2025年ST7703 LCM显示屏调试--基于MT6765

大家好，我是讯享网，很高兴认识大家。

参考

st7703_hd720_dsi_vdo驱动
MTK驱动-----添加lcm液晶驱动
在mt6735平台下驱动LCD显示屏步骤
各种屏幕分辨率
基于MTK平台LCM的移植
mtk-lk display代码分析

Kernel驱动加载流程

mtkfb驱动

mtkfb驱动通过数据结构platform_driver挂接的到platform总线上。

2890 static struct platform_driver mtkfb_driver = { 2891 .probe = mtkfb_probe, 2892 .remove = mtkfb_remove, 2893 .suspend = mtkfb_suspend, 2894 .resume = mtkfb_resume, 2895 .shutdown = mtkfb_shutdown, 2896 2897 .driver = { 2898 .name = MTKFB_DRIVER, 2899 #ifdef CONFIG_PM 2900 .pm = &mtkfb_pm_ops, 2901 #endif 2902 .bus = &platform_bus_type, 2903 .of_match_table = mtkfb_of_ids, 2904 }, 2905 };

讯享网

mtkfb_probe(xxx) drivers/misc/mediatek/video/mt6765/videox/mtkfb.c
- primary_display_init(xxx) drivers/misc/mediatek/video/mt6765/videox/primary_display.c
  - disp_lcm_probe(xxx) drivers/misc/mediatek/video/mt6765/videox/disp_lcm.c
    - lcm_drv = lcm_driver_list[i];加载st7703_hd720_dsi_vdo_lcm_drv模组 drivers/misc/mediatek/lcm/mt65xx_lcm_list.c
lcm驱动模组

讯享网struct LCM_DRIVER st7703_hd720_dsi_vdo_lcm_drv ={ .name = "st7703_hd720_dsi_vdo", .set_util_funcs = lcm_set_util_funcs, .get_params = lcm_get_params, .init = lcm_init, .suspend = lcm_suspend, .resume = lcm_resume, .compare_id = lcm_compare_id, };

primary_display_init其实和lk是一样的，但是如果lk初始化过LCD，kernel就不会重复再初始化，根据flag is_lcm_inited判定。

primary_display_init: 3965 if (is_lcm_inited) { 3966 /* ??? why need */ 3967 /* no need lcm power on,because lk power on lcm */ 3968 /* ret = disp_lcm_init(pgc->plcm, 0); */ 3969 } else { 3970 /* lcm not inited: 3971 * 1. fpga no lk(verify done); 3972 * 2. evb no lk(need verify) 3973 */ 3974 if (use_cmdq) { 3975 /* make sure dsi configuration done before lcm init */ 3976 _cmdq_flush_config_handle(1, NULL, 0); 3977 _cmdq_reset_config_handle(); 3978 } 3979 3980 ret = disp_lcm_init(pgc->plcm, 1); 3981 }

