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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_debug.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1><div class="date inPage">16 Dec 2024</div><div style="color: gray;">
Read time: 10 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d342572e22__20250121172117">如无特殊说明，本节描述的 DE 驱动表示显示模块的驱动，包含显示引擎模块、显示接口模块以及 LCD 的 panel 驱动，并非仅指示显示引擎。</p><p class="- topic/p p" data-ofbid="d342572e24__20250121172117">关于本节涉及的 Component、CMA 和 DMA-BUF 的详细设计描述，可查看<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="display-design_intro.html">设计说明</a>。</p><section class="- topic/section section" id="display_debug_guide__section_sqq_jyf_d1c" data-ofbid="display_debug_guide__section_sqq_jyf_d1c"><h2 class="- topic/title title sectiontitle">打开 DE 调试开关</h2>
<div class="- topic/p p" data-ofbid="d342572e35__20250121172117">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 ，进入 kernel 的功能配置，打开
DE 模块的 DEBUG
选项：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_m1n_kpn_f1c" data-ofbid="display_debug_guide__codeblock_m1n_kpn_f1c">Linux
Kernel hacking
ArtInChip Debug
[*] DE driver debug</pre></div>
<div class="- topic/p p" data-ofbid="d342572e43__20250121172117">打开 DEBUG 选项后：<ul class="- topic/ul ul" id="display_debug_guide__ol_ucp_mss_c1c" data-ofbid="display_debug_guide__ol_ucp_mss_c1c"><li class="- topic/li li" data-ofbid="d342572e46__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e48__20250121172117">驱动以<code class="+ topic/ph pr-d/codeph ph codeph">-O0</code> 编译。</p>
</li><li class="- topic/li li" data-ofbid="d342572e54__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e56__20250121172117"><span class="+ topic/keyword pr-d/parmname keyword parmname">pr_dbg()</span> 和 <span class="+ topic/keyword pr-d/parmname keyword parmname">dev_dbg()</span> 调试信息会被编译。</p>
<div class="- topic/p p" id="display_debug_guide__p_wvf_n3w_mdc" data-ofbid="display_debug_guide__p_wvf_n3w_mdc">在系统运行时，如果要打印 <span class="+ topic/keyword pr-d/parmname keyword parmname">pr_dbg()</span> 和
<span class="+ topic/keyword pr-d/parmname keyword parmname">dev_dbg()</span> 信息，还需要调整 <span class="+ topic/keyword pr-d/parmname keyword parmname">loglevel</span> 为
8，可以通过以下两种方式实现：<ul class="- topic/ul ul" id="display_debug_guide__ol_vcp_mss_c1c" data-ofbid="display_debug_guide__ol_vcp_mss_c1c"><li class="- topic/li li" data-ofbid="d342572e76__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e78__20250121172117">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中修改
<span class="+ topic/keyword pr-d/parmname keyword parmname">bootargs</span>，增加
<span class="+ topic/keyword pr-d/parmname keyword parmname">“loglevel=8”</span></p>
</li><li class="- topic/li li" data-ofbid="d342572e89__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e91__20250121172117">在板子启动到 Linux Shell
后，执行下列命令：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_wcp_mss_c1c" data-ofbid="display_debug_guide__pre_wcp_mss_c1c">echo8 &gt; /proc/sys/kernel/printk</pre></div>
</li></ul></div>
</li></ul></div>
</section><section class="- topic/section section" id="display_debug_guide__section_xqq_jyf_d1c" data-ofbid="display_debug_guide__section_xqq_jyf_d1c"><h2 class="- topic/title title sectiontitle">打开 CMA 调试开关</h2>
<div class="- topic/p p" data-ofbid="d342572e103__20250121172117">
<ol class="- topic/ol ol" id="display_debug_guide__ol_dlx_5xl_sdc" data-ofbid="display_debug_guide__ol_dlx_5xl_sdc"><li class="- topic/li li" data-ofbid="d342572e106__20250121172117">
<div class="- topic/div div">
<div class="- topic/p p" data-ofbid="d342572e110__20250121172117">在 SDK 根目录下，执行下列命令，进入 kernel
的功能配置界面：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_wg1_3ml_sdc" data-ofbid="display_debug_guide__codeblock_wg1_3ml_sdc">make kernel-menuconfig</pre></div>
<p class="- topic/p p" data-ofbid="d342572e115__20250121172117">或使用简写命令</p>
<div class="- topic/p p" data-ofbid="d342572e118__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_uss_hml_sdc" data-ofbid="display_debug_guide__codeblock_uss_hml_sdc">make km</pre>
</div>
</div>
</li><li class="- topic/li li" data-ofbid="d342572e125__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e127__20250121172117">在内核配置界面，按如下选择，打开 CMA 框架的 DEBUG
