drm/i915: Add WaInsertDummyPushConstP for bxt and kbl

Add this workaround for both bxt and kbl up to until
rev B0.

References: HSD#2136703
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-16-git-send-email-mika.kuoppala@intel.com
(cherry picked from commit ad2bdb44b19529ba992bd0b7667e91b14fe9a9ee)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b7cfb38c3fb8..349470d0ff1c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6084,6 +6084,7 @@ enum skl_disp_power_wells {
 # define GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC      ((1<<10) | (1<<26))
 # define GEN9_RHWO_OPTIMIZATION_DISABLE         (1<<14)
 #define COMMON_SLICE_CHICKEN2                   _MMIO(0x7014)
+# define GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION (1<<8)
 # define GEN8_CSC2_SBE_VUE_CACHE_CONSERVATIVE   (1<<0)
 
 #define HIZ_CHICKEN                                     _MMIO(0x7018)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8106a700681a..da9d243aaf34 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1186,6 +1186,11 @@ static int bxt_init_workarounds(struct intel_engine_cs *engine)
                         return ret;
         }
 
+        /* WaInsertDummyPushConstPs:bxt */
+        if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_B0))
+                WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
+                                  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
+
         return 0;
 }
 
@@ -1220,6 +1225,11 @@ static int kbl_init_workarounds(struct intel_engine_cs *engine)
                 I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
                            GEN8_LQSC_RO_PERF_DIS);
 
+        /* WaInsertDummyPushConstPs:kbl */
+        if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
+                WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
+                                  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
+
         /* WaDisableLSQCROPERFforOCL:kbl */
         ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
         if (ret)