drm/i915: Remove BXT incoherent seqno write workaround

This w/a was only used for preproduction hw, which is no longer in use.
Remove the workaround to simplify the code.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170123130601.2281-2-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 8ffa496..202ce1e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1638,21 +1638,6 @@ static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
        return 0;
 }
 
-static void bxt_a_seqno_barrier(struct intel_engine_cs *engine)
-{
-       /*
-        * On BXT A steppings there is a HW coherency issue whereby the
-        * MI_STORE_DATA_IMM storing the completed request's seqno
-        * occasionally doesn't invalidate the CPU cache. Work around this by
-        * clflushing the corresponding cacheline whenever the caller wants
-        * the coherency to be guaranteed. Note that this cacheline is known
-        * to be clean at this point, since we only write it in
-        * bxt_a_set_seqno(), where we also do a clflush after the write. So
-        * this clflush in practice becomes an invalidate operation.
-        */
-       intel_flush_status_page(engine, I915_GEM_HWS_INDEX);
-}
-
 /*
  * Reserve space for 2 NOOPs at the end of each request to be
  * used as a workaround for not being allowed to do lite
@@ -1800,8 +1785,6 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
        engine->irq_enable = gen8_logical_ring_enable_irq;
        engine->irq_disable = gen8_logical_ring_disable_irq;
        engine->emit_bb_start = gen8_emit_bb_start;
-       if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1))
-               engine->irq_seqno_barrier = bxt_a_seqno_barrier;
 }
 
 static inline void