1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>drm_dp_update_payload_part1</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#idp1125934820" title="Display Port MST Helper Functions Reference"><link rel="prev" href="API-struct-drm-dp-mst-topology-mgr.html" title="struct drm_dp_mst_topology_mgr"><link rel="next" href="API-drm-dp-update-payload-part2.html" title="drm_dp_update_payload_part2"></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_update_payload_part1</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-drm-dp-mst-topology-mgr.html">Prev</a>&#160;</td><th width="60%" align="center">Display Port MST Helper Functions Reference</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-drm-dp-update-payload-part2.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-drm-dp-update-payload-part1"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>drm_dp_update_payload_part1 &#8212; 
2  Execute payload update part 1
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_update_payload_part1 </b>(</code></td><td>struct drm_dp_mst_topology_mgr * <var class="pdparam">mgr</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1125995164"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>mgr</code></em></span></dt><dd><p>
4     manager to use.
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1125996756"></a><h2>Description</h2><p>
6   This iterates over all proposed virtual channels, and tries to
7   allocate space in the link for them. For 0-&gt;slots transitions,
8   this step just writes the VCPI to the MST device. For slots-&gt;0
9   transitions, this writes the updated VCPIs and removes the
10   remote VC payloads.
11   </p><p>
12
13   after calling this the driver should generate ACT and payload
14   packets.
15</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-drm-dp-mst-topology-mgr.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch02s05.html#idp1125934820">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-drm-dp-update-payload-part2.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct drm_dp_mst_topology_mgr</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">drm_dp_update_payload_part2</span></td></tr></table></div></body></html>
16