Neoway S720 Manuel utilisateur

LCD Commissioning Guide

Issue 1.0

S720 LCD Commissioning Guide

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Notice

This document provides guide for users to use S720.

This document is intended for system engineers (SEs), development engineers, and test engineers.

THIS GUIDE PROVIDES INSTRUCTIONS FOR CUSTOMERS TO DESIGN THEIR APPLICATIONS.

PLEASE FOLLOW THE RULES AND PARAMETERS IN THIS GUIDE TO DESIGN AND COMMISSION.

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S720 LCD Commissioning Guide

Contents

iii

Contents

1 LCD Architecture Overview .......................................................................5

2 u-boot ........................................................................................................6

2.1 Adding the LCD Driver File........................................................................................................... 6

2.2 Adding Macro Control for LCD Compilation ................................................................................. 7

2.3 Adding LCD Compilation Rules.................................................................................................... 7

3 Modifying the Kernel..................................................................................9

3.1 Adding the LCD Driver File........................................................................................................... 9

3.2 Modifying the LCD Driver File ...................................................................................................... 9

3.3 Referencing the LCD Driver File .................................................................................................11

4 Timing Description ...................................................................................13

4.1 Generating Timing...................................................................................................................... 13

4.2 Confirming Timing ...................................................................................................................... 15

S720 LCD Commissioning Guide

About This Document

Scope

This document is applicable to the S720 series. It describes how to configure the LCD drivers.

Audience

This document is intended for system engineers (SEs), development engineers, and test engineers.

Change History

Issue

Change

Changed By

1.0

Initial draft

Leo Shen

Conventions

Symbol

Indication

Indicates danger or warning. This information must be followed. Otherwise, a

catastrophic module or user device failure or bodily injury may occur.

Indicates caution. This symbol alerts the user to important points about using the

module. If these points are not followed, the module or user device may fail.

Indicates instructions or tips. This symbol provides advices or suggestions that

may be useful when using the module.

S720 LCD Commissioning Guide

Chapter 1 LCD Architecture Overview

1 LCD Architecture Overview

⚫Platform: SL8541E

⚫System: Android 10

⚫LCD: st7703, 720x1280, RGB888, MIPI-4lane

⚫Backlight: PWM + backlight boost chip

The display driver module mainly consists of DPU, DSI, and DPHY. The core module DPU is related

to display and is mainly responsible for layer composition, image transformation, and screen refresh.

The DSI and DPHY are related to communication and are responsible for packaging and transmitting

data. The upper-level program draws the image to be displayed and writes it to the DDR buffer, and

then the DPU retrieves the data from the buffer, synthesizes it, and sends it to the DSI for packaging.

The DPHY sends the packaged data to the panel through the MIPI bus for display, as shown below.

The LCD driver addition process consists of two parts: u-boot and kernel.

S720 LCD Commissioning Guide

Chapter 2 u-boot

2 u-boot

2.1 Adding the LCD Driver File

Step 1: Copy the existing LCD driver file in the following directory:

bsp\bootloader\uboot15\drivers\video\sprd\lcd\

Step 2: Rename the LCD driver file according to the following naming convention. The format is as

follows:

lcd_[DriverIC]_[ModuleVendor]_[BusType]_[Resolution].c

lcd_st7703_rt_mipi_hd_nwy.c

Step 3: Modifying the LCD Driver File

1. Replace all ID-related functions and variable names in the driver file with st7703.

2. Configure the initialization code (provided by the module factory) using the following format:

Step 4: Configure the front and rear porch parameters (the panel_info structure and parameters are

provided by the panel manufacturer), as shown below.

S720 LCD Commissioning Guide

Chapter 2 u-boot

lcd_name is the node name. The lcd dts node name in u-boot and the kernel must be the same, otherwise the

kernel cannot match the correct LCD driver.

Step 5: Implement the panel_ops callback function, as shown below.

static struct panel_ops st7703_ops = {

.init = st7703_init,

.read_id = st7703_readid,

.power = st7703_power,

};

Step 6: Register the panel driver, as shown below.

struct panel_driver st7703_rt_mipi_driver = {

.info = &st7703_info,

.ops = &st7703_ops,

};

2.2 Adding Macro Control for LCD Compilation

After adding and configuring the LCD driver file, you can open the added new LCD module in the board

configuration file.