kernel阶段打印

讯享网[ 27.] <1>.(0)[271:kworker/0:2][name:ddp_drv&]disp driver(1) disp_probe end [ 27.] <1>.(0)[271:kworker/0:2][name:ddp_drv&]disp driver(1) disp_probe_1 begin [ 27.] <1>.(0)[271:kworker/0:2][name:ddp_drv&]disp driver(1) disp_probe_1 end [ 27.] <1>.(0)[271:kworker/0:2][name:bootprof&][name:bootprof&]BOOTPROF: 27627.:probe: probe=platform_drv_probe drv=DISPSYS(dispsys_of_driver) 21.ms [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb]isvideofb_parse_done = 0 [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb] islcmfound = 1 [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb] is_lcm_inited = 1 [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb] fps = 5750 [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb] fb_base = 0x7f0e0000 [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb] vram = 0xe20000 () [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb] lcmname = st7703_hd720_dsi_vdo_drv [ 27.] <1>.(0)[271:kworker/0:2][name:ddp_m4u&]disphal_allocate_fb, pa_start=0x0x000000007f0e0000, pa_end=0x0x000000007fefffff, va=0xffffff800e000000 [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb]isvideofb_parse_done = 1 [ 27.] <1>.(0)[271:kworker/0:2][DISP]primary_display_init begin lcm=st7703_hd720_dsi_vdo_drv, inited=1 [ 27.] <1>.(0)[271:kworker/0:2][name:mmprofile&][name:mmprofile&]MMP: mmprofile_enable(): enable: 1 [ 27.] <1>.(0)[271:kworker/0:2][name:mmprofile&][name:mmprofile&]MMP: mmprofile_force_start(): start: 1 [ 27.] <1>.(0)[271:kworker/0:2][DISP]plcm_name=st7703_hd720_dsi_vdo_drv is_lcm_inited 1 [ 27.] <1>.(0)[271:kworker/0:2][wugn]enter disp_lcm_probe plcm_name =  [ 27.] <1>.(0)[271:kworker/0:2][name:st7703_hd720_dsi_vdo&][KERNEL/LCM][wugn]enter lcm_get_params [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] name: st7703_hd720_dsi_vdo_drv [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] resolution: 720 x 1440 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] physical size: 74 x 132 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] physical size: 74 x 132 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] interface: unknown [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] Type: DSI [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] DSI Mode: SYNC_PULSE_VDO_MODE [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] LANE_NUM: 4 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] vact: 4, vbp: 19, vfp: 18, vact_line: 1440, hact: 20, hbp: 20, hfp: 20, hblank: 0 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] pll_select: 0, pll_div1: 0, pll_div2: 0, fbk_div: 0,fbk_sel: 0, rg_bir: 0 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] rg_bic: 0, rg_bp: 0,PLL_CLOCK: 208, dsi_clock: 0, ssc_range: 0,ssc_disable: 1 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM]compatibility_for_nvk: 0, cont_clock: 0 [ 27.] <1>.(0)[271:kworker/0:2][DISP][LCM] lcm_ext_te_enable: 0, noncont_clock: 0, noncont_clock_period: 0 [ 27.] <1>.(0)[271:kworker/0:2][DISP]disp_lcm_probe SUCCESS [ 27.] <1>.(0)[271:kworker/0:2] [ 27.] <1>.(0)[271:kworker/0:2][wugn]enter disp_lcm_get_params [ 27.] <1>.(0)[271:kworker/0:2] [ 27.] <1>.(0)[271:kworker/0:2][DISP][DT][videolfb]isvideofb_parse_done = 1 [ 27.] <1>.(0)[271:kworker/0:2][DISP]dsi0 initializing _dsi_context [ 27.] <1>.(0)[271:kworker/0:2] [ 27.] <1>.(0)[271:kworker/0:2]444 [ 27.] <1>.(0)[271:kworker/0:2] [ 27.] <1>.(0)[271:kworker/0:2][DISP]primary_display_init->dpmgr_path_start [ 27.] <1>.(0)[271:kworker/0:2][name:ddp_gamma&][GAMMA] disp_gamma_write_lut_reg: table [0] not initialized [ 27.] <1> [ 27.] <1>.(0)[271:kworker/0:2]66 [ 27.] <1>.(4)[292:init_decouple_b][name:primary_display&]init_decouple_buffers done [ 27.] <1>.(0)[271:kworker/0:2][name:mtk_sodi&]Power/swap - mtk_idle_disp_is_ready not support anymore! [ 27.] <1>.(0)[271:kworker/0:2][name:cmdq_mdp_common&][CMDQ][Res]resource clock engine:0x400 enable:true [ 27.] <1>.(0)[271:kworker/0:2][DISP]primary_display_init done [ 27.] <1>.(0)[271:kworker/0:2][DISP]MTK_FB_XRES=720, MTKFB_YRES=1440, MTKFB_BPP=32, MTK_FB_PAGES=3, MTKFB_LINE=2944, MTKFB_SIZEV= [ 27.] <1>.(0)[271:kworker/0:2][DISP][FB Driver] fbdev->fb_pa_base = 0x000000000f, fbdev->fb_va_base = 0x00000000e [ 27.] <1>.(0)[271:kworker/0:2][DISP]mtkfb_check_var,xres=720,yres=1440,x_virt=736,y_virt=4320,xoffset=0,yoffset=0,bits_per_pixel=32) [ 27.] <1>.(0)[271:kworker/0:2][DISP]AEE is not enabled, will disable layer 3 [ 27.] <1>.(7)[0:swapper/7][name:rtnetlink&][name:rtnetlink&][mtk_net][rtnl_lock]There is no process hold rtnl lock [ 28.] <0>.(0)[271:kworker/0:2][DISP][DT][videolfb]isvideofb_parse_done = 1 [ 28.] <0>.(0)[271:kworker/0:2][DISP][DT][videolfb]isvideofb_parse_done = 1 [ 28.] <0>.(0)[271:kworker/0:2][name:ion_drv&][ION]ion_drv_create_heap: create heap: ion_fb_heap [ 28.] <0>.(0)[271:kworker/0:2][DISP][DT][videolfb]isvideofb_parse_done = 1 [ 28.] <0>.(0)[271:kworker/0:2][name:mtkfb&]disp driver(2) mtkfb_probe end

LK驱动加载流程

platform.c流程分析

platform/mt6765/platform.c void platform_init(void) { //framebuffer的大小 g_fb_size = mt_disp_get_vram_size(); //framebuffer的起始地址 g_fb_base = mblock_reserve(&g_boot_arg->mblock_info, g_fb_size, 0x10000, 0xa0000000, RANKMAX); //mtk display系统初始化 mt_disp_init((void *)g_fb_base); //fb预先填充black mt_disp_fill_rect(0, 0, CFG_DISPLAY_WIDTH, CFG_DISPLAY_HEIGHT, 0x0); //将fb内容更新到lcm上 mt_disp_update(0, 0, CFG_DISPLAY_WIDTH, CFG_DISPLAY_HEIGHT); //初始化charge mtk_charger_init(); //初始化电池 mt65xx_bat_init(); //如果没接电池且是低电量模式，将显示低电量logo，否则正常显示logo if (kernel_charging_boot() == 1) { if ((g_boot_mode != LOW_POWER_OFF_CHARGING_BOOT) { mt_disp_show_low_battery(); } } else if (g_boot_mode != KERNEL_POWER_OFF_CHARGING_BOOT && g_boot_mode != LOW_POWER_OFF_CHARGING_BOOT) { //加载logo mboot_common_load_logo((unsigned long)mt_get_logo_db_addr_pa(), "logo"); //根据启动方式选择加载的logo，填充到fb中 mt_disp_show_boot_logo(); } //打开背光 mt65xx_backlight_on(); mt_disp_update(0, 0, CFG_DISPLAY_WIDTH, CFG_DISPLAY_HEIGHT); }

