Android開發板

Android開發板主要有Qualcomm, MTK, HiSilicon, Samsung SOC平臺.

96boards開發板

詳情請見:

Intrinsyc開發板

詳情請見:

FriendlyARM友善之臂開發板

詳情請見：

主要檔案路徑

Android LCD點亮

開機: LK點亮 LCD

• 如果失敗, Kernel點亮LCD
• 成功，則直到下一次滅屏

開機後滅亮屏: Kernel點亮

LCD手動亮滅屏

1.Qualcomm手動亮滅屏

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開機kernel點屏

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驅動 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);
    }
    // ...
}