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高通 msm8953 LCD 休眠/唤醒 流程
2022-08-10 09:36:00 【沉沦者】
一、 LK进recovey阶段：
涉及相关文件：
fbdev/core/fbmem.c
fbdev/msm/mdss_fb.c
drivers/video/fbdev/msm/mdss_dsi.c
drivers/video/fbdev/msm/mdss_dsi_panel.c
drivers/leds/led-class.c
流程：主要是通过dev/fb节点的ioctl方法来实现控制：开启显示线程，复位、初始化、打开背光等操作。
fb_ioctl->do_fb_ioctl->Fb_blank->info->fbops->fb_blank=mdss_fb_blank ->
mdss_fb_blank->mdss_fb_blank_sub ->
进入recovery/ota升级时的流程：
亮屏：
mdss_fb_blank_unblank
->mdss_fb_start_disp_thread
->mfd->mdp.on_fnc(mfd)=mdss_mdp_overlay_on
->__mdss_mdp_overlay_ctl_init
->mdss_mdp_ctl_intf_event(mdp5_data->ctl, MDSS_EVENT_RESET, NULL, false)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_mdp_overlay_start
->mdss_mdp_clk_ctrl
->mdss_mdp_ctl_start
->mdss_dsi_event_handler(MDSS_EVENT_REGISTER_RECOVERY_HANDLER)
->mdss_mdp_hist_intr_setup
->mdss_mdp_overlay_kickoff
->mdss_mdp_display_commit
->ctl->ops.display_fnc=mdss_mdp_video_display
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_LINK_READY, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_dsi_on
->mdss_dsi_panel_power_ctrl
->mdss_dsi_panel_power_on
->mdss_dsi_pinctrl_set_state
->mdss_dsi_panel_reset
->mdss_dsi_phy_init
->mdss_dsi_phy_init_sub
->mdss_dsi_pinctrl_set_state
->mdss_dsi_panel_reset
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_UNBLANK, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_dsi_unblank
->mdss_dsi_clk_ctrl
->ctrl_pdata->on=mdss_dsi_panel_on
->mdss_bdg_video_on
->bdg_data->ops.video_on
->mdss_dsi_panel_cmds_send
->mdss_dsi_panel_on_hdmi
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_PANEL_ON, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_POST_PANEL_ON, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_mdp_ctl_setup
->mdss_fb_set_backlight
->mdss_fb_scale_bl
->pdata->set_backlight(pdata, temp)=mdss_dsi_panel_bl_ctrl
->mdss_dsi_panel_bklt_pwm主要是涉及关闭显示线程，下发off指令，释放硬件资源，关闭背光等。
灭屏：
mdss_fb_blank_blank
->mdss_fb_stop_disp_thread
->mdss_fb_set_backlight
->(*mfd->mdp.ad_calc_bl)(mfd, temp, &temp, &ad_bl_notify_needed) = pp_ad_calc_bl
->mdss_fb_scale_bl
->pdata->set_backlight(pdata, temp)=mdss_dsi_panel_bl_ctrl //背光控制
->mfd->mdp.off_fnc(mfd)=mdss_mdp_overlay_off
->mdss_mdp_overlay_kickoff
->mdss_mdp_overlay_start
->mdss_mdp_ctl_start
->mdss_mdp_hist_intr_setup(&mdata->hist_intr, MDSS_IRQ_RESUME)
->mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF)
->mdss_mdp_display_commit
->ctl->ops.display_fnc(ctl, arg)=mdss_mdp_video_display
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_LINK_READY, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler=mdss_dsi_event_handler
->mdss_dsi_on
->mdss_dsi_panel_power_ctrl(pdata, MDSS_PANEL_POWER_ON)
->mdss_dsi_set_clk_src
->mdss_dsi_pinctrl_set_state
->mdss_dsi_panel_reset
->mdss_dsi_op_mode_config
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_UNBLANK, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler=mdss_dsi_event_handler
->mdss_dsi_unblank
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_PANEL_ON, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler=mdss_dsi_event_handler
->mdss_dsi_unblank
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_POST_PANEL_ON, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler=mdss_dsi_event_handler
->mdss_dsi_post_panel_on
->mdss_mdp_ctl_stop
->ctl->ops.stop_fnc(ctl, power_state)=mdss_mdp_video_ctx_stop
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_BLANK, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg) =mdss_dsi_event_handler
->mdss_dsi_blank
->ctrl_pdata->off(pdata)=mdss_dsi_panel_off
->mdss_bdg_video_on
->bdg_data->ops.video_on(on)=lt8911exb_video_on //桥接ic
->mdss_dsi_panel_cmds_send
->mdss_dsi_panel_off_hdmi
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_PANEL_OFF, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_dsi_blank
->mdss_dsi_off
->mdss_dsi_controller_cfg
->mdss_dsi_phy_disable
->mdss_dsi_panel_power_ctrl
->mdss_dsi_panel_power_off
->mdss_dsi_panel_reset
->mdss_mdp_ctl_write(ctl, MDSS_MDP_REG_CTL_TOP, 0)
->mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF);
->mdss_mdp_ctl_destroy二、kernel部分LCD唤醒休眠流程
主要是开启显示线程，复位，、硬件初始化、控制背光等操作。
唤醒：
fb_ioctl
->do_fb_ioctl
->fb_blank
->mdss_fb_blank
->mdss_fb_blank_sub
->mdss_fb_blank_unblank
->mdss_fb_start_disp_thread
->mfd->mdp.on_fnc=mdss_mdp_overlay_on
->mdss_mdp_ctl_intf_event(mdp5_data->ctl, MDSS_EVENT_RESET, NULL, false)
->mdss_mdp_overlay_start
->mdss_mdp_ctl_start
->mdss_mdp_ctl_start_sub
->mdss_mdp_hist_intr_setup
->mdss_mdp_ctl_split_display_enable
->mdss_mdp_hist_intr_setup
->mdss_mdp_ctl_notifier_register
->mdss_mdp_pp_resume
->mdss_mdp_splash_cleanup
->mdss_mdp_overlay_kickoff
->mdss_mdp_display_commit
->ctl->ops.display_fnc(ctl, arg)=mdss_mdp_video_display
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_LINK_READY, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_dsi_on
->mdss_dsi_panel_power_ctrl
->mdss_dsi_panel_power_on
->mdss_dsi_pinctrl_set_state
->mdss_dsi_panel_reset
->mdss_dsi_clk_ctrl
->mdss_dsi_phy_init
->mdss_dsi_pinctrl_set_state
->mdss_dsi_panel_reset
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_UNBLANK, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->mdss_dsi_unblank
->ctrl_pdata->on(pdata)=mdss_dsi_panel_on
->mdss_bdg_video_on
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_PANEL_ON, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_POST_PANEL_ON, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->mdss_fb_set_backlight
->pdata->set_backlight(pdata, temp)=mdss_dsi_panel_bl_ctrl
->mdss_dsi_panel_bklt_pwm主要是先通过lcd-backlight节点的brightness_set方法关闭背光，再通过dev/fb节点的ioctl方法来停止显示线程，释放硬件资源。
休眠：
brightness_set=mdss_fb_set_bl_brightness
->mdss_fb_set_backlight
->pdata->set_backlight(pdata, temp)=mdss_dsi_panel_bl_ctrl
->mdss_dsi_panel_bklt_pwm
fb_ioctl
->do_fb_ioctl
->fb_blank
->mdss_fb_blank
->mdss_fb_blank_sub
->mdss_fb_blank_blank
->mdss_fb_stop_disp_thread
->mdss_fb_set_backlight
->pdata->set_backlight(pdata, temp)=mdss_dsi_panel_bl_ctrl
->mfd->mdp.off_fnc=mdss_mdp_overlay_off
->mdss_mdp_ctl_stop
->mdss_mdp_hist_intr_setup
->ctl->ops.stop_fnc(ctl, power_state)=mdss_mdp_video_ctx_stop
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_BLANK, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_dsi_blank
->ctrl_pdata->off(pdata)
->mdss_dsi_panel_off
->mdss_bdg_video_on
->mdss_dsi_panel_cmds_send
->mdss_dsi_panel_off_hdmi
->mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_PANEL_OFF, NULL, CTL_INTF_EVENT_FLAG_DEFAULT)
->pdata->event_handler(pdata, event, arg)=mdss_dsi_event_handler
->mdss_dsi_off
->mdss_dsi_clk_ctrl
->mdss_dsi_controller_cfg
->mdss_dsi_phy_disable
->mdss_dsi_panel_power_ctrl
->mdss_dsi_panel_power_off
->mdss_dsi_panel_reset
->mdss_dsi_pinctrl_set_state
->mdss_mdp_ctl_write(ctl, MDSS_MDP_REG_CTL_TOP, 0)
->mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF)三、LCD lk阶段的流程
主要是通过桥接ic和panel id来决定初始化的panelstruct面板的数据，再对实际面板的进行初始化流程。
涉及的文件：
Target/msm8953/oem_panel.c
Dev/gcdb/display/gcdb_display.c
Target/msm8953/target_display.c
Platform/msm_shared/display.c
Platform/msm_shared/mipi_dsi.c
LK部分LCD流程
target_display_init
->gcdb_display_init
->target_panel_enable
->oem_panel_select
->init_panel_data
->set_panel_cmd_string("sec:dsi_hbs_sc7705_800p_dsi1_video")
->dsi_panel_init
->msm_display_init
->pdata->power_func(1, &(panel->panel_info))=mdss_dsi_panel_power
->pdata->dfps_func(&(panel->panel_info))=mdss_dsi_mipi_dfps_config
->pdata->clk_func(1, &(panel->panel_info))
->pdata->update_panel_info()
->pdata->pll_clk_func(1, &(panel->panel_info))
->msm_fb_alloc
->display_image_on_screen
->msm_display_config
->mdss_dsi_config
->mdss_dsi_phy_init
->mdss_dsi_host_init
->panel->pre_init_func
->mdss_dsi_panel_initialize
->get_panel_rdid
->pinfo->rotate()
->pinfo->early_config((void *)pinfo)
->mdp_dsi_video_config
->msm_display_on
->mdp_dsi_video_on
->mdss_dsi_post_on
->mipi_dsi_on
->pdata->post_power_func(1)
->panel.bl_func=mdss_dsi_bl_enable
->panel_backlight_ctrl边栏推荐
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