流程如下：

thread_create(“bootstrap2”…) kernel/main.c
- bootstrap2(void *arg)
  - platform_init();
    - mt_disp_init(void *lcdbase) “platform/mt6765/mt_disp_drv.c”
      - primary_display_init(char *lcm_name)
        
        pgc->plcm = disp_lcm_probe(…);“platform/mt6765/primary_display.c初始化pgc->plcm，很重要”
        
        struct LCM_DRIVER *lcm_drv = NULL;
        
        lcm_drv = lcm_driver_list[i];
        
        &st7703_hd720_dsi_vdo_lcm_drv在mk文件中定义了CUSTOM_LK_LCM=“st7703_hd720_dsi_vdo”，选择此驱动
        
        lcm_drv->get_params(&hlcm_param);
        
        plcm->lcm_if_id = plcm->params->lcm_if;lcm的接口id，分为DSI0、DSI1
        
        lcm_drv->init_power()
        
        lcm_drv->compare_id()
        
        _dump_lcm_info(plcm);打印LCM信息
        
        lcm_param = disp_lcm_get_params(pgc->plcm);
        
        plcm->params; 调用st7703中的lcm_get_params
        
        disp_lcm_init(pgc->plcm);
        
        lcm_drv->init调用st7703中的lcm_init
      - primary_display_config_input(&input);
disp_lcm_probe部分代码详解:

讯享网 lcm_drv= lcm_driver_list[i]; //驱动选择st7703 lcm_drv->get_params(&hlcm_param); //调用lcm_get_params获取参数 plcm->drv = lcm_drv; plcm->params = &hlcm_param; //赋值 plcm->lcm_if_id = plcm->params->lcm_if; //lcm的接口id，分为DSI0、DSI1、dual port DSI、DBI0、DPI0、DPI1 if (lcm_drv->init_power) { //实现上电复位初始化的动作，并通过回读0x0A寄存器判断跟lcm之前是否连接OK lcm_drv->init_power(); } if (lcm_drv->compare_id != NULL) { //读取display ID if (lcm_drv->compare_id() != 0) { isLCMFound = true; _display_interface_path_deinit(handle); dprintf(0,"we will use lcm: %s\n", lcm_drv->name); break; } }

pgc->plcm详解

结构体如下：

 24 struct disp_lcm_handle { 25 struct LCM_PARAMS *params; 26 struct LCM_DRIVER *drv; 27 enum LCM_INTERFACE_ID lcm_if_id; 28 int module; 29 int is_inited; 30 unsigned int lcm_original_width; 31 unsigned int lcm_original_height; 32 int index; 33 };

params和drv两个参数很重要，一个是从st7703中获取的显示参数，用lcm_get_params结构获取，同lcm_param，一个是驱动程序。

讯享网//LCM_DRIVER，lcm相关的一系列的操作函数 typedef struct { const char *name;　　--用于匹配lcm void (*set_util_funcs) (const LCM_UTIL_FUNCS *util); --设置lcm操作函数，gpio、reset、delay、write/read cmd void (*get_params) (LCM_PARAMS *params);　　--获取lcm的参数，接口、分辨率、porch、PLL clock、data format等 void (*init) (void);　　--lcm初始化，一般为上电复位初始化 void (*suspend) (void);　　--pm相关 void (*resume) (void); /* for power-on sequence refinement */ void (*init_power) (void);　　--上电初始化 void (*suspend_power) (void); void (*resume_power) (void); void (*update) (unsigned int x, unsigned int y, unsigned int width, unsigned int height);　　--设置ram的显示区域（x,y）->（x+width,y+height）,只在command mode下使用 unsigned int (*compare_id) (void); void (*parse_dts)(const LCM_DTS *DTS, unsigned char force_update);　　--解析设备树 /* /CABC backlight related function */ void (*set_backlight) (unsigned int level);　　--背光相关函数 void (*set_backlight_cmdq) (void *handle, unsigned int level); void (*set_pwm) (unsigned int divider); unsigned int (*get_pwm) (unsigned int divider); void (*set_backlight_mode) (unsigned int mode); /* / */ int (*adjust_fps) (void *cmdq, int fps);　　--调节刷新率，一般刷新率为60Hz /* ///ESD_RECOVERY// */ unsigned int (*esd_check) (void);　　--ESD检测相关，开启该功能，系统会周期性检测lcm寄存器状态，状态NG则会reset lcm unsigned int (*esd_recover) (void); unsigned int (*check_status) (void); unsigned int (*ata_check) (unsigned char *buffer); void (*read_fb) (unsigned char *buffer); int (*ioctl) (LCM_DRV_IOCTL_CMD cmd, unsigned int data); /* /// */ void (*enter_idle)(void); void (*exit_idle)(void); void (*change_fps)(unsigned int mode); /* //switch mode */ 　　 void *(*switch_mode) (int mode);　　--用于切换mode，command mode 和video mode切换 void (*set_cmd) (void *handle, int *mode, unsigned int cmd_num); void (*set_lcm_cmd) (void *handle, unsigned int *lcm_cmd, unsigned int *lcm_count, unsigned int *lcm_value); /* /PWM/ */ void (*set_pwm_for_mix) (int enable); } LCM_DRIVER;

