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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/bringup/bringup-back-light-config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">背光配置</h1><div class="date inPage">14 Nov 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d182913e22__20250121171625">如果没有调节背光亮度需求，仅仅是亮或黑屏，则用 GPIO 控制较为简单，只需要在 dts panel 节点中一个地方配置好就可以，如下：<div class="- topic/note note note note_note" id="bringup_背光配置__note_gdh_j3x_gdc" data-ofbid="bringup_背光配置__note_gdh_j3x_gdc"><span class="note__title">注：</span> 屏幕的调试尽量在 kernel 中完成，然后再移植到 uboot
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中。</div><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_drn_ncc_d1c" data-ofbid="bringup_背光配置__codeblock_drn_ncc_d1c">panel_xxx {
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compatible = <span class="hl-string">"artinchip,aic-general-lvds-panel"</span>;
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status = <span class="hl-string">"okay"</span>;
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enable-gpios = <&gpio_c <span class="hl-number">7</span> GPIO_ACTIVE_HIGH>; <em class="hl-comment">//背光控制引脚，须和原理图一致</em>
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port {
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panel_lvds_in: endpoint {
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remote-endpoint = <&lvds0_out>;
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};
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};</pre></div><section class="- topic/section section" id="bringup_背光配置__section_fxg_mcc_d1c" data-ofbid="bringup_背光配置__section_fxg_mcc_d1c"><h2 class="- topic/title title sectiontitle">PWM 控制背光</h2>
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<div class="- topic/p p" data-ofbid="d182913e33__20250121171625">如果有调节背光亮度的需求，则需要使用 PWM 来控制背光，配置如下参数，详细流程如下所示：<ol class="- topic/ol ol" id="bringup_背光配置__ol_fl4_4cc_d1c" data-ofbid="bringup_背光配置__ol_fl4_4cc_d1c"><li class="- topic/li li" data-ofbid="d182913e36__20250121171625">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 的 panel 节点，添加 backlight
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节点：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_rz1_pcc_d1c" data-ofbid="bringup_背光配置__codeblock_rz1_pcc_d1c">panel_xxx {
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compatible = <span class="hl-string">"artinchip,aic-general-lvds-panel"</span>;
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status = <span class="hl-string">"okay"</span>;
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<em class="hl-comment">//enable-gpios = <&gpio_c 7 GPIO_ACTIVE_HIGH>;</em>
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backlight = <&backlight>;<em class="hl-comment">//添加 backlight</em>
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port {
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panel_lvds_in: endpoint {
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remote-endpoint = <&lvds0_out>;
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};
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};</pre></li><li class="- topic/li li" data-ofbid="d182913e43__20250121171625">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中，使能 backlight
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节点：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_xmm_pcc_d1c" data-ofbid="bringup_背光配置__codeblock_xmm_pcc_d1c">backlight: backlight {
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compatible = <span class="hl-string">"pwm-backlight"</span>;
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<em class="hl-comment">/* pwm node name; pwm device No.; period_ns; pwm_polarity */</em>
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pwms = <&pwm <span class="hl-number">0</span> <span class="hl-number">1000000</span> <span class="hl-number">0</span>>; <em class="hl-comment">//硬件对应的哪一路 PWM 接口，需要和原理图确认</em>
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brightness-levels = <<span class="hl-number">0</span> <span class="hl-number">10</span> <span class="hl-number">20</span> <span class="hl-number">30</span> <span class="hl-number">40</span> <span class="hl-number">50</span> <span class="hl-number">60</span> <span class="hl-number">70</span> <span class="hl-number">80</span> <span class="hl-number">90</span> <span class="hl-number">100</span>>; <em class="hl-comment">//每一级对应的占空百分比</em>
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<strong class="hl-keyword">default</strong>-brightness-level = <<span class="hl-number">6</span>>;
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status = <span class="hl-string">"okay"</span>;
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};</pre></li><li class="- topic/li li" data-ofbid="d182913e50__20250121171625">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中，使能对应的
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PWM：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_p53_scc_d1c" data-ofbid="bringup_背光配置__codeblock_p53_scc_d1c">&pwm {
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status = <span class="hl-string">"okay"</span>; <em class="hl-comment">//PWM 节点总开关</em>
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pinctrl-names = <span class="hl-string">"default"</span>;
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pinctrl-<span class="hl-number">0</span> = <&pwm0_pins_d>; <em class="hl-comment">//添加背光控制 pinmux 引脚</em>
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<em class="hl-comment">/* mode: up-count, down-count, up-down-count
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action: none, low, high, inverse */</em>
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pwm0 {
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aic,mode = <span class="hl-string">"up-count"</span>;
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aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
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aic,rise-edge-delay = <<span class="hl-number">10</span>>;
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aic,fall-edge-delay = <<span class="hl-number">10</span>>;
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<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
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aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>;
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aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
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status = <span class="hl-string">"okay"</span>; <em class="hl-comment">//使能硬件对应那一路的 PWM 子节点</em>
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};
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......
