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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW][drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92084#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW][drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92084">bug 92084</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>Random idea:
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2345,6 +2345,7 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
u32 pch_iir = I915_READ(SDEIIR);
if (pch_iir) {
I915_WRITE(SDEIIR, pch_iir);
+ POSTING_READ(SDEIIR);
ret = IRQ_HANDLED;</pre>
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