//LCM_PARAMS,lcm参数设置 typedef struct { LCM_TYPE type;　　--lcm的接口类型，分为DSI、DBI、DPI LCM_CTRL ctrl; --lcm寄存器的访问方式，普遍通过MIPI LP下指令，也有的支持spi/i2c等接口访问 LCM_INTERFACE_ID lcm_if;　　--lcm的接口id，分为DSI0、DSI1、dual port DSI、DBI0、DPI0、DPI1 LCM_INTERFACE_ID lcm_cmd_if;　　--cmd模式接口，和lcm_if一致 /* common parameters */ unsigned int lcm_x;　　--（lcm_x,lcm_y）定义显示的起始pixel，（virtual_width,virtual_height）or（width，height）定义显示区域的宽和高 unsigned int lcm_y;　　 unsigned int width; unsigned int height; unsigned int virtual_width;　　 unsigned int virtual_height; unsigned int io_select_mode; /* DBI or DPI should select IO mode according to chip spec */ /* particular parameters */ LCM_DBI_PARAMS dbi;　　--DBI参数 LCM_DPI_PARAMS dpi;　　--DPI参数 LCM_DSI_PARAMS dsi;　　--DSI参数 unsigned int physical_width; unsigned int physical_height; unsigned int od_table_size; void *od_table;　　--光学相关表格，gamma节点 } LCM_PARAMS;

调试准备

用dct工具配置dws

工具位置：vendor\mediatek\proprietary\scripts\dct

在这里插入图片描述
讯享网

dws位置：vendor\mediatek\proprietary\bootable\bootloader\preloader\custom\k62v1_64\dct\dct\codegen.dws

配置完相应GPIO后进行驱动代码的移植。

添加lcm到lcm_driver_list[]数组中供遍历（kernel和lk阶段）。

(略···)

MK文件的配置（kernel和lk阶段）。

(略···)

调试lcm

LCM_setting_table调试

调试指令：

讯享网struct LCM_setting_table { unsigned char cmd; // 命令地址 unsigned char count; // 寄存器值的个数 unsigned char para_list[128]; //寄存器的值 };

lcm_initialization_setting 设置

供应商提供资料：

SSD_SEND(0x11,0xB9,0xF1,0x12,0x83); SSD_SEND(0x11,0xBA,0x33,0x81,0x05,0xF9,0x0e,0x0e,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x44,0x25,0x00,0x91,0x0a,0x00,0x00,0x02,0x4F,0x11,0x00,0x00,0x37); SSD_SEND(0x11,0xB8,0x75,0x22,0x20,0x03); SSD_SEND(0x11,0xB3,0x10,0x10,0x05,0x05,0x03,0xFF,0x00,0x00,0x00,0x00); SSD_SEND(0x11,0xC0,0x70,0x73,0x50,0x50,0x00,0x00,0x08,0x70,0x00); SSD_SEND(0x10,0xBC,0x4E); SSD_SEND(0x10,0xCC,0x0B); SSD_SEND(0x10,0xB4,0x80); SSD_SEND(0x11,0xB2,0xF0,0x12,0x30); SSD_SEND(0x11,0xE3,0x07,0x07,0x0B,0x0B,0x03,0x0B,0x00,0x00,0x00,0x00,0xFF,0x00,0xC0,0x10); SSD_SEND(0x11,0xC1,0x54,0x00,0x1E,0x1E,0x77,0xF1,0xFF,0xFF,0xCC,0xCC,0x77,0x77); SSD_SEND(0x11,0xB5,0x07,0x07); SSD_SEND(0x11,0xB6,0x30,0x30); SSD_SEND(0x11,0xBF,0x02,0x11,0x00); SSD_SEND(0x11,0xE9,0X02,0x00,0x10,0x05,0xB6,0x0A,0xA0,0x12,0x31,0x23,0x37,0x13,0x40,0xA0,0x27,0x38,0x0C,0x00,0x03,0x00,0x00,0x00,0x0C,0x00,0x03,0x00,0x00,0x00,0x75,0x75,0x31,0x88,0x88,0x88,0x88,0x88,0x88,0x13,0x88,0x64,0x64,0x20,0x88,0x88,0x88,0x88,0x88,0x88,0x02,0x88,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00); SSD_SEND(0x11,0xEA,0x02,0x21,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x46,0x02,0x88,0x88,0x88,0x88,0x88,0x88,0x64,0x88,0x13,0x57,0x13,0x88,0x88,0x88,0x88,0x88,0x88,0x75,0x88,0x23,0x10,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x0A,0xA0,0x00,0x00,0x00,0x00); SSD_SEND(0x11,0xE0,0x00,0x07,0x0F,0x30,0x35,0x3C,0x43,0x37,0x06,0x0D,0x0D,0x10,0x11,0x0F,0x12,0x0F,0x14,0x00,0x07,0x0F,0x30,0x35,0x3C,0x43,0x37,0x06,0x0D,0x0D,0x10,0x11,0x0F,0x12,0x0F,0x14); DCS_Short_Write_NP(0x11); Delay(600); DCS_Short_Write_NP(0x29); Delay(250);

