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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/dvp/dvp_debug.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1><div class="date inPage">17 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="dvp_debug_guide__section_jxx_tyg_d1c" data-ofbid="dvp_debug_guide__section_jxx_tyg_d1c"><h2 class="- topic/title title sectiontitle">调试开关</h2>
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<ol class="- topic/ol ol" id="dvp_debug_guide__ol_otl_bqq_sdc" data-ofbid="dvp_debug_guide__ol_otl_bqq_sdc"><li class="- topic/li li" data-ofbid="d136838e28__20250121171607">
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<div class="- topic/div div">
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<div class="- topic/p p" data-ofbid="d136838e32__20250121171607">在 SDK 根目录下，执行下列命令，进入 kernel
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的功能配置界面：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_wg1_3ml_sdc" data-ofbid="dvp_debug_guide__codeblock_wg1_3ml_sdc">make kernel-menuconfig</pre></div>
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<p class="- topic/p p" data-ofbid="d136838e37__20250121171607">或使用简写命令</p>
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<div class="- topic/p p" data-ofbid="d136838e40__20250121171607">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_uss_hml_sdc" data-ofbid="dvp_debug_guide__codeblock_uss_hml_sdc">make km</pre>
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</div>
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</div>
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</li><li class="- topic/li li" data-ofbid="d136838e47__20250121171607">
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<div class="- topic/p p" data-ofbid="d136838e49__20250121171607">在内核配置界面，打开 DVP 模块的 DEBUG
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选项：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__pre_kxx_tyg_d1c" data-ofbid="dvp_debug_guide__pre_kxx_tyg_d1c">Linux
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Kernel hacking
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Artinchip Debug
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[*] DVP driver debug</pre></div>
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</li></ol>
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<div class="- topic/p p" data-ofbid="d136838e55__20250121171607">打开 DEBUG 选项后：<ul class="- topic/ul ul" id="dvp_debug_guide__ol_ucp_mss_c1c" data-ofbid="dvp_debug_guide__ol_ucp_mss_c1c"><li class="- topic/li li" data-ofbid="d136838e58__20250121171607">
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<p class="- topic/p p" data-ofbid="d136838e60__20250121171607">驱动以<code class="+ topic/ph pr-d/codeph ph codeph">-O0</code> 编译。</p>
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</li><li class="- topic/li li" data-ofbid="d136838e66__20250121171607">
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<p class="- topic/p p" data-ofbid="d136838e68__20250121171607"><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>
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<div class="- topic/p p" id="dvp_debug_guide__p_wvf_n3w_mdc" data-ofbid="dvp_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
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<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
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8，可以通过以下两种方式实现：<ul class="- topic/ul ul" id="dvp_debug_guide__ol_vcp_mss_c1c" data-ofbid="dvp_debug_guide__ol_vcp_mss_c1c"><li class="- topic/li li" data-ofbid="d136838e88__20250121171607">
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<p class="- topic/p p" data-ofbid="d136838e90__20250121171607">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中修改
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<span class="+ topic/keyword pr-d/parmname keyword parmname">bootargs</span>，增加
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<span class="+ topic/keyword pr-d/parmname keyword parmname">“loglevel=8”</span></p>
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</li><li class="- topic/li li" data-ofbid="d136838e101__20250121171607">
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<div class="- topic/p p" data-ofbid="d136838e103__20250121171607">在板子启动到 Linux Shell
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后，执行下列命令：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__pre_wcp_mss_c1c" data-ofbid="dvp_debug_guide__pre_wcp_mss_c1c">echo8 > /proc/sys/kernel/printk</pre></div>
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</li></ul></div>
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</li></ul></div>
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</section><section class="- topic/section section" id="dvp_debug_guide__section_oxx_tyg_d1c" data-ofbid="dvp_debug_guide__section_oxx_tyg_d1c"><h2 class="- topic/title title sectiontitle">Sysfs 节点</h2>