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};</pre></li><li class="- topic/li li" data-ofbid="d182913e57__20250121171625">在 <span class="+ topic/ph sw-d/filepath ph filepath">board-u-boot.dtsi</span> 中，添加对应的 PWM
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节点：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_bhl_scc_d1c" data-ofbid="bringup_背光配置__codeblock_bhl_scc_d1c">/ {
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......
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backlight: backlight {
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u-boot,dm-pre-reloc;
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};
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};
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&pwm {
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u-boot,dm-pre-reloc;
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pwm0 {
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u-boot,dm-pre-reloc;
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};
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......
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};
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&pinctrl {
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......
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pwm0_pins_d: pwm0-<span class="hl-number">3</span> {
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u-boot,dm-pre-reloc;
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pins {
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u-boot,dm-pre-reloc;
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};
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};
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......
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};</pre></li><li class="- topic/li li" data-ofbid="d182913e64__20250121171625">确认内核中，打开如下配置<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_nhn_scc_d1c" data-ofbid="bringup_背光配置__codeblock_nhn_scc_d1c">CONFIG_PWM=y
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CONFIG_PWM_ARTINCHIP=y
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CONFIG_BACKLIGHT_PWM=y</pre></li><li class="- topic/li li" data-ofbid="d182913e68__20250121171625">确认 uboot
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中，打开如下配置<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_khq_scc_d1c" data-ofbid="bringup_背光配置__codeblock_khq_scc_d1c">CONFIG_PWM_ARTINCHIP=y
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CONFIG_BACKLIGHT_PWM=y</pre></li></ol></div>
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</section><section class="- topic/section section" id="bringup_背光配置__section_z5t_5cc_d1c" data-ofbid="bringup_背光配置__section_z5t_5cc_d1c"><h2 class="- topic/title title sectiontitle">PWM 背光测试调试</h2>
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<div class="- topic/p p" data-ofbid="d182913e78__20250121171625">
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||
<ul class="- topic/ul ul" id="bringup_背光配置__ul_mxg_mcc_d1c" data-ofbid="bringup_背光配置__ul_mxg_mcc_d1c"><li class="- topic/li li" data-ofbid="d182913e81__20250121171625">
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<p class="- topic/p p" data-ofbid="d182913e83__20250121171625">确认硬件信号的连通性。</p>
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</li><li class="- topic/li li" data-ofbid="d182913e86__20250121171625">
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<p class="- topic/p p" data-ofbid="d182913e88__20250121171625">查看启动 log 是否有异常。</p>
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</li><li class="- topic/li li" data-ofbid="d182913e91__20250121171625">
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<div class="- topic/p p" data-ofbid="d182913e93__20250121171625">查看如下命令节点是否存在，并通过命令调节背光或测试 PWM
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输出信号：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="bringup_背光配置__codeblock_mld_wcc_d1c" data-ofbid="bringup_背光配置__codeblock_mld_wcc_d1c">echo <span class="hl-number">5</span> > /sys/class/backlight/backlight/brightness <em class="hl-comment">//设置 brightness 级数, 对应到 backlight 节点设置的占空百分比。</em></pre></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="#bringup_%E8%83%8C%E5%85%89%E9%85%8D%E7%BD%AE__section_fxg_mcc_d1c" data-tocid="bringup_背光配置__section_fxg_mcc_d1c">PWM 控制背光</a></div></li><li class="section-item"><div class="section-title"><a href="#bringup_%E8%83%8C%E5%85%89%E9%85%8D%E7%BD%AE__section_z5t_5cc_d1c" data-tocid="bringup_背光配置__section_z5t_5cc_d1c">PWM 背光测试调试</a></div></li></ul></div>
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