linux qcom LCD framwork

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0.关键字

MDSS : Multimedia Display sub system 
DSI: Display Serial Interface

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1.涉及文件

（1） drivers\video\fbmem.c （核心层）

  register_framebuffer(struct fb_info *fb_info)   //对外暴露核心函数
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（2）drivers\video\msm\mdss\mdss_fb.c (mdss 核心层 fbx平台设备驱动)

// 调用 fbmem.c的 register_framebuffer注册 fbx
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（3）drivers\video\msm\mdss\dsi_host_v2.c （lcd驱动 dsi）

// 通过下面函数向 mdss_fb.c 注册了fb_info结构  (包含在mdss_dsi_ctrl_pdata结构中)dsi_panel_device_register_v2(struct platform_device *dev,struct mdss_dsi_ctrl_pdata *ctrl_pdata)static const struct of_device_id msm_dsi_v2_dt_match[] = {    {.compatible = "qcom,msm-dsi-v2"},    {}};
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（4）msm8610-mdss.dtsi （文件名通常为 msmxxx-mdss.dtsi 指定了mdss 的 mdp 和 dsi）

  mdss_mdp: qcom,mdss_mdp@fd900000 {            compatible = "qcom,mdss_mdp3";----------  mdss_dsi0: qcom,mdss_dsi@fdd00000 {        compatible = "qcom,msm-dsi-v2";
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（5）drivers\video\msm\mdss\mdp3.c （mdp）

   .compatible = "qcom,mdss_mdp3",
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（6）msm8610-asus.dts （指定mdp中的哪一个配置） 
通常在dts文件的 mdss_dsi0 lab里面通过 qcom,dsi-pref-prim-pan 属性 指定使用哪一个lcd配置

&mdss_dsi0 {        qcom,dsi-pref-prim-pan = <&dsi_fl10802_fwvga_vid>;};
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（7）dsi-panel-fl10802-fwvga-video.dtsi

&mdss_mdp {    dsi_fl10802_fwvga_vid: qcom,mdss_dsi_fl10802_fwvga_video {        qcom,mdss-dsi-panel-name = "fl10802 fwvga video mode dsi panel";        qcom,mdss-dsi-drive-ic = "fl10802";        qcom,mdss-dsi-panel-controller = <&mdss_dsi0>;        qcom,mdss-dsi-panel-type = "dsi_video_mode";        qcom,mdss-dsi-panel-destination = "display_1";        ...        }
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2. mdss_mdp 和 mdss_dsi0 的关系

mdss_mdp 相当于一个数组，里面定义了很多不同lcd显示屏的配置项包括分辨率等等

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mdss_dsi0 的 “qcom,dsi-pref-prim-pan ” 属性指定了使用mdss_mdp中哪一个lcd配置选项 

