drm/i915: Move vlv_init_display_clock_gating() to the display power well

The registers frobbed by vlv_init_display_clock_gating() libve inside
the disp2d power well, so frobbing them while the power well is down
results in unclaimed register access warning (and of course the values
won't stick). Let's do this setup after we know the power well is
enabled.

It's also worth noting that DSPCLK_GATE_D and CBR1_VLV lose their state
when the power well goes down, but fortunately the values we've been
writing are actually the reset defaults.

MI_ARB_VLV actually retains its value even if the power well was turned
off, we just can't access it while the power well is down.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94164
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460382992-28728-9-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

drivers/gpu/drm/i915/intel_pm.c

@@ -6882,23 +6882,10 @@ static void ivybridge_init_clock_gating(struct drm_device *dev)
 	gen6_check_mch_setup(dev);
 }
 
-static void vlv_init_display_clock_gating(struct drm_i915_private *dev_priv)
-{
-	I915_WRITE(DSPCLK_GATE_D, VRHUNIT_CLOCK_GATE_DISABLE);
-
-	/*
-	 * Disable trickle feed and enable pnd deadline calculation
-	 */
-	I915_WRITE(MI_ARB_VLV, MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE);
-	I915_WRITE(CBR1_VLV, 0);
-}
-
 static void valleyview_init_clock_gating(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	vlv_init_display_clock_gating(dev_priv);
-
 	/* WaDisableEarlyCull:vlv */
 	I915_WRITE(_3D_CHICKEN3,
 		   _MASKED_BIT_ENABLE(_3D_CHICKEN_SF_DISABLE_OBJEND_CULL));
@@ -6981,8 +6968,6 @@ static void cherryview_init_clock_gating(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	vlv_init_display_clock_gating(dev_priv);
-
 	/* WaVSRefCountFullforceMissDisable:chv */
 	/* WaDSRefCountFullforceMissDisable:chv */
 	I915_WRITE(GEN7_FF_THREAD_MODE,

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -900,6 +900,17 @@ static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
 	return enabled;
 }
 
+static void vlv_init_display_clock_gating(struct drm_i915_private *dev_priv)
+{
+	I915_WRITE(DSPCLK_GATE_D, VRHUNIT_CLOCK_GATE_DISABLE);
+
+	/*
+	 * Disable trickle feed and enable pnd deadline calculation
+	 */
+	I915_WRITE(MI_ARB_VLV, MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE);
+	I915_WRITE(CBR1_VLV, 0);
+}
+
 static void vlv_display_power_well_init(struct drm_i915_private *dev_priv)
 {
 	enum pipe pipe;
@@ -922,6 +933,8 @@ static void vlv_display_power_well_init(struct drm_i915_private *dev_priv)
 		I915_WRITE(DPLL(pipe), val);
 	}
 
+	vlv_init_display_clock_gating(dev_priv);
+
 	spin_lock_irq(&dev_priv->irq_lock);
 	valleyview_enable_display_irqs(dev_priv);
 	spin_unlock_irq(&dev_priv->irq_lock);