Quoting Mika Kuoppala (2018-03-02 11:50:32)
> Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> > +static void i915_engines_set_mode(struct drm_i915_private *dev_priv,
> > + unsigned engine_mask,
> > + u32 mode)
> > +{
> > + struct intel_engine_cs *engine;
> > + enum intel_engine_id id;
> > +
> > + if (INTEL_GEN(dev_priv) < 3)
> > + return;
> > +
> > + for_each_engine_masked(engine, dev_priv, engine_mask, id)
> > + I915_WRITE_FW(RING_MI_MODE(engine->mmio_base), mode);
>
> Is there reason to not use gen3_stop_engine in this level?
It clears HEAD/TAIL, so undoing it in the case of no reset is a bit more
tricky.
-Chris
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