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<div class="- topic/p p" data-ofbid="d136838e115__20250121171607">
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<ol class="- topic/ol ol" id="dvp_debug_guide__ol_pwb_wyg_d1c" data-ofbid="dvp_debug_guide__ol_pwb_wyg_d1c"><li class="- topic/li li" data-ofbid="d136838e118__20250121171607">
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<div class="- topic/p p" data-ofbid="d136838e120__20250121171607">在 Sysfs 中查看 video 设备的信息：<ul class="- topic/ul ul" id="dvp_debug_guide__ul_cnf_l1m_sdc" data-ofbid="dvp_debug_guide__ul_cnf_l1m_sdc"><li class="- topic/li li" data-ofbid="d136838e123__20250121171607">查看 <code class="+ topic/ph pr-d/codeph ph codeph">/dev/video0</code>
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设备的信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_nyq_wyg_d1c" data-ofbid="dvp_debug_guide__codeblock_nyq_wyg_d1c">ls /dev/video0 -l</pre><div class="- topic/p p" data-ofbid="d136838e130__20250121171607">输出结果示例如下，其中主设备号为
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81，次设备号为
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0：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_gx2_31m_sdc" data-ofbid="dvp_debug_guide__codeblock_gx2_31m_sdc">crw------- <span class="hl-number">1</span> root root <span class="hl-number">81</span>, <span class="hl-number">0</span> Jan <span class="hl-number">1</span> <span class="hl-number">1970</span> /dev/video0</pre></div></li><li class="- topic/li li" data-ofbid="d136838e134__20250121171607">查看 <code class="+ topic/ph pr-d/codeph ph codeph">/sys/class/video4linux/v4l-subdev0/</code>
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目录中的文件，了解视频子设备的详细信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_ozv_31m_sdc" data-ofbid="dvp_debug_guide__codeblock_ozv_31m_sdc">ls /sys/class/video4linux/v4l-subdev0/</pre><div class="- topic/p p" data-ofbid="d136838e141__20250121171607">输出结果示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_mbd_j1m_sdc" data-ofbid="dvp_debug_guide__codeblock_mbd_j1m_sdc">dev dev_debug device index name subsystem uevent</pre></div></li><li class="- topic/li li" data-ofbid="d136838e145__20250121171607">通过 <code class="+ topic/ph pr-d/codeph ph codeph">cat</code> 命令查看特定文件的内容，例如 <code class="+ topic/ph pr-d/codeph ph codeph">name</code>
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文件：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_sdm_j1m_sdc" data-ofbid="dvp_debug_guide__codeblock_sdm_j1m_sdc">cat /sys/class/video4linux/v4l-subdev0/name</pre><p class="- topic/p p" data-ofbid="d136838e155__20250121171607">输出结果示例如下，表示视频子设备的名称是
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<code class="+ topic/ph pr-d/codeph ph codeph">ov5640
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3-003c</code>：</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_wft_j1m_sdc" data-ofbid="dvp_debug_guide__codeblock_wft_j1m_sdc">ov5640 <span class="hl-number">3</span>-<span class="hl-number">003</span>c</pre></li><li class="- topic/li li" data-ofbid="d136838e162__20250121171607">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_sdb_k1m_sdc" data-ofbid="dvp_debug_guide__codeblock_sdb_k1m_sdc">cat /sys/class/video4linux/v4l-subdev1/name</pre>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_s3j_k1m_sdc" data-ofbid="dvp_debug_guide__codeblock_s3j_k1m_sdc">aic-dvp-sd</pre>
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||
</li><li class="- topic/li li" data-ofbid="d136838e170__20250121171607">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_jrp_k1m_sdc" data-ofbid="dvp_debug_guide__codeblock_jrp_k1m_sdc">ls -l /sys/class/video4linux/</pre>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_dsw_k1m_sdc" data-ofbid="dvp_debug_guide__codeblock_dsw_k1m_sdc">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">12</span> v4l-subdev0 -> ../../devices/platform/soc/<span class="hl-number">99223000.</span>i2c/i2c-<span class="hl-number">3</span>/<span class="hl-number">3</span>-<span class="hl-number">003</span>c/video4linux/v4l-subdev0
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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">12</span> v4l-subdev1 -> ../../devices/platform/soc/<span class="hl-number">98830000.</span>dvp/video4linux/v4l-subdev1
|
||
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">12</span> video0 -> ../../devices/platform/soc/<span class="hl-number">98830000.</span>dvp/video4linux/video0</pre>
|
||
</li></ul></div>
|
||
</li><li class="- topic/li li" data-ofbid="d136838e179__20250121171607">
|
||
<p class="- topic/p p" data-ofbid="d136838e181__20250121171607">向对应的 Sysfs 节点写入一个整数值，修改 debug level，打开 V4L2 的 debug 开关。</p>
|
||
<div class="- topic/p p" data-ofbid="d136838e184__20250121171607">例如，设置不同的模块和设备的 Debug 级别为
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3（即显示所有调试信息）：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_rsr_yyg_d1c" data-ofbid="dvp_debug_guide__codeblock_rsr_yyg_d1c">echo <span class="hl-number">0x3</span> > /sys/module/videobuf2_v4l2/parameters/debug
