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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/display/display_init_process.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">初始化流程</h1><div class="date inPage">28 Nov 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="display_initialization_process__section_y1b_11g_d1c" data-ofbid="display_initialization_process__section_y1b_11g_d1c"><h2 class="- topic/title title sectiontitle">Probe 和 Bind 过程</h2>
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<p class="- topic/p p" data-ofbid="d73372e28__20250121171523">为了约束初始化顺序，AICFB 为 component 的 master 设备，DE、DI 和 panel 为 slave 设备，component 框架保证
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master 的初始化顺序在所有 slave 之后。各模块的初始化顺序如下：</p>
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<div class="- topic/p p" data-ofbid="d73372e31__20250121171523">
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<figure class="- topic/fig fig fignone" id="display_initialization_process__fig_uh2_b1g_d1c" data-ofbid="display_initialization_process__fig_uh2_b1g_d1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="display_initialization_process__image_z1b_11g_d1c" src="../../../images/display/driver_bind.png" width="384" alt="driver_bind"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">显示模块的初始化顺序</span></figcaption></figure>
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</div>
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<p class="- topic/p p" data-ofbid="d73372e41__20250121171523">其中：</p>
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<ol class="- topic/ol ol" id="display_initialization_process__ol_abb_11g_d1c" data-ofbid="display_initialization_process__ol_abb_11g_d1c"><li class="- topic/li li" data-ofbid="d73372e45__20250121171523">
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<p class="- topic/p p" data-ofbid="d73372e47__20250121171523">Master 调用 component_match_add() 接口声明一个 match 队列。</p>
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</li><li class="- topic/li li" data-ofbid="d73372e50__20250121171523">
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<p class="- topic/p p" data-ofbid="d73372e52__20250121171523">Master 调用 component_master_add_with_match() 将自己注册进 component 框架。</p>
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</li><li class="- topic/li li" data-ofbid="d73372e55__20250121171523">
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<p class="- topic/p p" data-ofbid="d73372e57__20250121171523">Slave 调用 component_add()完成 slave 注册。</p>
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</li><li class="- topic/li li" data-ofbid="d73372e60__20250121171523">
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<p class="- topic/p p" data-ofbid="d73372e62__20250121171523">各模块的 probe 顺序没有约束，设备的注册和声明在 probe 函数中进行。</p>
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</li><li class="- topic/li li" data-ofbid="d73372e65__20250121171523">
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<p class="- topic/p p" data-ofbid="d73372e67__20250121171523">每个子设备都要实现自己的 bind() 和 unbind() 接口（struct component_ops），当 match 队列中的模块都完成
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probe 后，component 框架会调用模块的 bind() 接口。</p>
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</li><li class="- topic/li li" data-ofbid="d73372e70__20250121171523">
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<p class="- topic/p p" data-ofbid="d73372e72__20250121171523">各 slave 按 match 队列顺序执行 bind()，component 框架保证 master 最后执行。</p>
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</li><li class="- topic/li li" data-ofbid="d73372e75__20250121171523">
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<p class="- topic/p p" data-ofbid="d73372e77__20250121171523">aicfb->bind() 主要完成 framebuffer 申请、fb 设备注册、使能 UI 图层、使能 panel 等动作。</p>
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</li></ol>
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</section><section class="- topic/section section" id="display_initialization_process__section_bbb_11g_d1c" data-ofbid="display_initialization_process__section_bbb_11g_d1c"><h2 class="- topic/title title sectiontitle">硬件时序要求</h2><p class="- topic/p p" data-ofbid="d73372e84__20250121171523">DE、DI、panel
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三个硬件模块在初始化时有一些时序要求，包含先后顺序、延迟大小，主要约束来自于 panel 侧。 为了应对这样的硬件特性，驱动设计中使用 callback
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方式来实现多个模块间的互相调用。</p>
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<div class="- topic/p p" data-ofbid="d73372e87__20250121171523">
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<figure class="- topic/fig fig fignone" id="display_initialization_process__fig_jgb_c1g_d1c" data-ofbid="display_initialization_process__fig_jgb_c1g_d1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="display_initialization_process__image_cbb_11g_d1c" src="../../../images/display/display_callbacks.png" width="480" alt="callbacks1"/></div><br/></figure>
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</div><p class="- topic/p p" data-ofbid="d73372e94__20250121171523">在 fb 的 bind()中，会调用这些回调来完成初始化，如下图（其中关系比较绕的是 panel 初始化逻辑）：</p><div class="- topic/p p" data-ofbid="d73372e96__20250121171523"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="display_initialization_process__image_dbb_11g_d1c" src="../../../images/display/fb_bind.png" width="480" alt="fb_bind"/></div><br/></div></section></div></article></main></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#display_initialization_process__section_y1b_11g_d1c" data-tocid="display_initialization_process__section_y1b_11g_d1c">Probe 和 Bind 过程</a></div></li><li class="section-item"><div class="section-title"><a href="#display_initialization_process__section_bbb_11g_d1c" data-tocid="display_initialization_process__section_bbb_11g_d1c">硬件时序要求</a></div></li></ul></div>
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