代码修改如下：

讯享网static struct LCM_setting_table init_setting[] = { {REGFLAG_DELAY, 50, {0}}, {0xb9,3,{0xF1,0x12,0x83}}, {0xba,27,{0x33,0x81,0x05,0xF9,0x0E,0x0E,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x44,0x25,0x00,0x91,0x0A,0x00,0x00,0x02,0x4F,0x11,0x00,0x00,0x37}}, {0xb8,4,{0x26,0x22,0x20,0x03}}, {0xb3,10,{0x10,0x10,0x05,0x05,0x03,0xFF,0x00,0x00,0x00,0x00}}, {0xc0,9,{0x70,0x73,0x50,0x50,0x00,0x00,0x08,0x70,0x00}}, {0xbc,1,{0x4E}}, {0xcc,2,{0x0B}}, {0xb4,1,{0x80}}, {0xb2,3,{0xF0,0x12,0x30}}, {0xe3,14,{0x07,0x07,0x0B,0x0B,0x03,0x0B,0x00,0x00,0x00,0x00,0xFF,0x80,0xC0,0x10}}, {0xc1,12,{0x54,0x00,0x1E,0x1E,0x77,0xF1,0xFF,0xFF,0xCC,0xCC,0x77,0x77}}, {0xb5,2,{0x07,0x07}}, {0xb6,2,{0x30,0x30}}, {0xbf,3,{0x02,0x11,0x00}}, {0xe9,63,{0x02,0x00,0x10,0x05,0xB6,0x0A,0xA0,0x12,0x31,0x23,0x37,0x13,0x40,0xA0,0x27,0x38,0x0C,0x00,0x03,0x00,0x00,0x00,0x0C,0x00,0x03,0x00,0x00,0x00,0x75,0x75,0x31,0x88,0x88,0x88,0x88,0x88,0x88,0x13,0x88,0x64,0x64,0x20,0x88,0x88,0x88,0x88,0x88,0x88,0x02,0x88,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}}, {0xea,61,{0x02,0x21,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x46,0x02,0x88,0x88,0x88,0x88,0x88,0x88,0x64,0x88,0x13,0x57,0x13,0x88,0x88,0x88,0x88,0x88,0x88,0x75,0x88,0x23,0x10,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x0A,0xA0,0x00,0x00,0x00,0x00}}, {0xe0,34,{0x00,0x07,0x0F,0x30,0x35,0x3C,0x43,0x37,0x06,0x0D,0x0D,0x10,0x11,0x0F,0x12,0x0F,0x14,0x00,0x07,0x0F,0x30,0x35,0x3C,0x43,0x37,0x06,0x0D,0x0D,0x10,0x11,0x0F,0x12,0x0F,0x14}}, {0x11,1,{0x00}}, {REGFLAG_DELAY, 600, {0}}, {0x29,1,{0x00}}, // Display On {REGFLAG_DELAY, 250, {0}}, {REGFLAG_END_OF_TABLE, 0x00, {}} };

mipi屏的话，MTK平台的是不同的屏只要换这个lcm_initialization_setting初始化设置的代码就可以跑起来的，当然有些屏ic已经有程序，不需要再从初始化里下载这段代码。只要上电时序和配置对了就可以跑起来。

lcm_sleep_out_setting和lcm_deep_sleep_mode_in_setting设置

开屏和关屏设置。

#if 0 static struct LCM_setting_table lcm_sleep_out_setting和[] = { // Display On {0x11, 0, {0x00}}, {REGFLAG_DELAY, 120, {}}, {0x29, 0, {0x00}}, {REGFLAG_END_OF_TABLE, 0x00, {}} }; #endif static struct LCM_setting_table lcm_deep_sleep_mode_in_setting[] = { // Display Off {0x28, 0, {0x00}}, {REGFLAG_DELAY, 50, {}}, /* Sleep Mode On */ {0x10, 0, {0x00}}, { REGFLAG_DELAY, 120, {} }, { REGFLAG_END_OF_TABLE, 0x00, {} } };

分辨率设置

讯享网#define FRAME_WIDTH (720) #define FRAME_HEIGHT (1440)

display ID

LCM_ID_ST7703 (0x3821)

