From: Imre Deak <imre.deak@intel.com>
Date: Wed, 11 Mar 2015 09:10:27 +0000 (+0200)
Subject: drm/i915/bxt: add GEN8_SDEUNIT_CLOCK_GATE_DISABLE workaround
X-Git-Tag: v5.15~15474^2~58^2~65^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=32608ca255ef0da1a70239a731a1fcdbb212d3f2;p=platform%2Fkernel%2Flinux-starfive.git

drm/i915/bxt: add GEN8_SDEUNIT_CLOCK_GATE_DISABLE workaround

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>
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 767a3e2..a3247e8 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -96,7 +96,18 @@ static void skl_init_clock_gating(struct drm_device *dev)
 
 static void bxt_init_clock_gating(struct drm_device *dev)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
 	gen9_init_clock_gating(dev);
+
+	/*
+	 * FIXME:
+	 * GEN8_SDEUNIT_CLOCK_GATE_DISABLE applies on A0 only.
+	 */
+	 /* WaDisableSDEUnitClockGating:bxt */
+	I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
+		   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
 }
 
 static void i915_pineview_get_mem_freq(struct drm_device *dev)