Take the S720 project as an example. Find the configuration header file of the corresponding project

in u-boot, and add the LCD compilation macro control:

bsp\bootloader\u-boot15\include\configs\S720.h

#define CONFIG_LCD_ST7703_RT_MIPI_HD

2.3 Adding LCD Compilation Rules

Step 1: Modify the LCD Makefile:

u-boot15/drivers/video/sprd/lcd/Makefile

obj-$(CONFIG_LCD_ST7703_RT_MIPI_HD) += lcd_st7703_rt_mipi_hd_nwy.o

Step 2: Modify the LCD configuration file.

// Configure the file path

bsp\bootloader\u-boot15\drivers\video\sprd\lcd\panel_cfg.h

// add the Entrance instructions for the LCD driver

S720 LCD Commissioning Guide

Chapter 2 u-boot

#ifdef CONFIG_LCD_ST7703_RT_MIPI_HD

extern struct panel_driver st7703_rt_mipi_driver;

#endif

// Add reference

static struct panel_cfg supported_panel[] = {

#ifdef CONFIG_LCD_ST7703_RT_MIPI_HD

{

.lcd_id = 0x7703,

.drv = &st7703_rt_mipi_driver,

#endif

...

}

⚫lcd_id: built-in lcd id, which is used to read the ID to confirm the model.

⚫drv: pointer to the LCD panel driver structure, which points to the driver structure. Associate the

driver structure with supported_panel. During startup, u-boot enumerates the display in this

structure until the readid function of a driver returns success.

S720 LCD Commissioning Guide

Chapter 3 Modifying the Kernel

3 Modifying the Kernel

The configuration of the LCD kernel adopts the new display framework DRM. In the new Android

version, the framework is gradually migrated from ADF to DRM. Starting from the kernel 4.14, the

display framework is gradually migrated to DRM. The panel is now customized through LCD DTS, the

unified SPRD generic panel driver is used, and the modification of the customized driver is currently

not supported.

3.1 Adding the LCD Driver File

1. Copy the existing driver file in the following directory:

bsp\kernel\kernel4.14\arch\arm\boot\dts\lcd\

2. Rename the LCD driver file according to the following naming convention.

For example:

lcd_[DriverIC]_[ModuleVendor]_[BusType]_[Resolution].dtsi

lcd_st7703_rt_mipi_hd_nwy.dtsi

3.2 Modifying the LCD Driver File

Step 1: Rename all the original LCD related names in the old DTSI file. Replace them with

xxx_st7703_xxx.

Step 2: Configure the initialization code (provided by the module factory) using the following format:

Step 3: Configure the DTS attributes.

S720 LCD Commissioning Guide

Chapter 3 Modifying the Kernel

The reference settings are shown below, and the parameters should be consistent with the

configuration on the uboot. The parameters listed in the following table must be configured.

Other parameters can be configured according to the actual situation, or you can consult

Neoway technical support.

Properties

Description

Remarks

lcd_st7703_rt_mipi_hd

LCD node name

It must be consistent with the lcd

name in u-boot, otherwise the kernel

cannot match the correct LCD driver.

sprd,dsi-work-mode

DSI mode used by the LCD to

transmit image data.

Currently, the following values

are supported:

0: cmd mode

1: video burst mode (Default)

2: video non-burst mode with

sync pulse(2)

3: video non-burst mode with

sync event(3)

Confirm the DSI mode based on the

LCD specifications.

Most LCDs use the video mode.

sprd,dsi-lane-number

Total number of data lanes

when the LCD receives the

transmitted video data. The

value ranges from 1 to 4.

Confirm the DSI mode based on the

LCD specifications.

sprd,dsi-color-format

Data format used for video

stream transmission.

Currently, the following

values are supported:

rgb888, rgb666,

rgb666_packed, rgb565,

and dsc.

The default format rgb888.

Confirm the setting based on the

LCD specifications.

sprd,phy-bit-clock

Bit clock, that is, total LCD

data clock

It is calculated and filled by the timing

table.

For details, see Chapter xx.

sprd,reset-on-sequence

Reset sequence before the

LCD is turned on

Confirm the setting based on the

LCD specifications. The sequence is

usually high, low, and high.

sprd,reset-off-sequence

Reset sequence before the

LCD is turned off

Confirm the DSI mode based on the

LCD specifications. The sequence is

usually constant low.

sprd,initial-command

LCD initialization code

It is provided by the module factory

and filled based on the format.

For details, see section 3.2.

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