查阅datasheet找到ID信息如下：
在这里插入图片描述
只需要读0x04寄存器的两个字节就能确定是st7703这个屏了，读取ID的驱动程序如下：

讯享网static unsigned int lcm_compare_id(void) { unsigned int id=0; unsigned char buffer[3]; unsigned int array[16]; ... read_reg_v2(0x04, buffer, 3); id = buffer[1]|(buffer[0]<<8); //we only need ID ... if(id == LCM_ID_ST7703) return 1; } LCM_DRIVER st7703_hd720_dsi_vdo_lcm_drv ={ .compare_id = lcm_compare_id, };

DSI PLL_CLOCK设置

MIPI DSI接口PLL计算：

总数据量=（VS+VBP+VACT+VFP）（HS+HBP+HACT+HFP） fps * format_bit（format_bit根据一个pixel的数据位来定，大多为24位，RGB888）

每lane的数据量=总数据量/lane数

DSI为差分信号，一个clock内双沿采样，传输2bit数据

则最终PLL速率为每lane数据量/2

params->dsi.PLL_CLOCK = 208; 公式如下： (VS+VBP+VACT+VFP）*（HS+HBP+HACT+HFP）* fps * format_bit pll=(4+19+1440+18)*(20+20+720+20)*60*24/(4*2)=1481*780*60*24/8=207,932,400

屏幕圆缺角设置

此功能主要是设定4个边角是圆弧形的。

讯享网static void lcm_get_params(LCM_PARAMS *params) { ... #ifdef MTK_ROUND_CORNER_SUPPORT params->round_corner_params.round_corner_en = 1; params->round_corner_params.full_content = 0; params->round_corner_params.w = ROUND_CORNER_W; params->round_corner_params.h = ROUND_CORNER_H; params->round_corner_params.lt_addr = left_top; params->round_corner_params.lb_addr = left_bottom; params->round_corner_params.rt_addr = right_top; params->round_corner_params.rb_addr = right_bottom; #endif ... }

display-timming && DSI设置

DSI为4 lane，display-timming供应商提供如下：

在这里插入图片描述

 /* DSI */ /* Command mode setting */ params->dsi.LANE_NUM = LCM_FOUR_LANE; /* The following defined the fomat for data coming from LCD engine. */ params->dsi.data_format.color_order = LCM_COLOR_ORDER_RGB; params->dsi.data_format.trans_seq = LCM_DSI_TRANS_SEQ_MSB_FIRST; params->dsi.data_format.padding = LCM_DSI_PADDING_ON_LSB; params->dsi.data_format.format = LCM_DSI_FORMAT_RGB888; /* Highly depends on LCD driver capability. */ /* Not support in MT6573 */ params->dsi.packet_size = 256; params->dsi.PS = LCM_PACKED_PS_24BIT_RGB888; params->dsi.vertical_sync_active = 4; params->dsi.vertical_backporch = 19; params->dsi.vertical_frontporch = 18; params->dsi.vertical_active_line = FRAME_HEIGHT; params->dsi.horizontal_sync_active = 20; params->dsi.horizontal_backporch = 20; params->dsi.horizontal_frontporch = 20; params->dsi.horizontal_active_pixel = FRAME_WIDTH; params->dsi.PLL_CLOCK = 230; /* this value must be in MTK suggested table */

Lk调试打印

_dump_lcm_info(plcm)打印如下：

讯享网[1865] [DISP]func|disp_lcm_probe [1869] [DISPCHECK] dump lcm driver information [1874] [DISPCHECK][LCM], name: st7703_hd720_dsi_vdo [1879] [DISPCHECK][LCM] resolution: 720 x 1440 [1883] [DISPCHECK][LCM] physical size: 0 x 0 [1887] [DISPCHECK][LCM] physical size: 0 x 0 [1891] [DISPCHECK][LCM] lcm_if:0, cmd_if:0 [1895] [DISPCHECK][LCM] interface: unknown [1899] [DISPCHECK][LCM] Type: DSI [1902] [DISPCHECK][LCM] DSI Mode: SYNC_PULSE_VDO_MODE [1907] [DISPCHECK][LCM] LANE_NUM: 4,data_format:(0,2,0,0) [1913] [DISPCHECK][LCM] vact: 4, vbp: 19, vfp: 18, vact_line: 1440, hact: 20, hbp: 20, hfp: 20, hblank: 0, hactive: 720 [1923] [DISPCHECK][LCM] pll_select: 0, pll_div1: 0, pll_div2: 0, fbk_div: 0,fbk_sel: 0, rg_bir: 0 [1932] [DISPCHECK][LCM] rg_bic: 0, rg_bp: 0, PLL_CLOCK: 230, dsi_clock: 0, ssc_range: 0, ssc_disable: 0, compatibility_for_nvk: 0, cont_clock: 0 [1945] [DISPCHECK][LCM] lcm_ext_te_enable: 0, noncont_clock: 0, noncont_clock_period: 0

