[Intel-gfx] [PATCH] Revert "drm/i915/tgl: Implement Wa_1406941453"

[Chris Wilson]

Quoting Chris Wilson (2019-09-20 09:12:54)
> Our sanitychecks indicate that while this register is context
> saved/restore, the HW does not preserve this bit within the register --
> it likely doesn't exist, or one of those mythical bits that the
> architects insist does something despite all appearances to the
> contrary.
> 
> For reference, SAMPLER_MODE is already in i915_reg.h as
> GEN10_SAMPLER_MODE and is being setup in icl_ctx_workarounds_init() as
> opposed to the chosen location here of rcs_engine_wa_init).
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111754
> Fixes: 7f0cc34b5349 ("drm/i915/tgl: Implement Wa_1406941453")
> Testcase: igt/i915_selftest/live_workarounds
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> Cc: Stuart Summers <stuart.summers at intel.com>
> Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Lucas said last night in response to the CI error,

"Yes, let's revert until I find out what I should really do."

which I am going to take as a preemptive ack :)
Acked-by: Lucas De Marchi <lucas.demarchi at intel.com>
-Chris