drm/i915: Introduce bdw_{update,enable,disable}_pipe_irq()

Pull the BDW+ DE pipe interrupt mask frobbing into a central place,
like we have for other platforms.

v2: Fix the kerneldoc (Daniel)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448294777-13722-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -2764,6 +2764,20 @@ ilk_disable_display_irq(struct drm_i915_private *dev_priv, uint32_t bits)
 {
 	ilk_update_display_irq(dev_priv, bits, 0);
 }
+void bdw_update_pipe_irq(struct drm_i915_private *dev_priv,
+			 enum pipe pipe,
+			 uint32_t interrupt_mask,
+			 uint32_t enabled_irq_mask);
+static inline void bdw_enable_pipe_irq(struct drm_i915_private *dev_priv,
+				       enum pipe pipe, uint32_t bits)
+{
+	bdw_update_pipe_irq(dev_priv, pipe, bits, bits);
+}
+static inline void bdw_disable_pipe_irq(struct drm_i915_private *dev_priv,
+					enum pipe pipe, uint32_t bits)
+{
+	bdw_update_pipe_irq(dev_priv, pipe, bits, 0);
+}
 void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
 				  uint32_t interrupt_mask,
 				  uint32_t enabled_irq_mask);

drivers/gpu/drm/i915/i915_irq.c

@@ -437,6 +437,38 @@ static void bdw_update_port_irq(struct drm_i915_private *dev_priv,
 	}
 }
 
+/**
+ * bdw_update_pipe_irq - update DE pipe interrupt
+ * @dev_priv: driver private
+ * @pipe: pipe whose interrupt to update
+ * @interrupt_mask: mask of interrupt bits to update
+ * @enabled_irq_mask: mask of interrupt bits to enable
+ */
+void bdw_update_pipe_irq(struct drm_i915_private *dev_priv,
+			 enum pipe pipe,
+			 uint32_t interrupt_mask,
+			 uint32_t enabled_irq_mask)
+{
+	uint32_t new_val;
+
+	assert_spin_locked(&dev_priv->irq_lock);
+
+	WARN_ON(enabled_irq_mask & ~interrupt_mask);
+
+	if (WARN_ON(!intel_irqs_enabled(dev_priv)))
+		return;
+
+	new_val = dev_priv->de_irq_mask[pipe];
+	new_val &= ~interrupt_mask;
+	new_val |= (~enabled_irq_mask & interrupt_mask);
+
+	if (new_val != dev_priv->de_irq_mask[pipe]) {
+		dev_priv->de_irq_mask[pipe] = new_val;
+		I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
+		POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
+	}
+}
+
 /**
  * ibx_display_interrupt_update - update SDEIMR
  * @dev_priv: driver private
@@ -2668,10 +2700,9 @@ static int gen8_enable_vblank(struct drm_device *dev, unsigned int pipe)
 	unsigned long irqflags;
 
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
-	dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_VBLANK;
-	I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
-	POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
+	bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
 	return 0;
 }
 
@@ -2719,9 +2750,7 @@ static void gen8_disable_vblank(struct drm_device *dev, unsigned int pipe)
 	unsigned long irqflags;
 
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
-	dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_VBLANK;
-	I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
-	POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
+	bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 }
 

drivers/gpu/drm/i915/intel_fifo_underrun.c

@@ -178,14 +178,10 @@ static void broadwell_set_fifo_underrun_reporting(struct drm_device *dev,
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	assert_spin_locked(&dev_priv->irq_lock);
-
 	if (enable)
-		dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_FIFO_UNDERRUN;
+		bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_FIFO_UNDERRUN);
 	else
-		dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_FIFO_UNDERRUN;
-	I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
-	POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
+		bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_FIFO_UNDERRUN);
 }
 
 static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,