primary_display_init打印如下：

[2470] [DISP]func|primary_display_init [2474] [LK_DDP/ddp_manager]ddp manager init [2478] [DISPCHECK]disp_lcm_probe SUCCESS [2481] [DISP]func|disp_lcm_get_params [2485] [DISP]func|_build_path_direct_link [2489] [LK_DDP/ddp_manager]scenario primary_disp acquire mutex 0 , left mutex 0xe! [2496] [LK_DDP/ddp_manager]create handle 0x480b8710 on scenario primary_disp [2503] [DISPCHECK]dpmgr create path SUCCESS(0x480b8710) [2508] [LK_DDP/ddp_manager]set dst module on scenario primary_disp, module dsi0 [2515] [LK_DDP/ddp_path]ddp_set_dst_module, scenario=primary_disp, dst_module=dsi0 [2523] [LK_DDP/ddp_path]dsi0 is already on path [2527] [DISPCHECK]dpmgr set dst module FINISHED(dsi0) [2532] [LK_DDP/ddp_manager]path set lcm drv handle 0x480b8710 [2538] [LK_DDP/ddp_manager]dsi0 set lcm utils [2542] [DISPCHECK]primary display is DIRECT LINK MODE [2547] [DISPCHECK]primary display BUILD cmdq trigger loop finished [2553] [DISPCHECK]primary display START cmdq trigger loop finished [2559] [DISP]func|disp_lcm_is_video_mode [2562] [LK_DDP/ddp_manager]set scenario primary_disp mode Video Mode [2569] [LK_DDP/ddp_manager]path init on scenario primary_disp [2574] [LK_DDP/ddp_path]ddp path top clock on [2578] [LK_DDP/ddp_path]ddp CG0:df87ffff CG1:3ffff [2583] [LK_DDP/ddp_path]ddp path m4u off [2587] [LK_DDP/ddp_path]module ovl0 added to mutex 0 [2592] [LK_DDP/ddp_path]module ovl0_2l added to mutex 0 [2597] [LK_DDP/ddp_path]module rdma0 added to mutex 0 [2602] [LK_DDP/ddp_path]module disp_rsz0_virtual0 not added to mutex 0 [2608] [LK_DDP/ddp_path]module disp_rsz0_virtual1 not added to mutex 0 [2614] [LK_DDP/ddp_path]module pwm0 added to mutex 0 [2619] [LK_DDP/ddp_path]module dsi0 added to mutex 0 [2624] [LK_DDP/ddp_path]mutex 0 value=0x90380, sof=dsi0, eof=dsi0 [2630] [LK_DDP/ddp_path]path connect on scenario primary_disp [2635] [LK_DDP/ddp_path]connect_path: ovl0 to dsi0 [2640] [LK_DDP/ddp_path]connect mout ovl0 to ovl0_2l bits 0x2 [2646] [LK_DDP/ddp_path]connect mout ovl0_2l to rdma0 bits 0x1 [2651] [LK_DDP/ddp_path]connect out_s rdma0 to disp_rsz0_virtual0, value=0 [2658] [LK_DDP/ddp_path]connect out_s disp_rsz0_virtual1 to dsi0, value=0 [2665] [LK_DDP/ddp_path]connect in_s ovl0_2l to rdma0, value=1 [2670] [LK_DDP/ddp_path]connect in_s disp_rsz0_virtual0 to disp_rsz0_virtual1, value=0 [2678] [LK_DDP/ddp_path]connect in_s disp_rsz0_virtual1 to dsi0, value=0 [2685] [DISP]func|ddp_dsi_init [2688] [DISPCHECK]dsi0 init finished [2691] [LK_DDP/ddp_manager]path config ovl 0, rdma 0, wdma 0, dst 1 on handle 0x480b8710 scenario primary_disp [2701] [DISP]func|ddp_dsi_config [2704] [DISPCHECK][DDPDSI] DSI Mode: SYNC_PULSE_VDO_MODE [2709] [DISPCHECK][DDPDSI] LANE_NUM: 4,data_format:(0,2,0,0) [2715] [DISPCHECK][DDPDSI] vact: 4, vbp: 19, vfp: 18, vact_line: 1440, hact: 20, hbp: 20, hfp: 20, hblank: 0 [2724] [DISPCHECK][DDPDSI] pll_select: 0, pll_div1: 0, pll_div2: 0, fbk_div: 0,fbk_sel: 0, rg_bir: 0 [2733] [DISPCHECK][DDPDSI] rg_bic: 0, rg_bp: 0, PLL_CLOCK: 208, dsi_clock: 0, ssc_range: 0, ssc_disable: 1, compatibility_for_nvk: 0, cont_clock: 0 [2746] [DISPCHECK][DDPDSI] lcm_ext_te_enable: 0, noncont_clock: 0, noncont_clock_period: 0 [2755] [DISP]func|DSI_PHY_clk_setting [2762] [DISP]func|DSI_PS_Control [2765] [DISPCHECK][DISP] - LK - DSI_PHY_TIMCONFIG, pll=208, Cycle Time = 20(ns), Unit Interval = 3(ns). , lane# = 4 [2776] DISP/[DISP] - LK - DSI_PHY_TIMCONFIG, HS_TRAIL = 4, HS_ZERO = 