1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>struct drm_encoder_helper_funcs</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#idp1125415036" title="Modeset Helper Functions Reference"><link rel="prev" href="API-struct-drm-crtc-helper-funcs.html" title="struct drm_crtc_helper_funcs"><link rel="next" href="API-struct-drm-connector-helper-funcs.html" title="struct drm_connector_helper_funcs"></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">struct drm_encoder_helper_funcs</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-drm-crtc-helper-funcs.html">Prev</a> </td><th width="60%" align="center">Modeset Helper Functions Reference</th><td width="20%" align="right"> <a accesskey="n" href="API-struct-drm-connector-helper-funcs.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-drm-encoder-helper-funcs"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct drm_encoder_helper_funcs — 2 helper operations for encoders 3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting"> 4struct drm_encoder_helper_funcs { 5 void (* dpms) (struct drm_encoder *encoder, int mode); 6 void (* save) (struct drm_encoder *encoder); 7 void (* restore) (struct drm_encoder *encoder); 8 bool (* mode_fixup) (struct drm_encoder *encoder,const struct drm_display_mode *mode,struct drm_display_mode *adjusted_mode); 9 void (* prepare) (struct drm_encoder *encoder); 10 void (* commit) (struct drm_encoder *encoder); 11 void (* mode_set) (struct drm_encoder *encoder,struct drm_display_mode *mode,struct drm_display_mode *adjusted_mode); 12 struct drm_crtc *(* get_crtc) (struct drm_encoder *encoder); 13 enum drm_connector_status (* detect) (struct drm_encoder *encoder,struct drm_connector *connector); 14 void (* disable) (struct drm_encoder *encoder); 15 void (* enable) (struct drm_encoder *encoder); 16 int (* atomic_check) (struct drm_encoder *encoder,struct drm_crtc_state *crtc_state,struct drm_connector_state *conn_state); 17}; </pre></div><div class="refsect1"><a name="idp1125440908"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">dpms</span></dt><dd><p> 18 set power state 19 </p></dd><dt><span class="term">save</span></dt><dd><p> 20 save connector state 21 </p></dd><dt><span class="term">restore</span></dt><dd><p> 22 restore connector state 23 </p></dd><dt><span class="term">mode_fixup</span></dt><dd><p> 24 try to fixup proposed mode for this connector 25 </p></dd><dt><span class="term">prepare</span></dt><dd><p> 26 part of the disable sequence, called before the CRTC modeset 27 </p></dd><dt><span class="term">commit</span></dt><dd><p> 28 called after the CRTC modeset 29 </p></dd><dt><span class="term">mode_set</span></dt><dd><p> 30 set this mode, optional for atomic helpers 31 </p></dd><dt><span class="term">get_crtc</span></dt><dd><p> 32 return CRTC that the encoder is currently attached to 33 </p></dd><dt><span class="term">detect</span></dt><dd><p> 34 connection status detection 35 </p></dd><dt><span class="term">disable</span></dt><dd><p> 36 disable encoder when not in use (overrides DPMS off) 37 </p></dd><dt><span class="term">enable</span></dt><dd><p> 38 enable encoder 39 </p></dd><dt><span class="term">atomic_check</span></dt><dd><p> 40 check for validity of an atomic update 41 </p></dd></dl></div></div><div class="refsect1"><a name="idp1125450028"></a><h2>Description</h2><p> 42 The helper operations are called by the mid-layer CRTC helper. 43 </p><p> 44 45 Note that with atomic helpers <em class="parameter"><code>dpms</code></em>, <em class="parameter"><code>prepare</code></em> and <em class="parameter"><code>commit</code></em> hooks are 46 deprecated. Used <em class="parameter"><code>enable</code></em> and <em class="parameter"><code>disable</code></em> instead exclusively. 47 </p><p> 48 49 With legacy crtc helpers there's a big semantic difference between <em class="parameter"><code>disable</code></em> 50</p></div><div class="refsect1"><a name="idp1125453244"></a><h2>and the other hooks</h2><p> 51 <em class="parameter"><code>disable</code></em> also needs to release any resources acquired in 52 <em class="parameter"><code>mode_set</code></em> (like shared PLLs). 53</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-crtc-helper-funcs.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02s05.html#idp1125415036">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-struct-drm-connector-helper-funcs.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct drm_crtc_helper_funcs</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">struct drm_connector_helper_funcs</span></td></tr></table></div></body></html> 54