drm/i915/cnl: Add WaRsDisableCoarsePowerGating

Old Wa added now forever on CNL all steppings.

With CPU P states enabled along with RC6, dispatcher
hangs can happen.

Cc: Rafael Antognolli <rafael.antognolli@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180222200535.9290-1-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -2788,9 +2788,10 @@ intel_info(const struct drm_i915_private *dev_priv)
 /* Early gen2 have a totally busted CS tlb and require pinned batches. */
 #define HAS_BROKEN_CS_TLB(dev_priv)	(IS_I830(dev_priv) || IS_I845G(dev_priv))
 
-/* WaRsDisableCoarsePowerGating:skl,bxt */
+/* WaRsDisableCoarsePowerGating:skl,cnl */
 #define NEEDS_WaRsDisableCoarsePowerGating(dev_priv) \
-	(IS_SKL_GT3(dev_priv) || IS_SKL_GT4(dev_priv))
+	(IS_CANNONLAKE(dev_priv) || \
+	 IS_SKL_GT3(dev_priv) || IS_SKL_GT4(dev_priv))
 
 /*
  * dp aux and gmbus irq on gen4 seems to be able to generate legacy interrupts

drivers/gpu/drm/i915/intel_guc.c

@@ -370,7 +370,7 @@ int intel_guc_sample_forcewake(struct intel_guc *guc)
 	u32 action[2];
 
 	action[0] = INTEL_GUC_ACTION_SAMPLE_FORCEWAKE;
-	/* WaRsDisableCoarsePowerGating:skl,bxt */
+	/* WaRsDisableCoarsePowerGating:skl,cnl */
 	if (!HAS_RC6(dev_priv) || NEEDS_WaRsDisableCoarsePowerGating(dev_priv))
 		action[1] = 0;
 	else

drivers/gpu/drm/i915/intel_pm.c

@@ -6715,7 +6715,7 @@ static void gen9_enable_rc6(struct drm_i915_private *dev_priv)
 
 	/*
 	 * 3b: Enable Coarse Power Gating only when RC6 is enabled.
-	 * WaRsDisableCoarsePowerGating:skl,bxt - Render/Media PG need to be disabled with RC6.
+	 * WaRsDisableCoarsePowerGating:skl,cnl - Render/Media PG need to be disabled with RC6.
 	 */
 	if (NEEDS_WaRsDisableCoarsePowerGating(dev_priv))
 		I915_WRITE(GEN9_PG_ENABLE, 0);