drm/i915/kbl: Add WaDisableLSQCROPERFforOCL

Extend the scope of this workaround, already used in skl,
to also take effect in kbl.

v2: Fix KBL_REVID_E0 (Matthew)

References: HSD#2132677
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-12-git-send-email-mika.kuoppala@intel.com
(cherry picked from commit fe90581987cd5fadd2942f59f8511bcb39fdec34)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>

3 files changed, 20 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6ddd1655f6fe..b0fffa0d1c07 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2602,6 +2602,9 @@ struct drm_i915_cmd_table {
 
 #define KBL_REVID_A0            0x0
 #define KBL_REVID_B0            0x1
+#define KBL_REVID_C0            0x2
+#define KBL_REVID_D0            0x3
+#define KBL_REVID_E0            0x4
 
 #define IS_KBL_REVID(p, since, until) \
         (IS_KABYLAKE(p) && IS_REVID(p, since, until))
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 42eac37de047..cf18eace6690 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1103,15 +1103,17 @@ static inline int gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine,
                                                 uint32_t *const batch,
                                                 uint32_t index)
 {
+        struct drm_i915_private *dev_priv = engine->dev->dev_private;
         uint32_t l3sqc4_flush = (0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES);
 
         /*
-         * WaDisableLSQCROPERFforOCL:skl
+         * WaDisableLSQCROPERFforOCL:skl,kbl
          * This WA is implemented in skl_init_clock_gating() but since
          * this batch updates GEN8_L3SQCREG4 with default value we need to
          * set this bit here to retain the WA during flush.
          */
-        if (IS_SKL_REVID(engine->dev, 0, SKL_REVID_E0))
+        if (IS_SKL_REVID(dev_priv, 0, SKL_REVID_E0) ||
+            IS_KBL_REVID(dev_priv, 0, KBL_REVID_E0))
                 l3sqc4_flush |= GEN8_LQSC_RO_PERF_DIS;
 
         wa_ctx_emit(batch, index, (MI_STORE_REGISTER_MEM_GEN8 |
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index bdb3304b213c..421e03d99c28 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1207,6 +1207,19 @@ static int kbl_init_workarounds(struct intel_engine_cs *engine)
                 WA_SET_BIT_MASKED(HDC_CHICKEN0,
                                   HDC_FENCE_DEST_SLM_DISABLE);
 
+        /* GEN8_L3SQCREG4 has a dependency with WA batch so any new changes
+         * involving this register should also be added to WA batch as required.
+         */
+        if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_E0))
+                /* WaDisableLSQCROPERFforOCL:kbl */
+                I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
+                           GEN8_LQSC_RO_PERF_DIS);
+
+        /* WaDisableLSQCROPERFforOCL:kbl */
+        ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
+        if (ret)
+                return ret;
+
         return 0;
 }