1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>intel_uncore_forcewake_get</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="drmI915.html#idp1127683628" title="Runtime Power Management"><link rel="prev" href="API-intel-runtime-pm-enable.html" title="intel_runtime_pm_enable"><link rel="next" href="API-intel-uncore-forcewake-put.html" title="intel_uncore_forcewake_put"></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">intel_uncore_forcewake_get</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-intel-runtime-pm-enable.html">Prev</a>&#160;</td><th width="60%" align="center">Runtime Power Management</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-intel-uncore-forcewake-put.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-intel-uncore-forcewake-get"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>intel_uncore_forcewake_get &#8212; 
2  grab forcewake domain references
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">void <b class="fsfunc">intel_uncore_forcewake_get </b>(</code></td><td>struct drm_i915_private * <var class="pdparam">dev_priv</var>, </td></tr><tr><td>&#160;</td><td>enum forcewake_domains <var class="pdparam">fw_domains</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1127807300"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dev_priv</code></em></span></dt><dd><p>
4     i915 device instance
5    </p></dd><dt><span class="term"><em class="parameter"><code>fw_domains</code></em></span></dt><dd><p>
6     forcewake domains to get reference on
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1127809916"></a><h2>Description</h2><p>
8   This function can be used get GT's forcewake domain references.
9   Normal register access will handle the forcewake domains automatically.
10   However if some sequence requires the GT to not power down a particular
11   forcewake domains this function should be called at the beginning of the
12   sequence. And subsequently the reference should be dropped by symmetric
13   call to <code class="function">intel_unforce_forcewake_put</code>. Usually caller wants all the domains
14   to be kept awake so the <em class="parameter"><code>fw_domains</code></em> would be then FORCEWAKE_ALL.
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