1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>intel_pch_fifo_underrun_irq_handler</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="ch04s02.html#idp1127966068" title="Display FIFO Underrun Reporting"><link rel="prev" href="API-intel-cpu-fifo-underrun-irq-handler.html" title="intel_cpu_fifo_underrun_irq_handler"><link rel="next" href="API-intel-create-plane-state.html" title="intel_create_plane_state"></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_pch_fifo_underrun_irq_handler</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-intel-cpu-fifo-underrun-irq-handler.html">Prev</a>&#160;</td><th width="60%" align="center">Display FIFO Underrun Reporting</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-intel-create-plane-state.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-intel-pch-fifo-underrun-irq-handler"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>intel_pch_fifo_underrun_irq_handler &#8212; 
2     handle PCH fifo underrun interrupt
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_pch_fifo_underrun_irq_handler </b>(</code></td><td>struct drm_i915_private * <var class="pdparam">dev_priv</var>, </td></tr><tr><td>&#160;</td><td>enum transcoder <var class="pdparam">pch_transcoder</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1128011348"></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>pch_transcoder</code></em></span></dt><dd><p>
6     the PCH transcoder (same as pipe on IVB and older)
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1128014028"></a><h2>Description</h2><p>
8   This handles a PCH fifo underrun interrupt, generating an underrun warning
9   into dmesg if underrun reporting is enabled and then disables the underrun
10   interrupt to avoid an irq storm.
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