选项：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_yqq_jyf_d1c" data-ofbid="display_debug_guide__pre_yqq_jyf_d1c">Linux
Memory Management options
[*] CMA debug messages (DEVELOPMENT)
[*] CMA debugfs interface</pre></div>
</li></ol>
</div>
<div class="- topic/p p" data-ofbid="d342572e134__20250121172117">打开 DEBUG 选项后：<ul class="- topic/ul ul" id="display_debug_guide__ol_zqq_jyf_d1c" data-ofbid="display_debug_guide__ol_zqq_jyf_d1c"><li class="- topic/li li" data-ofbid="d342572e137__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e139__20250121172117">CMA 框架中 pr_debug() 调试信息会被编译</p>
</li><li class="- topic/li li" data-ofbid="d342572e142__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e144__20250121172117">debugfs 中会添加 cma 结点</p>
</li></ul></div>
</section><section class="- topic/section section" id="display_debug_guide__section_arq_jyf_d1c" data-ofbid="display_debug_guide__section_arq_jyf_d1c"><h2 class="- topic/title title sectiontitle">查看组件注册信息</h2>
<div class="- topic/p p" data-ofbid="d342572e153__20250121172117">通过以下命令查看组件的注册信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_g4j_t5j_ndc" data-ofbid="display_debug_guide__codeblock_g4j_t5j_ndc">mount -t debugfs none /sys/kernel/debug/</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_xm2_twj_ndc" data-ofbid="display_debug_guide__codeblock_xm2_twj_ndc">cat /sys/kernel/debug/device_component/soc:display-fb</pre></div>
<div class="- topic/p p" data-ofbid="d342572e160__20250121172117">组件信息输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_brq_jyf_d1c" data-ofbid="display_debug_guide__pre_brq_jyf_d1c">master name status
-------------------------------------------------------------
soc:display-fb bound
device name status
-------------------------------------------------------------
<span class="hl-number">98</span>a00000.de bound
<span class="hl-number">98800000.</span>rgb bound
panel0 bound</pre></div>
<p class="- topic/p p" data-ofbid="d342572e165__20250121172117">如果 bound 失败，控制台输出将显示 <samp class="+ topic/ph sw-d/systemoutput ph systemoutput sysout">not bound</samp>，如下所示：</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_crq_jyf_d1c" data-ofbid="display_debug_guide__pre_crq_jyf_d1c">master name status
-------------------------------------------------------------
soc:display-fb not bound
device name status
-------------------------------------------------------------
<span class="hl-number">18</span>a00000.de not bound
<span class="hl-number">18800000.</span>rgb not bound
(unknown) not registered</pre>
</section><section class="- topic/section section" id="display_debug_guide__section_drq_jyf_d1c" data-ofbid="display_debug_guide__section_drq_jyf_d1c"><h2 class="- topic/title title sectiontitle">调试 CMA</h2>
<p class="- topic/p p" data-ofbid="d342572e179__20250121172117">在 menuconfig 配置中使能 CMA debug 开关后，通过 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">debugfs</span> 调试 CMA。</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_erq_jyf_d1c" data-ofbid="display_debug_guide__pre_erq_jyf_d1c">mount -t debugfs none /sys/kernel/debug/</pre>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_wph_cvj_ndc" data-ofbid="display_debug_guide__codeblock_wph_cvj_ndc">ls /sys/kernel/debug/cma/cma-reserved/</pre>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_ugr_cvj_ndc" data-ofbid="display_debug_guide__codeblock_ugr_cvj_ndc">alloc bitmap free order_per_bit
base_pfn count maxchunk used</pre>
<div class="- topic/p p" data-ofbid="d342572e195__20250121172117"><strong class="+ topic/ph hi-d/b ph b">CMA 调试接口</strong>：<ul class="- topic/ul ul" id="display_debug_guide__ul_frq_jyf_d1c" data-ofbid="display_debug_guide__ul_frq_jyf_d1c"><li class="- topic/li li" data-ofbid="d342572e200__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e202__20250121172117"><span class="+ topic/keyword pr-d/apiname keyword apiname">alloc</span>：申请 cma 内存，以 page 为单位</p>
</li><li class="- topic/li li" data-ofbid="d342572e207__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e209__20250121172117"><span class="+ topic/keyword pr-d/apiname keyword apiname">free</span>：释放 cma 内存，以 page 为单位</p>
</li><li class="- topic/li li" data-ofbid="d342572e214__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e216__20250121172117"><span class="+ topic/keyword pr-d/apiname keyword apiname">base_pfn</span>：cma 内存起始页框号</p>