8, HS_PRPR = 3, LPX = 4, TA_GET = 20, TA_SURE = 6, TA_GO = 16, CLK_TRAIL = 5, CLK_ZERO = 20, CLK_HS_PRPR = 3 [2791] DISP/CLK_HS_POST=36,CLK_HS_EXIT=8,CLK_TRAIL=5 [2796] DSI_PHY_TIMCONFIG, 0x0,0x0,0x0,0x00082403 [2802] [DISP]func|DSI_Config_VDO_Timing [2806] [DISP]func|disp_lcm_init [2809] [DISPCHECK]lcm init_power [2812] [DISPCHECK]lcm init [2819] [LK/LCM]st7703----tps6132----cmd=b3--i2c write success---- [2827] [LK/LCM]st7703----tps6132----cmd=b4--i2c write success---- [2834] [LK/LCM]st7703----tps6132----cmd=b1--i2c write success---- [3265] [DISP]func|DSI_dcs_read_lcm_reg_v2 [3269] [DISPCHECK]Last DSI Read Why not clear irq??? [3274] [DISPCHECK]DSI_CMDQ_SIZE : 1 [3277] [DISPCHECK]DSI_CMDQ_DATA0 : 0x00 [3281] [DISPCHECK]DSI_RX_DATA0 : 0x00000000 [3285] [DISPCHECK]DSI_RX_DATA1 : 0x00000000 [3290] [DISPCHECK]DSI_RX_DATA2 : 0x00000000 [3294] [DISPCHECK]DSI_RX_DATA3 : 0x00000000 [3298] DISP/ Start polling DSI read ready!!! [3302] DISP/ End polling DSI read ready!!! [3306] [DISPCHECK]DSI read begin i = 1 -------------------- [3311] [DISPCHECK]DSI_RX_STA : 0x00000740 [3316] [DISPCHECK]DSI_CMDQ_SIZE : 2 [3319] [DISPCHECK]DSI_CMDQ_DATA0 : 0x00013700 [3323] [DISPCHECK]DSI_CMDQ_DATA1 : 0x000a0604 [3327] [DISPCHECK]DSI_RX_DATA0 : 0x0c00011a [3332] [DISPCHECK]DSI_RX_DATA1 : 0x0051629c [3336] [DISPCHECK]DSI_RX_DATA2 : 0x00000000 [3340] [DISPCHECK]DSI_RX_DATA3 : 0x00000000 [3344] [DISPCHECK]DSI read end ---------------------------- [3350] [DISPCHECK]DSI read packet_type is 0x1a [3354] [DISPCHECK]DSI read long packet size: 1 [3358] [DISP]read from lcm 0x0A: 156 [3362] [DISP]lcm is connected [3364] [DISP]func|disp_lcm_is_video_mode [3368] [LK_DDP/ddp_manager]map event 7 to irq 0x60004 on scenario primary_disp [3375] [LK_DDP/ddp_manager]enable event on scenario primary_disp, event 7, irtbit 0x60004 [3383] [LK_DDP/ddp_manager]enable event on scenario primary_disp, event 1, irtbit 0x60004 [3394] [DISP]func|primary_display_config_input [3398] [LK_DDP/ddp_manager]path check busy on scenario primary_disp [3404] [DISP]func|ddp_dsi_is_busy [3407] [LK_DDP/ddp_manager]path config ovl 1, rdma 0, wdma 0, dst 0 on handle 0x480b8710 scenario primary_disp [3417] [LK_DDP/OVL]module 0, layer=1, en=1, src=0, fmt=, addr=0x7f4eb000, x=0, y=0, pitch=2880, dst(0, 0, 720, 1440),keyEn=0, key=0, aen=1, alpha=255 [3431] [LK_DDP/OVL]ovl0, layer=1, source=memory, off(x=0, y=0), dst(0, 0, 720, 1440),pitch=2880,fmt=eBGRA8888, addr=7f4eb000, keyEn=0, key=0, aen=1, alpha=255 [3445] [DISP]func|ddp_dsi_config [3448] [DISP]func|primary_display_config_input [3453] [LK_DDP/ddp_manager]path check busy on scenario primary_disp [3459] [DISP]func|ddp_dsi_is_busy [3462] [LK_DDP/ddp_manager]path config ovl 1, rdma 0, wdma 0, dst 0 on handle 0x480b8710 scenario primary_disp [3472] [LK_DDP/OVL]module 0, layer=0, en=1, src=0, fmt=, addr=0x7f0e0000, x=0, y=0, pitch=2944, dst(0, 0, 720, 1440),keyEn=0, key=0, aen=1, alpha=255 [3486] [LK_DDP/OVL]ovl0, layer=0, source=memory, off(x=0, y=0), dst(0, 0, 720, 1440),pitch=2944,fmt=eBGRA8888, addr=7f0e0000, keyEn=0, key=0, aen=1, alpha=255 [3500] [LK_DDP/OVL]module 0, layer=1, en=1, src=0, fmt=, addr=0x7f4eb000, x=0, y=0, pitch=2880, dst(0, 0, 720, 1440),keyEn=0, key=0, aen=1, alpha=255 [3514] [LK_DDP/OVL]ovl0, layer=1, source=memory, off(x=0, y=0), dst(0, 0, 720, 1440),pitch=2880,fmt=eBGRA8888, addr=7f4eb000, keyEn=0, key=0, aen=1, alpha=255 [3528] [DISP]func|ddp_dsi_config [3531] [DISP]mt_disp_init() done