drm/i915/skl: Implement WaDisableLSQCROPERFforOCL

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4cea57add113..b37604bbdf1a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2396,6 +2396,7 @@ struct drm_i915_cmd_table {
 #define SKL_REVID_B0            (0x1)
 #define SKL_REVID_C0            (0x2)
 #define SKL_REVID_D0            (0x3)
+#define SKL_REVID_E0            (0x4)
 
 /*
  * The genX designation typically refers to the render engine, so render
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b610764768d7..0fb6a4f6c6f7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5259,6 +5259,9 @@ enum skl_disp_power_wells {
 #define GEN7_L3SQCREG4                          0xb034
 #define  L3SQ_URB_READ_CAM_MATCH_DISABLE        (1<<27)
 
+#define GEN8_L3SQCREG4                          0xb118
+#define  GEN8_LQSC_RO_PERF_DIS                  (1<<27)
+
 /* GEN8 chicken */
 #define HDC_CHICKEN0                            0x7300
 #define  HDC_FENCE_DEST_SLM_DISABLE             (1<<14)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index af8dca28c505..d7750176091b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -65,6 +65,11 @@ static void skl_init_clock_gating(struct drm_device *dev)
                            GEN8_GAPSUNIT_CLOCK_GATE_DISABLE |
                            GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
         }
+
+        if (INTEL_REVID(dev) <= SKL_REVID_E0)
+                /* WaDisableLSQCROPERFforOCL:skl */
+                I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
+                           GEN8_LQSC_RO_PERF_DIS);
 }
 
 static void i915_pineview_get_mem_freq(struct drm_device *dev)