Android开发板

Android开发板主要有Qualcomm, MTK, HiSilicon, Samsung SOC平台.

96boards开发板

详情请见:

• https://www.96boards.org/products/ce/
• https://www.alpha-star.org/hikey960
• https://www.alpha-star.org/mediatek-x20-development-board

Intrinsyc开发板

详情请见:

https://www.intrinsyc.com/snapdragon-embedded-development-kits/snapdragon-820-development-kit/

FriendlyARM友善之臂开发板

详情请见：

http://www.arm9.net/tiny4412.asp

主要文件路径

Android LCD点亮

开机: LK点亮 LCD

• 如果失败, Kernel点亮LCD
• 成功，则直到下一次灭屏

开机后灭亮屏: Kernel点亮

LCD手动亮灭屏

1.Qualcomm手动亮灭屏

mdss_fb.c:

void mdss_fb_my_blank(void){    struct fb_info *fbi = fbi_list[0];    pr_info("[FB]%s called\n", __func__);    mdss_fb_blank_sub(FB_BLANK_POWERDOWN, fbi, 1);}void mdss_fb_my_unblank(void) {    struct fb_info *fbi = fbi_list[0];    pr_info("[FB]%s called\n", __func__);    mdss_fb_blank_sub(FB_BLANK_UNBLANK, fbi, 1);}

mdss_dsi_panel.c:

void mdss_fb_my_blank(void);void mdss_fb_my_unblank(void);int mdss_dsi_panel_my_init_(void *dir){    mdelay(1000);    while (1) {        if (!mdss_fb_panel_registered(0)) {            mdelay(500);            continue;        }        mdss_fb_my_blank();        mdelay(100);        mdss_fb_my_unblank();        return 0;    }    return 0;}void mdss_dsi_panel_my_init(void){    struct task_struct *thread = NULL;    thread = kthread_run(mdss_dsi_panel_my_init_, (void*)NULL, "my_init");    if (IS_ERR(thread)) {        pr_err("failed to create thread for my_init init\n");        return;    }    }

mdss_mdp_intf_video.c

void mdss_dsi_panel_my_init(void);int mdss_mdp_video_reconfigure_splash_done(struct mdss_mdp_ctl *ctl,    bool handoff){    //...    mdss_dsi_panel_my_init();}

2. MTK开机kernel点屏

disp_lcm.c:

int disp_lcm_init(disp_lcm_handle *plcm, int force){    LCM_DRIVER *lcm_drv = NULL;    DISPFUNC();    if (_is_lcm_inited(plcm)) {        lcm_drv = plcm->drv;        if (lcm_drv->init_power) {            if (!disp_lcm_is_inited(plcm) || force) {                pr_debug("lcm init power()\n");                lcm_drv->init_power();            }        }        if (lcm_drv->init) {            if (!disp_lcm_is_inited(plcm) || force) {                pr_debug("lcm init()\n");                lcm_drv->init();            }        } else {            DISPERR("FATAL ERROR, lcm_drv->init is null\n");            return -1;        }    }    //...}

lk LCM驱动 lcm_driver.c

LCM_DRIVER my_lcm_drv = {    //.init = lcm_init,    //.init_power = lcm_init_power,};

kernel primary_display.c:

force: 0 -> 1

int primary_display_init(char *lcm_name, unsigned int lcm_fps, int is_lcm_inited){    // ...    if (is_lcm_inited) {        ret = disp_lcm_init(pgc->plcm, /*0*/1); /* no need lcm power on,because lk power on lcm */    } else {        ret = disp_lcm_init(pgc->plcm, 1);        if (primary_display_is_video_mode())            dpmgr_path_trigger(pgc->dpmgr_handle, NULL, 0);    }    // ...}

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