qcom 亮灭屏代码分析

来源：互联网发布：数组中删除指定元素编辑：程序博客网时间：2024/06/06 02:20

0. fb0以及背光注册流程

// mdss_fb.cmdss_fb_probe// fbi 结构赋值         mdss_fb_register(struct msm_fb_data_type *mfd)                struct fb_info *fbi = mfd->fbi;                     .....                   fix = &fbi->fix;            var = &fbi->var;                fbi->fbops = &mdss_fb_ops;  //ops                        static struct fb_ops mdss_fb_ops = {                                         ...                                        .fb_blank = mdss_fb_blank,  /* blank display */                                     ...                                 };                            mdss_fb_blank                                        mdss_fb_blank_sub                                                case FB_BLANK_UNBLANK:                                                 mdss_fb_blank_unblank(mfd);                            //light up                                                     break;                                                            case FB_BLANK_HSYNC_SUSPEND:                                                case FB_BLANK_POWERDOWN:                                                     mdss_fb_blank_blank(mfd, req_power_state);  // light off                                                     break;     // 注册 backlight  sys节点及set函数实现          led_classdev_register(&pdev->dev, &backlight_led)                          static struct led_classdev backlight_led = {                    .name           = "lcd-backlight",                    .brightness     = MDSS_MAX_BL_BRIGHTNESS / 2,                    .brightness_set = mdss_fb_set_bl_brightness,    // 背光set函数                    .max_brightness = MDSS_MAX_BL_BRIGHTNESS,                       };// register fbx            register_framebuffer(struct fb_info *fb_info)  // fbmem.c

1.mdss_fb_blank_blank & unblank

// (drivers\video\msm\mdss\mdss_fb.c)/* 亮灭lcm代码追踪 */mdss_fb_blank_blank        mdss_fb_set_backlight    // <1> 背光        mfd->mdp.off_fnc(mfd);    // <2> 显示   mdss_fb_blank_unblank        ret = mfd->mdp.on_fnc(mfd);        mdss_fb_set_backlight

<1> 背光

// mdss_fb_set_backlight 函数追踪mdss_fb_set_backlight    // mdss_fb.c    mdss_panel_data->set_backlight----------// (drivers\video\msm\mdss\mdss_dsi_panel.c)    ctrl_pdata->panel_data.set_backlight = mdss_dsi_panel_bl_ctrl;        case BL_WLED:                printk("zch===============set blk type = BL_WLED\n");        led_trigger_event(bl_led_trigger, bl_level);        break;    case BL_PWM:                 printk("zch===============set blk type = BL_PWM\n");        mdss_dsi_panel_bklt_pwm(ctrl_pdata, bl_level);        break;

note: 背光的控制方式由 dsi中的 qcom,mdss-dsi-bl-pmic-control-type 属性值控制！

qcom,mdss-dsi-bl-pmic-control-type = "bl_ctrl_wled" ， “bl_ctrl_pwm”;

<2> 显示

// (drivers\video\msm\mdss\mdp3_ctrl.c)   mdp3_interface->on_fnc  mdp3_interface->off_fnc   event_handlermdp3_interface->on_fnc =mdp3_ctrl_on              mdp3_clk_enable(1, 0);        rc = panel->event_handler(panel,                MDSS_EVENT_LINK_READY, NULL);    // 开电 ①        rc |= panel->event_handler(panel,                MDSS_EVENT_UNBLANK, NULL);       // 执行亮屏指令 ②        rc |= panel->event_handler(panel,                MDSS_EVENT_PANEL_ON, NULL);            mdp3_clk_enable(0, 0);mdp3_interface->off_fnc = mdp3_ctrl_off;        rc = panel->event_handler(panel, MDSS_EVENT_BLANK,      // 执行灭屏指令 ②            (void *) (long int)mfd->panel_power_state);        rc = panel->event_handler(panel, MDSS_EVENT_PANEL_OFF,  // 关电 ①            (void *) (long int)mfd->panel_power_state);

