Re: [PATCH] Revert "drm/i915/icl: WaEnableFloatBlendOptimization"

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Quoting Anuj Phogat (2018-08-03 20:24:09)
> 
> 
> On Mon, Jul 30, 2018 at 5:07 AM Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> wrote:
> 
>     The register for 0xe420 is unable to hold any value, including
>     this bit. The documentation is also mixed between having a
>     register bit for toggle and having a state command setup
>     for it. Apparently the register toggle is deprecated.
> 
> 
>   CACHE_MODE_SS is not listed in
> a
> gfxspecs table 
> which lists all
> user mode
>   non-privileged registers. So,
> do you think
> making any changes
> to the register
>   from mesa will hold?

No, a privileged write to the register from inside the ring didn't
stick, so something is amiss.
-Chris
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