay(50);
4.1 Analyze the MIPI Panel Initialization Code Provided by the Customer:
Generic_Short_Write_1P(0xBA,0x8F);
Generic_Short_Write_1P indicates: Send Generic command with 1 parameter, data byte length is 2 (Generic Short Write, 1 parameter)
0xBA: Register address
0x8F: Data 1 is 0x8F
- Convert to MIPI panel initialization format on Rockchip DTS:****
13 00 02 BA 8F
Analysis:
13 indicates 0x13 data type command
00 indicates no delay
02 indicates two data bytes: 0xBA, 0x8F
BA is register address 0xBA
8F is data 0x8F
- Analyze customer’s MIPI panel initialization code:
DCS_Short_Write_NP(0x11);
Delay(200);
DCS_Short_Write_NP(0x29);
Delay(50);
Analysis:
DCS_Short_Write_NP means: Only send DCS command, no parameters, data byte length is 1 (DCS Short Write, no parameters)
0x11: Data 1 is 0x11
Delay(200): Delay 200 ms
- Convert to MIPI panel initialization format on RK DTS:
05 C8 01 11
05 32 01 29
Analysis:
05 indicates 0x05 data type command
C8 indicates delay of 200 in hex is 0xC8
01 indicates 1 data byte: 0x11
11 is the data: 0x11
4.2 Convert the Panel Vendor’s Initialization Code to Rockchip Platform’s Power up Sequence DTS Configuration:
panel-init-sequence = [
13 00 02 B0 01
13 00 02 C0 26
13 00 02 C1 10
13 00 02 C2 0E
13 00 02 C3 00
13 00 02 C4 00
13 00 02 C5 23
13 00 02 C6 11
13 00 02 C7 22
13 00 02 C8 20
13 00 02 C9 1E
13 00 02 CA 1C
13 00 02 CB 0C
13 00 02 CC 0A
13 00 02 CD 08
13 00 02 CE 06
13 00 02 CF 18
13 00 02 D0 02
13 00 02 D1 00
13 00 02 D2 00
13 00 02 D3 00
13 00 02 D4 26
13 00 02 D5 0F
13 00 02 D6 0D
13 00 02 D7 00
13 00 02 D8 00
13 00 02 D9 23
13 00 02 DA 11
13 00 02 DB 21
13 00 02 DC 1F
13 00 02 DD 1D
13 00 02 DE 1B
13 00 02 DF 0B
13 00 02 E0 09
13 00 02 E1 07
13 00 02 E2 05
13 00 02 E3 17
13 00 02 E4 01
13 00 02 E5 00
13 00 02 E6 00
13 00 02 E7 00
13 00 02 B0 03
13 00 02 BE 04
13 00 02 B9 40
13 00 02 CC 88
13 00 02 C8 0C
13 00 02 C9 07
13 00 02 CD 01
13 00 02 CA 40
13 00 02 CE 1A
13 00 02 CF 60
13 00 02 D2 08
13 00 02 D3 08
13 00 02 DB 01
13 00 02 D9 06
13 00 02 D4 00
13 00 02 D5 01
13 00 02 D6 04
13 00 02 D7 03
13 00 02 C2 00
13 00 02 C3 0E
13 00 02 C4 00
13 00 02 C5 0E
13 00 02 DD 00
13 00 02 DE 0E
13 00 02 E6 00
13 00 02 E7 0E
13 00 02 C2 00
13 00 02 C3 0E
13 00 02 C4 00
13 00 02 C5 0E
13 00 02 DD 00
13 00 02 DE 0E
13 00 02 E6 00
13 00 02 E7 0E
13 00 02 B0 06
13 00 02 C0 A5
13 00 02 D5 1C
13 00 02 C0 00
13 00 02 B0 00
13 00 02 BD 30
13 00 02 F9 5C
13 00 02 C2 14
13 00 02 C4 14
13 00 02 BF 15
13 00 02 C0 0C
13 00 02 B0 00
13 00 02 B1 79
13 00 02 BA 8F
05 C8 01 11
05 32 01 29
];
panel-exit-sequence = [
05 00 01 28
05 00 01 10
];