① 开关panel电源

// mdss_dsi.c   event_handler   MDSS_EVENT_LINK_READY|MDSS_EVENT_PANEL_OFFdsi_panel_device_register    ctrl_pdata->panel_data.event_handler = mdss_dsi_event_handler;mdss_dsi_event_handlerMDSS_EVENT_LINK_READY|MDSS_EVENT_PANEL_OFF    mdss_dsi_on | mdss_dsi_off            mdss_dsi_panel_power_ctrl(struct mdss_panel_data * pdata, int power_state)(struct mdss_panel_data *pdata,int power_state)                    case MDSS_PANEL_POWER_OFF:                    mdss_dsi_panel_power_off(pdata);   // ☆                    case MDSS_PANEL_POWER_ON:                     mdss_dsi_panel_power_on(pdata);   // ☆

② 开关panel

/*  MDSS_EVENT_UNBLANK | MDSS_EVENT_BLANK (drivers\video\msm\mdss\mdss_dsi.c)*/mdss_dsi_event_handler        case MDSS_EVENT_UNBLANK:        if (ctrl_pdata->on_cmds.link_state == DSI_LP_MODE)            rc = mdss_dsi_unblank(pdata);   // ☆        break;    case MDSS_EVENT_PANEL_ON:        ctrl_pdata->ctrl_state |= CTRL_STATE_MDP_ACTIVE;        if (ctrl_pdata->on_cmds.link_state == DSI_HS_MODE)            rc = mdss_dsi_unblank(pdata);        pdata->panel_info.esd_rdy = true;        break;    case MDSS_EVENT_BLANK:        if (ctrl_pdata->off_cmds.link_state == DSI_HS_MODE)            rc = mdss_dsi_blank(pdata, power_state); // ☆        break;    case MDSS_EVENT_PANEL_OFF:        ctrl_pdata->ctrl_state &= ~CTRL_STATE_MDP_ACTIVE;        if (ctrl_pdata->off_cmds.link_state == DSI_LP_MODE)            rc = mdss_dsi_blank(pdata, power_state);        rc = mdss_dsi_off(pdata, power_state);        break;----------// mdss_dsi_unblank |mdss_dsi_blank 函数追踪mdss_dsi_unblank         ATRACE_BEGIN("dsi_panel_on");        mdss_dsi_ctrl_pdata  ctrl_pdata->on(pdata);         ATRACE_END("dsi_panel_on");mdss_dsi_blank       ATRACE_BEGIN("dsi_panel_off");       mdss_dsi_ctrl_pdata  ctrl_pdata->off(pdata);       ATRACE_END("dsi_panel_off");----------// 解析lcm dts ，开关panel 回调函数赋值 (drivers\video\msm\mdss\Mdss_dsi_panel.c) /* 0.解析lcm的dtsi，开关屏函数赋值 */mdss_dsi_panel_init      mdss_dsi_ctrl_pdata  ctrl_pdata->on = mdss_dsi_panel_on;      mdss_dsi_ctrl_pdata  ctrl_pdata->off = mdss_dsi_panel_off;/* 1. 解析 on/off cmd data */mdss_dsi_parse_dcs_cmds(np, &pt->on_cmds,        "qcom,mdss-dsi-on-command","qcom,mdss-dsi-on-command-state");mdss_dsi_parse_dcs_cmds(np, &ctrl_pdata->off_cmds,        "qcom,mdss-dsi-off-command", "qcom,mdss-dsi-off-command-state");/* 2. 执行开关屏命令参数函数 */ mdss_dsi_panel_on    mdss_dsi_panel_cmds_send(ctrl, on_cmds, CMD_REQ_COMMIT);mdss_dsi_panel_off        mdss_dsi_panel_cmds_send(ctrl, &ctrl->off_cmds, CMD_REQ_COMMIT);

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