1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>drm_dp_dpcd_read_link_status</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux DRM Developer's Guide"><link rel="up" href="ch02s05.html#idp1125808116" title="Display Port Helper Functions Reference"><link rel="prev" href="API-drm-dp-dpcd-write.html" title="drm_dp_dpcd_write"><link rel="next" href="API-drm-dp-link-probe.html" title="drm_dp_link_probe"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">drm_dp_dpcd_read_link_status</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-drm-dp-dpcd-write.html">Prev</a>&#160;</td><th width="60%" align="center">Display Port Helper Functions Reference</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-drm-dp-link-probe.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-drm-dp-dpcd-read-link-status"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>drm_dp_dpcd_read_link_status &#8212; 
2     read DPCD link status (bytes 0x202-0x207)
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">drm_dp_dpcd_read_link_status </b>(</code></td><td>struct drm_dp_aux * <var class="pdparam">aux</var>, </td></tr><tr><td>&#160;</td><td>u8 <var class="pdparam">status[DP_LINK_STATUS_SIZE]</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1125882716"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>aux</code></em></span></dt><dd><p>
4     DisplayPort AUX channel
5    </p></dd><dt><span class="term"><em class="parameter"><code>status[DP_LINK_STATUS_SIZE]</code></em></span></dt><dd><p>
6     buffer to store the link status in (must be at least 6 bytes)
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1125885396"></a><h2>Description</h2><p>
8   Returns the number of bytes transferred on success or a negative error
9   code on failure.
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