</li><li class="- topic/li li" data-ofbid="d342572e221__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e223__20250121172117"><span class="+ topic/keyword pr-d/apiname keyword apiname">count</span>：cma 总 page 数</p>
</li><li class="- topic/li li" data-ofbid="d342572e228__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e230__20250121172117"><span class="+ topic/keyword pr-d/apiname keyword apiname">maxchunk</span>：cma 最大连续 page 数</p>
</li><li class="- topic/li li" data-ofbid="d342572e235__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e237__20250121172117"><span class="+ topic/keyword pr-d/apiname keyword apiname">order_per_bit</span>：每个 bit 代表 2 ^ order_per_bit 个 page</p>
</li><li class="- topic/li li" data-ofbid="d342572e242__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e244__20250121172117"><span class="+ topic/keyword pr-d/apiname keyword apiname">bitmap</span>：记录 cma page 使用情况的位图。1 表示占用，0 表示空闲</p>
</li></ul></div>
<ul class="- topic/ul ul" id="display_debug_guide__ul_gnq_tvj_ndc" data-ofbid="display_debug_guide__ul_gnq_tvj_ndc"><li class="- topic/li li" data-ofbid="d342572e251__20250121172117">查看 CMA page 使用情况：<ul class="- topic/ul ul" id="display_debug_guide__ul_dxp_5vj_ndc" data-ofbid="display_debug_guide__ul_dxp_5vj_ndc"><li class="- topic/li li" data-ofbid="d342572e254__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_hdk_kvj_ndc" data-ofbid="display_debug_guide__codeblock_hdk_kvj_ndc">cat /sys/kernel/debug/cma/cma-reserved/bitmap</pre>
<div class="- topic/p p" data-ofbid="d342572e259__20250121172117">输出结果示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_nrq_jyf_d1c" data-ofbid="display_debug_guide__pre_nrq_jyf_d1c"><span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span>
<span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span>
<span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span>
<span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span>
<span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span>
<span class="hl-number">4294967295</span> <span class="hl-number">4294967295</span> <span class="hl-number">2097151</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span>
<span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span>
<span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span>
<span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span>
<span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e264__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e266__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_j5p_pvj_ndc" data-ofbid="display_debug_guide__codeblock_j5p_pvj_ndc">cat /sys/kernel/debug/cma/cma-reserved/count
<span class="hl-number">8192</span></pre>
</div>
</li><li class="- topic/li li" data-ofbid="d342572e273__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e275__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_hlq_qvj_ndc" data-ofbid="display_debug_guide__codeblock_hlq_qvj_ndc">cat /sys/kernel/debug/cma/cma-reserved/used
<span class="hl-number">1525</span></pre>
</div>
</li><li class="- topic/li li" data-ofbid="d342572e281__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e283__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_qtq_rvj_ndc" data-ofbid="display_debug_guide__codeblock_qtq_rvj_ndc">cat /sys/kernel/debug/cma/cma-reserved/base_pfn
<span class="hl-number">548864</span></pre>
</div>
</li><li class="- topic/li li" data-ofbid="d342572e289__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e291__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_d3l_svj_ndc" data-ofbid="display_debug_guide__codeblock_d3l_svj_ndc">cat /sys/kernel/debug/cma/cma-reserved/order_per_bit
<span class="hl-number">0</span></pre>
</div>
</li></ul><div class="- topic/p p" data-ofbid="d342572e298__20250121172117">sysfs 的 meminfo 结点亦可查看 CMA
的使用情况：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_jm2_hwj_ndc" data-ofbid="display_debug_guide__codeblock_jm2_hwj_ndc">cat /proc/meminfo</pre></div><div class="- topic/p p" data-ofbid="d342572e302__20250121172117">输出结果示例如下，已省略无关信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_qrq_jyf_d1c" data-ofbid="display_debug_guide__pre_qrq_jyf_d1c"> ...
