commit 8aeb7f624fbf8a68a9c67f831d4158a0f80ea920
author Mika Kuoppala <mika.kuoppala@linux.intel.com> Tue Jun 07 17:19:05 2016 +0300
committer Mika Kuoppala <mika.kuoppala@intel.com> Wed Jun 08 16:24:23 2016 +0300
tree 5cd081ad003ddb47880462919e4cea5c2de1270c
parent b033bb6d5d3a0e51d56b3ba929a8db4e18da0892

drm/i915/kbl: Add WaDisableGamClockGating

According to bspec we need to disable gam unit clock gating on
on kbl revids A0 and B0.

References: HSD#2226858, HSD#1944358
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-14-git-send-email-mika.kuoppala@intel.com

drivers/gpu/drm/i915/intel_pm.c

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 64e161f..afa5eee 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6983,6 +6983,11 @@
 	if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
 		I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
 			   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
+	/* WaDisableGamClockGating:kbl */
+	if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
+		I915_WRITE(GEN6_UCGCTL1, I915_READ(GEN6_UCGCTL1) |
+			   GEN6_GAMUNIT_CLOCK_GATE_DISABLE);
 }
 
 static void skylake_init_clock_gating(struct drm_device *dev)