Quoting Imre Deak (2017-09-28 11:06:24)
> Only init / reset the display interrupts during power well enabling /
> disabling if the i915 interrupts are enabled. So far we did the
> init / reset during driver loading / resuming too, where
> initialization / enabling of the i915 interrupts happens only at a later
> point. This didn't cause a problem due to GEN8_MASTER_IRQ_CONTROL being
> cleared, but triggered gen3_assert_iir_is_zero() in GEN8_IRQ_INIT_NDX().
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=102988
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Signed-off-by: Imre Deak <imre.d...@intel.com>

Patch makes sense, so
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>

There's an irq powerwell! When is it taken? We don't take it for GT as
far as I am aware (we should for execlists plus whenever we enable the
user interrupt). Should we?
-Chris
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