From: Hoath, Nicholas <nicholas.hoath@intel.com>
Date: Thu, 5 Feb 2015 10:47:21 +0000 (+0000)
Subject: drm/i915/gen9: Implement WaDisableSDEUnitClockGating
X-Git-Tag: firefly_0821_release~176^2~1915^2~35^2~65
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3dcd020a8e3ef5b5f5289a4785b85499adc7626b;p=firefly-linux-kernel-4.4.55.git

drm/i915/gen9: Implement WaDisableSDEUnitClockGating

v2: Add stepping check for WaDisableSDEUnitClockGating.

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

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 2b89aacdda90..874ec9f2023c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -56,12 +56,14 @@ static void gen9_init_clock_gating(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	/*
-	 * WaDisableSDEUnitClockGating:skl
-	 * This seems to be a pre-production w/a.
-	 */
-	I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
-		   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+	if (INTEL_REVID(dev) == SKL_REVID_A0) {
+		/*
+		 * WaDisableSDEUnitClockGating:skl
+		 * This seems to be a pre-production w/a.
+		 */
+		I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
+			   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+	}
 
 	/* Wa4x4STCOptimizationDisable:skl */
 	I915_WRITE(CACHE_MODE_1,