CmaTotal: <span class="hl-number">32768</span> KB
CmaFree: <span class="hl-number">29068</span> KB</pre><div class="- topic/note note note note_note" id="display_debug_guide__note_s55_4yf_d1c" data-ofbid="display_debug_guide__note_s55_4yf_d1c"><span class="note__title">注：</span> CmaFree 中记录的信息并不准确，推荐使用 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">debugfs</span> 中 cma 节点的
<code class="+ topic/ph pr-d/codeph ph codeph">bitmap</code> 来查看 cma page 的使用情况。</div></div></li><li class="- topic/li li" data-ofbid="d342572e314__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e316__20250121172117">手动申请 100 个 page</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_orq_jyf_d1c" data-ofbid="display_debug_guide__pre_orq_jyf_d1c">echo <span class="hl-number">100</span> &gt; /sys/kernel/debug/cma/cma-reserved/alloc</pre>
</li><li class="- topic/li li" data-ofbid="d342572e322__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e324__20250121172117">手动释放 100 个
page<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_prq_jyf_d1c" data-ofbid="display_debug_guide__pre_prq_jyf_d1c">echo <span class="hl-number">100</span> &gt; /sys/kernel/debug/cma/cma-reserved/free</pre></div>
</li></ul>
</section><section class="- topic/section section" id="display_debug_guide__section_rrq_jyf_d1c" data-ofbid="display_debug_guide__section_rrq_jyf_d1c"><h2 class="- topic/title title sectiontitle">查看 DMA-BUF 使用情况</h2><p class="- topic/p p" data-ofbid="d342572e333__20250121172117">在 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">debugfs</span> 中查看当前 DMA-BUF 的使用情况：</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_srq_jyf_d1c" data-ofbid="display_debug_guide__pre_srq_jyf_d1c">mount -t debugfs none /sys/kernel/debug</pre>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_ogz_2wj_ndc" data-ofbid="display_debug_guide__codeblock_ogz_2wj_ndc">cat /sys/kernel/debug/dma_buf/bufinfo</pre><div class="- topic/p p" data-ofbid="d342572e343__20250121172117"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="display_debug_guide__image_trq_jyf_d1c" src="../../../images/display/dma_buf.png" alt="dma_buf"/></div><br/></div></section><section class="- topic/section section" id="display_debug_guide__section_urq_jyf_d1c" data-ofbid="display_debug_guide__section_urq_jyf_d1c"><h2 class="- topic/title title sectiontitle">查看 <span class="+ topic/ph sw-d/filepath ph filepath">/dev/fb</span> 信息</h2>
<ol class="- topic/ol ol" id="display_debug_guide__ol_l1j_yxj_ndc" data-ofbid="display_debug_guide__ol_l1j_yxj_ndc"><li class="- topic/li li" data-ofbid="d342572e356__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e358__20250121172117">在 sysfs 中列示所有 <span class="+ topic/ph sw-d/filepath ph filepath">/dev/fb</span>
相关信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_iyw_fwj_ndc" data-ofbid="display_debug_guide__codeblock_iyw_fwj_ndc">ls /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/ -l</pre></div>
<div class="- topic/p p" data-ofbid="d342572e366__20250121172117">输出结果示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_vrq_jyf_d1c" data-ofbid="display_debug_guide__pre_vrq_jyf_d1c">-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> bits_per_pixel
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> blank
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> console
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> cursor
-r--r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> dev
lrwxrwxrwx <span class="hl-number">1</span> root root <span class="hl-number">0</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> device -&gt; ../../../soc:display-fb
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> mode
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> modes
-r--r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> name
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> pan
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> rotate
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> state
-r--r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> stride
