[Bug 108788] [CI][BAT] igt@* - dmesg-warn - *ERROR* Panel status timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108788

--- Comment #3 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Martin Peres from comment #1)
> This all looks rather strange. Maybe some clock gating w/a getting applied
> too late?

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...

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