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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][BAT] igt@* - dmesg-warn - *ERROR* Panel status timeout"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108788#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][BAT] igt@* - dmesg-warn - *ERROR* Panel status timeout"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108788">bug 108788</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>(In reply to Martin Peres from <a href="show_bug.cgi?id=108788#c1">comment #1</a>)
<span class="quote">> This all looks rather strange. Maybe some clock gating w/a getting applied
> too late?</span >
static void ibx_init_clock_gating(struct drm_i915_private *dev_priv)
{
/*
* On Ibex Peak and Cougar Point, we need to disable clock
* gating for the panel power sequencer or it will fail to
* start up when no ports are active.
*/
I915_WRITE(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE);
}
However that should have been applied by the time the error appeared, and I
can't see any potential rmw races with that register on ilk/ibx. Also this was
a module reload test so the w/a would have been applied by the previous
incarnation already. But the symptoms are fairly suggestive though...</pre>
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