lrwxrwxrwx <span class="hl-number">1</span> root root <span class="hl-number">0</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> subsystem -&gt; ../../../../../../class/graphics
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> uevent
-rw-r--r-- <span class="hl-number">1</span> root root <span class="hl-number">4096</span> Jan <span class="hl-number">1</span> <span class="hl-number">00</span>:<span class="hl-number">01</span> virtual_size</pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e371__20250121172117">根据需求，查看具体信息。查看信息的命令和部分输出示例如下所示：<ul class="- topic/ul ul" id="display_debug_guide__ul_ykw_gyj_ndc" data-ofbid="display_debug_guide__ul_ykw_gyj_ndc"><li class="- topic/li li" data-ofbid="d342572e374__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_n4r_byj_ndc" data-ofbid="display_debug_guide__codeblock_n4r_byj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/bits_per_pixel</pre>
<div class="- topic/p p" data-ofbid="d342572e379__20250121172117">输出示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_j1b_4yj_ndc" data-ofbid="display_debug_guide__codeblock_j1b_4yj_ndc"><span class="hl-number">32</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e384__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_zky_cyj_ndc" data-ofbid="display_debug_guide__codeblock_zky_cyj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/blank</pre>
</li><li class="- topic/li li" data-ofbid="d342572e389__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_z43_dyj_ndc" data-ofbid="display_debug_guide__codeblock_z43_dyj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/console</pre>
</li><li class="- topic/li li" data-ofbid="d342572e394__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_lmr_dyj_ndc" data-ofbid="display_debug_guide__codeblock_lmr_dyj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/dev</pre>
<div class="- topic/p p" data-ofbid="d342572e399__20250121172117">输出示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_w4l_nyj_ndc" data-ofbid="display_debug_guide__codeblock_w4l_nyj_ndc"><span class="hl-number">29</span>:<span class="hl-number">0</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e404__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_ef1_2yj_ndc" data-ofbid="display_debug_guide__codeblock_ef1_2yj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/mode</pre>
</li><li class="- topic/li li" data-ofbid="d342572e409__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_c2j_2yj_ndc" data-ofbid="display_debug_guide__codeblock_c2j_2yj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/pan</pre>
<div class="- topic/p p" data-ofbid="d342572e414__20250121172117">输出示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_y5r_4yj_ndc" data-ofbid="display_debug_guide__codeblock_y5r_4yj_ndc"><span class="hl-number">0</span>,<span class="hl-number">0</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e419__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_rhs_2yj_ndc" data-ofbid="display_debug_guide__codeblock_rhs_2yj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/name</pre>
<div class="- topic/p p" data-ofbid="d342572e424__20250121172117">输出示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_gkb_pyj_ndc" data-ofbid="display_debug_guide__codeblock_gkb_pyj_ndc">aicfb0</pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e429__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_s4y_2yj_ndc" data-ofbid="display_debug_guide__codeblock_s4y_2yj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/stride</pre>
<div class="- topic/p p" data-ofbid="d342572e434__20250121172117">输出示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_fcn_pyj_ndc" data-ofbid="display_debug_guide__codeblock_fcn_pyj_ndc"><span class="hl-number">3200</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e439__20250121172117">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_crh_fyj_ndc" data-ofbid="display_debug_guide__codeblock_crh_fyj_ndc">cat /sys/devices/platform/soc/soc\:display-fb/graphics/fb0/virtual_size</pre>