|
||
echo <span class="hl-number">0x3</span> > /sys/module/videobuf2_common/parameters/debug
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echo <span class="hl-number">0x3</span> > /sys/devices/platform/soc/<span class="hl-number">18830000.</span>dvp/video4linux/v4l-subdev1/dev_debug
|
||
echo <span class="hl-number">0x3</span> > /sys/devices/platform/soc/<span class="hl-number">18830000.</span>dvp/video4linux/video0/dev_debug
|
||
</pre></div>
|
||
<p class="- topic/p p" data-ofbid="d136838e189__20250121171607">V4L2 子系统使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">dprintk(level)</span> 接口来控制调试信息。当
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dprintk(level)</span> 中的 level 值大于代码中的
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||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dprintk(level)</span> 调用的 level
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||
值即可打印信息。<span class="+ topic/keyword pr-d/apiname keyword apiname">dprintk()</span> 一般用到两个 debug level：</p>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="dvp_debug_guide__table_rxx_tyg_d1c" data-ofbid="dvp_debug_guide__table_rxx_tyg_d1c" data-cols="2"><caption></caption><colgroup><col style="width:25.510204081632654%"/><col style="width:74.48979591836735%"/></colgroup><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1">1</td><td class="- topic/entry entry colsep-0 rowsep-1">显示 ioctl 名称</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0">2</td><td class="- topic/entry entry colsep-0 rowsep-0">显示 API 的传入参数</td></tr></tbody></table></div>
|
||
</li><li class="- topic/li li" data-ofbid="d136838e220__20250121171607">查看 DVP 的 Buf 队列情况<p class="- topic/p p" data-ofbid="d136838e222__20250121171607">DVP 驱动中实现了一个 sysfs 节点 buflist，查看当前三个 Qbuf、DQbuf、DVP 驱动中的
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buf list
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||
状态：</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__pre_uxx_tyg_d1c" data-ofbid="dvp_debug_guide__pre_uxx_tyg_d1c">cat /sys/devices/platform/soc/<span class="hl-number">18830000.</span>dvp/buflist</pre><div class="- topic/p p" data-ofbid="d136838e226__20250121171607">输出结果示例如下，表示当前
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DVP 驱动中的缓冲区列表状态，其中 Q-buf 和 DQ-buf 列表均为空，而 D-buf
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||
列表中的所有缓冲区都处于完成状态：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_debug_guide__codeblock_vsq_hbm_sdc" data-ofbid="dvp_debug_guide__codeblock_vsq_hbm_sdc">In dvp->buf_list, the current buf <strong class="+ topic/ph hi-d/b ph b">in</strong> list:
|
||
[<span class="hl-number">0</span>]: empty
|
||
[<span class="hl-number">1</span>]: empty
|
||
[<span class="hl-number">2</span>]: empty
|
||
|
||
In V4L2 Q-buf list:
|
||
[<span class="hl-number">0</span>]: empty
|
||
[<span class="hl-number">1</span>]: empty
|
||
[<span class="hl-number">2</span>]: empty
|
||
|
||
In V4L2 DQ-buf list:
|
||
[<span class="hl-number">0</span>], state: Done
|
||
[<span class="hl-number">1</span>], state: Done
|
||
[<span class="hl-number">2</span>], state: Done
|
||
</pre></div></li></ol>
|
||
</div>
|
||
</section><section class="- topic/section section" id="dvp_debug_guide__section_vxx_tyg_d1c" data-ofbid="dvp_debug_guide__section_vxx_tyg_d1c"><h2 class="- topic/title title sectiontitle">V4L2 相关的其他工具</h2>
|
||
|
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<ul class="- topic/ul ul" id="dvp_debug_guide__ul_wxx_tyg_d1c" data-ofbid="dvp_debug_guide__ul_wxx_tyg_d1c"><li class="- topic/li li" data-ofbid="d136838e241__20250121171607">
|
||
<p class="- topic/p p" data-ofbid="d136838e243__20250121171607">V4l2-ctl，v4l2 的命令行工具，用于管理和控制 Linux 系统中的视频设备。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d136838e246__20250121171607">
|
||
<p class="- topic/p p" data-ofbid="d136838e248__20250121171607">V4l2 兼容性测试</p>
|
||
</li><li class="- topic/li li" data-ofbid="d136838e251__20250121171607">
|
||
<p class="- topic/p p" data-ofbid="d136838e253__20250121171607">V4l2-dbg，</p>
|
||
</li><li class="- topic/li li" data-ofbid="d136838e256__20250121171607">
|
||
<p class="- topic/p p" data-ofbid="d136838e258__20250121171607">qv4l2，QT 测试程序</p>
|
||
</li></ul>
|
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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="#dvp_debug_guide__section_jxx_tyg_d1c" data-tocid="dvp_debug_guide__section_jxx_tyg_d1c">调试开关</a></div></li><li class="section-item"><div class="section-title"><a href="#dvp_debug_guide__section_oxx_tyg_d1c" data-tocid="dvp_debug_guide__section_oxx_tyg_d1c">Sysfs 节点</a></div></li><li class="section-item"><div class="section-title"><a href="#dvp_debug_guide__section_vxx_tyg_d1c" data-tocid="dvp_debug_guide__section_vxx_tyg_d1c">V4L2 相关的其他工具</a></div></li></ul></div>
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