Enables blend optimization for floating point RTs

v2: Rebased on top of the WA refactoring
v3: Added References (Mika)

References: HSDES#1406393558
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.ma...@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h          | 3 +++
 drivers/gpu/drm/i915/intel_workarounds.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6e88c6b..f123c3e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2663,6 +2663,9 @@ enum i915_power_well_id {
 #define   GEN8_4x4_STC_OPTIMIZATION_DISABLE    (1<<6)
 #define   GEN9_PARTIAL_RESOLVE_IN_VC_DISABLE   (1<<1)
 
+#define GEN10_CACHE_MODE_SS                    _MMIO(0xe420)
+#define   FLOAT_BLEND_OPTIMIZATION_ENABLE      (1 << 4)
+
 #define GEN6_BLITTER_ECOSKPD   _MMIO(0x221d0)
 #define   GEN6_BLITTER_LOCK_SHIFT                      16
 #define   GEN6_BLITTER_FBC_NOTIFY                      (1<<3)
diff --git a/drivers/gpu/drm/i915/intel_workarounds.c 
b/drivers/gpu/drm/i915/intel_workarounds.c
index 33a1a0c..e9c00b0 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -479,6 +479,9 @@ static int icl_ctx_workarounds_init(struct drm_i915_private 
*dev_priv)
                WA_SET_BIT_MASKED(GEN11_COMMON_SLICE_CHICKEN3,
                                  GEN11_BLEND_EMB_FIX_DISABLE_IN_RCC);
 
+       /* WaEnableFloatBlendOptimization:icl */
+       WA_SET_BIT_MASKED(GEN10_CACHE_MODE_SS, FLOAT_BLEND_OPTIMIZATION_ENABLE);
+
        return 0;
 }
 
-- 
1.9.1

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