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3.时序图

画的有点渣，凑活看吧，不要在意细节  

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4. 重要结构

backLight关键字：qcom,mdss-dsi-bl-pmic-control-type
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// mdss_dsi_ctrl_pdata->panel_data.panel_info    = struct mdss_panel_infostruct mdss_dsi_ctrl_pdata {    int ndx;    /* panel_num */    int (*on) (struct mdss_panel_data *pdata);                              // ★ on    int (*off) (struct mdss_panel_data *pdata);                             // ★ off    int (*partial_update_fnc) (struct mdss_panel_data *pdata);    int (*check_status) (struct mdss_dsi_ctrl_pdata *pdata);    int (*cmdlist_commit)(struct mdss_dsi_ctrl_pdata *ctrl, int from_mdp);    void (*switch_mode) (struct mdss_panel_data *pdata, int mode);    struct mdss_panel_data panel_data;                          //★ panel_data->set_backlight   设置背光亮度函数    unsigned char *ctrl_base;    struct dss_io_data ctrl_io;    struct dss_io_data mmss_misc_io;    struct dss_io_data phy_io;    int reg_size;    u32 bus_clk_cnt;    u32 link_clk_cnt;    u32 flags;    struct clk *mdp_core_clk;    struct clk *ahb_clk;    struct clk *axi_clk;    struct clk *mmss_misc_ahb_clk;    struct clk *byte_clk;    struct clk *esc_clk;    struct clk *pixel_clk;    u8 ctrl_state;    int panel_mode;     int irq_cnt;    int rst_gpio;                   // ★ gpio  qcom,platform-reset-gpio:        Specifies the panel reset gpio.    int disp_en_gpio;               // qcom,platform-enable-gpio:               Specifies the panel lcd/display enable gpio.    int disp_te_gpio;               // qcom,platform-te-gpio:                   Specifies the gpio used for TE.    int mode_gpio;                  // qcom,platform-mode-gpio:             Select video/command mode of panel through gpio when it supports both modes.    int disp_te_gpio_requested;    int bklt_ctrl;                  /* backlight ctrl 背光类型*/       int pwm_period;    int pwm_pmic_gpio;    int pwm_lpg_chan;    int bklt_max;    int new_fps;    int pwm_enabled;    bool dmap_iommu_map;    struct pwm_device *pwm_bl;    struct dsi_drv_cm_data shared_pdata;    u32 pclk_rate;    u32 byte_clk_rate;    struct dss_module_power power_data;     // ★ clock & regulator    u32 dsi_irq_mask;    struct mdss_hw *dsi_hw;    struct mdss_panel_recovery *recovery;    struct dsi_panel_cmds on_cmds;          // light on cmd  ★    qcom,mdss-dsi-on-command    struct dsi_panel_cmds off_cmds;         // off cmd      ★    qcom,mdss-dsi-off-command    struct dsi_panel_cmds status_cmds;    u32 status_value;    struct dsi_panel_cmds video2cmd;    struct dsi_panel_cmds cmd2video;    struct dcs_cmd_list cmdlist;    struct completion dma_comp;    struct completion mdp_comp;    struct completion video_comp;    struct completion bta_comp;    spinlock_t irq_lock;    spinlock_t mdp_lock;    int mdp_busy;    struct mutex mutex;    struct mutex cmd_mutex;    bool ulps;    struct dsi_buf tx_buf;    struct dsi_buf rx_buf;    struct dsi_buf status_buf;    int status_mode;};
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struct mdss_panel_info {    u32 xres;                   // x 分辨率     qcom,mdss-dsi-panel-width    u32 yres;                   // y 分辨率        qcom,mdss-dsi-panel-height    u32 physical_width;         // x 物理大小   qcom,mdss-pan-physical-width-dimension    u32 physical_height;        // y 物理大小   qcom,mdss-pan-physical-height-dimension    struct lcd_panel_info lcdc; // 边界       （1）边界    u32 bpp;                    // bpp          qcom,mdss-dsi-bpp    struct mipi_panel_info mipi; // mipi显示模式 video or cmd  （2）mipi    u32 type;    u32 wait_cycle;    u32 pdest;                 // 第几个fb设备  qcom,mdss-dsi-panel-destination = "display_1";    u32 brightness_max;    u32 bl_max;    u32 bl_min;    u32 fb_num;    u32 clk_rate;    u32 clk_min;    u32 clk_max;    u32 frame_count;    u32 is_3d_panel;    u32 out_format;    u32 rst_seq[MDSS_DSI_RST_SEQ_LEN];    ...    }
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（1）边界   struct lcd_panel_info {    u32 h_back_porch;    u32 h_front_porch;    u32 h_pulse_width;    u32 v_back_porch;    u32 v_front_porch;    u32 v_pulse_width;    u32 border_clr;    u32 underflow_clr;    u32 hsync_skew;    /* Pad width */    u32 xres_pad;       // qcom,mdss-dsi-h-left-border    /* Pad height */    u32 yres_pad;       // qcom,mdss-dsi-h-right-border};（2）mipi struct mipi_panel_info {    char mode;      /* video/cmd */   // 显示模式   qcom,mdss-dsi-panel-type = "dsi_video_mode";    char interleave_mode;    char crc_check;    char ecc_check;    char dst_format;    /* shared by video and command */    char data_lane0;    char data_lane1;    char data_lane2;    char data_lane3;    char dlane_swap;    /* data lane swap */    char rgb_swap;    char b_sel;    char g_sel;    char r_sel;    char rx_eot_ignore;    char tx_eot_append;    char t_clk_post; /* 0xc0, DSI_CLKOUT_TIMING_CTRL */    char t_clk_pre;  /* 0xc0, DSI_CLKOUT_TIMING_CTRL */    char vc;    /* virtual channel */    struct mdss_dsi_phy_ctrl dsi_phy_db;    /* video mode */    char pulse_mode_hsa_he;    char hfp_power_stop;    char hbp_power_stop;    char hsa_power_stop;    char eof_bllp_power_stop;    char last_line_interleave_en;    char bllp_power_stop;    char traffic_mode;    char frame_rate;    /* command mode */    char interleave_max;    char insert_dcs_cmd;    char wr_mem_continue;    char wr_mem_start;    char te_sel;    char stream;    /* 0 or 1 */    char mdp_trigger;    char dma_trigger;    /*Dynamic Switch Support*/    bool dynamic_switch_enabled;    u32 pixel_packing;    u32 dsi_pclk_rate;    /* The packet-size should not bet changed */    char no_max_pkt_size;    /* Clock required during LP commands */    char force_clk_lane_hs;    char vsync_enable;    char hw_vsync_mode;    char lp11_init;    u32  init_delay;};
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