开发板部分总结

Android开发板

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

96boards开发板

开发板	DragonBoard 410C	Mediatek X20	Hikey 960
SOC平台	Snapdragon 410C, MSM8916	Helio X20, MT6797	Hisi Kirin 960
Kernel	Linux 3.18	Linux 3.18	Linux 4.4
Android	Lollipop/Marshmallow	Marshmallow	Oreo

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

开发板	Open Q820 Development Kit
SOC	Snapdragon 820, MSM8996, APQ8096
Kernel	Linux 3.18
Android	Oreo

详情请见:

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

FriendlyARM友善之臂开发板

开发板	Tiny4412
SOC	Samsung Exynos 4412
Kernel	Linux 3.0
Android	Lollipop

详情请见：

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

主要文件路径

开发板	Dragonboard 410C
LK	bootable\bootloader\lk\target\msm8916
DSI	kernel\drivers\video\msm\mdss
DTS	kernel\arch\arm64\boot\dts\qcom\apq8016-sbc.dtsi
TP	kernel\drivers\input\touchscreen

开发板	Mediatek X20
LK	vendor\mediatek\proprietary\bootable\bootloader\lk\dev\lcm vendor\mediatek\proprietary\bootable\bootloader\lk\project\amt6797_64_open.mk
LCM	kernel-3.18\drivers\misc\mediatek\lcm kernel-3.18\drivers\misc\mediatek\video\mt6797
DTS	kernel-3.18\arch\arm64\boot\dts\amt6797_64_open.dts kernel-3.18\drivers\misc\mediatek\dws\mt6797\amt6797_64_open.dws
TP	kernel-3.18\drivers\input\touchscreen\mediatek

开发板	Open Q820 Development Kit
LK	LOCKED!
DSI	kernel\msm-3.18\drivers\video\msm\mdss
DTS	kernel\msm-3.18\arch\arm64\boot\dts\qcom\apq8096-dragonboard.dtsi
TP	kernel\msm-3.18\drivers\input\touchscreen

开发板	Hikey 960
DTS	hikey-linaro\arch\arm64\boot\dts\hisilicon\hi3660.dtsi
TP	hikey-linaro\drivers\input\touchscreen

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);
    }
    // ...
}