drm/i915/cnl: Introduce initial Cannonlake Workarounds.

Let's inherit workarounds from previous platforms that
according to wa_database and BSpec are still valid for
Cannonlake.

v2: Add missed workarounds.
v3: Rebase
v4: Remove bad chunk that was added to rc6 disable. (Ander)
    Also remove A0 W/a that are not needed anymore.
v5: Rebase on top of CFL.
v6: Remove empty gen9_init_perctx_bb and gen9_init_indirectctx_bb
    since they don't carry any gen10 related W/a. (by Oscar).
    Also Remove A0 exclusive workaround.
v7: Remove more A0 exclusive workarounds. As pointed out by Oscar
    many workarounds were changed to be A0 only so let's remove
    them.

Cc: Oscar Mateo <oscar.mateo@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Oscar Mateo <oscar.mateo@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170815231651.975-1-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -1885,12 +1885,12 @@ static void gtt_write_workarounds(struct drm_i915_private *dev_priv)
 	 * called on driver load and after a GPU reset, so you can place
 	 * workarounds here even if they get overwritten by GPU reset.
 	 */
-	/* WaIncreaseDefaultTLBEntries:chv,bdw,skl,bxt,kbl,glk,cfl */
+	/* WaIncreaseDefaultTLBEntries:chv,bdw,skl,bxt,kbl,glk,cfl,cnl */
 	if (IS_BROADWELL(dev_priv))
 		I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW);
 	else if (IS_CHERRYVIEW(dev_priv))
 		I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_CHV);
-	else if (IS_GEN9_BC(dev_priv))
+	else if (IS_GEN9_BC(dev_priv) || IS_GEN10(dev_priv))
 		I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN9_L3_LRA_1_GPGPU_DEFAULT_VALUE_SKL);
 	else if (IS_GEN9_LP(dev_priv))
 		I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN9_L3_LRA_1_GPGPU_DEFAULT_VALUE_BXT);

drivers/gpu/drm/i915/i915_reg.h

@@ -3806,6 +3806,12 @@ enum {
 #define   PWM2_GATING_DIS		(1 << 14)
 #define   PWM1_GATING_DIS		(1 << 13)
 
+/*
+ * GEN10 clock gating regs
+ */
+#define SLICE_UNIT_LEVEL_CLKGATE	_MMIO(0x94d4)
+#define  SARBUNIT_CLKGATE_DIS		(1 << 5)
+
 /*
  * Display engine regs
  */

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -1065,6 +1065,23 @@ static int bxt_init_workarounds(struct intel_engine_cs *engine)
 	return 0;
 }
 
+static int cnl_init_workarounds(struct intel_engine_cs *engine)
+{
+	struct drm_i915_private *dev_priv = engine->i915;
+	int ret;
+
+	/* WaInPlaceDecompressionHang:cnl */
+	WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
+		   GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
+
+	/* WaEnablePreemptionGranularityControlByUMD:cnl */
+	ret= wa_ring_whitelist_reg(engine, GEN8_CS_CHICKEN1);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static int kbl_init_workarounds(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = engine->i915;
@@ -1185,6 +1202,8 @@ int init_workarounds_ring(struct intel_engine_cs *engine)
 		err =  glk_init_workarounds(engine);
 	else if (IS_COFFEELAKE(dev_priv))
 		err = cfl_init_workarounds(engine);
+	else if (IS_CANNONLAKE(dev_priv))
+		err = cnl_init_workarounds(engine);
 	else
 		err = 0;
 	if (err)

drivers/gpu/drm/i915/intel_lrc.c

@@ -1175,6 +1175,8 @@ static int intel_init_workaround_bb(struct intel_engine_cs *engine)
 		return -EINVAL;
 
 	switch (INTEL_GEN(engine->i915)) {
+	case 10:
+		return 0;
 	case 9:
 		wa_bb_fn[0] = gen9_init_indirectctx_bb;
 		wa_bb_fn[1] = gen9_init_perctx_bb;

drivers/gpu/drm/i915/intel_pm.c

@@ -8263,6 +8263,23 @@ static void gen8_set_l3sqc_credits(struct drm_i915_private *dev_priv,
 	I915_WRITE(GEN7_MISCCPCTL, misccpctl);
 }
 
+static void cannonlake_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* WaEnableChickenDCPR:cnl */
+	I915_WRITE(GEN8_CHICKEN_DCPR_1,
+		   I915_READ(GEN8_CHICKEN_DCPR_1) | MASK_WAKEMEM);
+
+	/* WaFbcWakeMemOn:cnl */
+	I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
+		   DISP_FBC_MEMORY_WAKE);
+
+	/* WaSarbUnitClockGatingDisable:cnl (pre-prod) */
+	if (IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_B0))
+		I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE,
+			   I915_READ(SLICE_UNIT_LEVEL_CLKGATE) |
+			   SARBUNIT_CLKGATE_DIS);
+}
+
 static void kabylake_init_clock_gating(struct drm_i915_private *dev_priv)
 {
 	gen9_init_clock_gating(dev_priv);
@@ -8743,7 +8760,9 @@ static void nop_init_clock_gating(struct drm_i915_private *dev_priv)
  */
 void intel_init_clock_gating_hooks(struct drm_i915_private *dev_priv)
 {
-	if (IS_SKYLAKE(dev_priv))
+	if (IS_CANNONLAKE(dev_priv))
+		dev_priv->display.init_clock_gating = cannonlake_init_clock_gating;
+	else if (IS_SKYLAKE(dev_priv))
 		dev_priv->display.init_clock_gating = skylake_init_clock_gating;
 	else if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))
 		dev_priv->display.init_clock_gating = kabylake_init_clock_gating;