<div class="- topic/p p" data-ofbid="d342572e444__20250121172117">输出示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_nkv_pyj_ndc" data-ofbid="display_debug_guide__codeblock_nkv_pyj_ndc"><span class="hl-number">800</span>,<span class="hl-number">480</span></pre></div>
</li></ul></li></ol>
</section><section class="- topic/section section" id="display_debug_guide__section_wrq_jyf_d1c" data-ofbid="display_debug_guide__section_wrq_jyf_d1c"><h2 class="- topic/title title sectiontitle">查看 Display Engine 信息</h2>
<div class="- topic/p p" data-ofbid="d342572e455__20250121172117">在 sysfs 中查看当前 Display Engine 的相关信息，包括 Video Layer、UI Layer、UI
Rectangle、Tearing-effect、Display Dither、Display Timing、Display Pixelclock
：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_zp5_qwj_ndc" data-ofbid="display_debug_guide__codeblock_zp5_qwj_ndc">cat /sys/devices/platform/soc/<span class="hl-number">18</span>a00000.de/debug/display</pre></div>
<div class="- topic/p p" data-ofbid="d342572e460__20250121172117">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_xrq_jyf_d1c" data-ofbid="display_debug_guide__pre_xrq_jyf_d1c">Video Layer Enable : <span class="hl-number">0</span>
Video Layer Format : <span class="hl-number">0</span>
Video Layer Input Size : <span class="hl-number">0</span> x <span class="hl-number">0</span>
Video Layer Stride : <span class="hl-number">0</span> <span class="hl-number">0</span>
Scaler Output Size : <span class="hl-number">0</span> x <span class="hl-number">0</span>
UI Layer Control : format: <span class="hl-number">0</span>, color key<a name="fnsrc_1" href="#fntarg_1" class=" topic/fn-call fn-call "><sup><span class="hl-number">1</span></sup></a>: <span class="hl-number">0</span>, alpha<a name="fnsrc_2" href="#fntarg_2" class=" topic/fn-call fn-call "><sup><span class="hl-number">2</span></sup></a>: <span class="hl-number">1</span>
UI Layer Input Size : <span class="hl-number">1024</span> x <span class="hl-number">600</span>
UI Layer Color Key<a name="fnsrc_3" href="#fntarg_3" class=" topic/fn-call fn-call "><sup><span class="hl-number">3</span></sup></a> : <span class="hl-number">0</span>
UI Layer Alpha : mode: <span class="hl-number">0</span>, g_alpha: <span class="hl-number">255</span>
UI Rectangle Control : <span class="hl-number">1</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span>
UI Rectangle Size : (<span class="hl-number">1024</span>, <span class="hl-number">600</span>) (<span class="hl-number">0</span>, <span class="hl-number">0</span>) (<span class="hl-number">0</span>, <span class="hl-number">0</span>) (<span class="hl-number">0</span>, <span class="hl-number">0</span>)
UI Rectangle Offset : (<span class="hl-number">0</span>, <span class="hl-number">0</span>) (<span class="hl-number">0</span>, <span class="hl-number">0</span>) (<span class="hl-number">0</span>, <span class="hl-number">0</span>) (<span class="hl-number">0</span>, <span class="hl-number">0</span>)
UI Rectangle Stride : <span class="hl-number">4096</span> <span class="hl-number">0</span> <span class="hl-number">0</span> <span class="hl-number">0</span>
Tearing-effect : TE mode: <span class="hl-number">0</span>, TE pulse width: <span class="hl-number">0</span>
Display Dither : dither_en: <span class="hl-number">0</span>, red depth: <span class="hl-number">0</span>, green depth: <span class="hl-number">0</span>, blue depth: <span class="hl-number">0</span>
Display Timing : hactive: <span class="hl-number">1024</span>, vactive: <span class="hl-number">600</span> hfp: <span class="hl-number">160</span> hbp: <span class="hl-number">140</span> vfp: <span class="hl-number">20</span> vbp: <span class="hl-number">12</span> hsync: <span class="hl-number">20</span> vsync: <span class="hl-number">3</span>
Display Pixelclock : <span class="hl-number">60000000</span> HZ</pre></div>
</section><section class="- topic/section section" id="display_debug_guide__section_yrq_jyf_d1c" data-ofbid="display_debug_guide__section_yrq_jyf_d1c"><h2 class="- topic/title title sectiontitle">调试 DE Color bar 模式</h2>
