drm/i915/skl: Implement WaDisableSDEUnitClockGating:skl

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@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 fa87f1ec44ec71f4375f09354da481414482d8ec..81465e65e87656b0192c5d44b1539460a40da8b5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -68,6 +68,14 @@
 
 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);
 }
 
 static void i8xx_disable_fbc(struct drm_device *dev)