<div class="- topic/p p" data-ofbid="d342572e479__20250121172117">在 sysfs 中使用 Display Engine 的 Color Bar 模式进行调试：<ul class="- topic/ul ul" id="display_debug_guide__ol_q12_fxj_ndc" data-ofbid="display_debug_guide__ol_q12_fxj_ndc"><li class="- topic/li li" data-ofbid="d342572e482__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e484__20250121172117">开启 Color Bar
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__codeblock_q2y_fxj_ndc" data-ofbid="display_debug_guide__codeblock_q2y_fxj_ndc">echo <span class="hl-number">1</span> &gt; /sys/devices/platform/soc/<span class="hl-number">18</span>a00000.de/debug/color_bar</pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e489__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e491__20250121172117">关闭 Color Bar
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_zrq_jyf_d1c" data-ofbid="display_debug_guide__pre_zrq_jyf_d1c">echo <span class="hl-number">0</span> &gt; /sys/devices/platform/soc/<span class="hl-number">18</span>a00000.de/debug/color_bar</pre></div>
</li></ul></div>
</section><section class="- topic/section section" id="display_debug_guide__section_asq_jyf_d1c" data-ofbid="display_debug_guide__section_asq_jyf_d1c"><h2 class="- topic/title title sectiontitle">获取 Framebuffer 截图</h2>
<ol class="- topic/ol ol" id="display_debug_guide__ol_qzt_4xj_ndc" data-ofbid="display_debug_guide__ol_qzt_4xj_ndc"><li class="- topic/li li" data-ofbid="d342572e503__20250121172117">
<div class="- topic/p p" data-ofbid="d342572e505__20250121172117">拷贝 <span class="+ topic/ph sw-d/filepath ph filepath">/dev/fb0</span>
裸数据。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_debug_guide__pre_bsq_jyf_d1c" data-ofbid="display_debug_guide__pre_bsq_jyf_d1c">cp /dev/fb0 fb0.bgra</pre></div>
</li><li class="- topic/li li" data-ofbid="d342572e513__20250121172117">
<p class="- topic/p p" data-ofbid="d342572e515__20250121172117">使用 ADB pull 将 <span class="+ topic/ph sw-d/filepath ph filepath">fb0.bgra</span> 文件传输到 PC 上，并使用 RawViewer
软件查看。</p>
<div class="- topic/p p" data-ofbid="d342572e521__20250121172117">RawViewer 软件可在其官网免费下载。<div class="- topic/note note note note_note" id="display_debug_guide__note_jh4_txj_ndc" data-ofbid="display_debug_guide__note_jh4_txj_ndc"><span class="note__title">注：</span>
<p class="- topic/p p" data-ofbid="d342572e525__20250121172117">使用 RawViewer 查看 <span class="+ topic/ph sw-d/filepath ph filepath">fb0.bgra</span> 文件，需要手工设置数据源的宽高，在开启双
buffer 的场景下，需要将高度 * 2。</p>
</div></div>
</li></ol>
</section></div><div class="- topic/fn fn"><a name="fntarg_1" href="#fnsrc_1"><sup>1</sup></a> 表示 enable / disable 状态</div><div class="- topic/fn fn"><a name="fntarg_2" href="#fnsrc_2"><sup>2</sup></a> 表示 enable / disable 状态</div><div class="- topic/fn fn"><a name="fntarg_3" href="#fnsrc_3"><sup>3</sup></a> 表示 color value</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_debug_guide__section_sqq_jyf_d1c" data-tocid="display_debug_guide__section_sqq_jyf_d1c">打开 DE 调试开关</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_xqq_jyf_d1c" data-tocid="display_debug_guide__section_xqq_jyf_d1c">打开 CMA 调试开关</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_arq_jyf_d1c" data-tocid="display_debug_guide__section_arq_jyf_d1c">查看组件注册信息</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_drq_jyf_d1c" data-tocid="display_debug_guide__section_drq_jyf_d1c">调试 CMA</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_rrq_jyf_d1c" data-tocid="display_debug_guide__section_rrq_jyf_d1c">查看 DMA-BUF 使用情况</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_urq_jyf_d1c" data-tocid="display_debug_guide__section_urq_jyf_d1c">查看 <span class="+ topic/ph sw-d/filepath ph filepath">/dev/fb</span> 信息</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_wrq_jyf_d1c" data-tocid="display_debug_guide__section_wrq_jyf_d1c">查看 Display Engine 信息</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_yrq_jyf_d1c" data-tocid="display_debug_guide__section_yrq_jyf_d1c">调试 DE Color bar 模式</a></div></li><li class="section-item"><div class="section-title"><a href="#display_debug_guide__section_asq_jyf_d1c" data-tocid="display_debug_guide__section_asq_jyf_d1c">获取 Framebuffer 截图</a></div></li></ul></div>
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