drm/i915: add ibx_irq_postinstall

So we can remove duplicated code. Note that this function is used not
only on IBX, but also CPT and LPT.

Signed-off-by: Paulo Zanoni <[e-mail]>
Reviewed-by: Ben Widawsky <[e-mail]>
[danvet: Also bikeshed s/ironlake_enable_pch_hotplug/ibx_enable_hotplug
to keep consistent with our ibx for pch naming scheme.]
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/i915/i915_irq.c

···
  * This register is the same on all known PCH chips.
  */
 
-static void ironlake_enable_pch_hotplug(struct drm_device *dev)
+static void ibx_enable_hotplug(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 	u32	hotplug;
···
 	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
 }
 
+static void ibx_irq_postinstall(struct drm_device *dev)
+{
+	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+	u32 mask;
+
+	if (HAS_PCH_IBX(dev))
+		mask = SDE_HOTPLUG_MASK |
+		       SDE_GMBUS |
+		       SDE_AUX_MASK;
+	else
+		mask = SDE_HOTPLUG_MASK_CPT |
+		       SDE_GMBUS_CPT |
+		       SDE_AUX_MASK_CPT;
+
+	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
+	I915_WRITE(SDEIMR, ~mask);
+	I915_WRITE(SDEIER, mask);
+	POSTING_READ(SDEIER);
+
+	ibx_enable_hotplug(dev);
+}
+
 static int ironlake_irq_postinstall(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
···
 			   DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
 			   DE_AUX_CHANNEL_A;
 	u32 render_irqs;
-	u32 hotplug_mask;
-	u32 pch_irq_mask;
 
 	dev_priv->irq_mask = ~display_mask;
 
···
 	I915_WRITE(GTIER, render_irqs);
 	POSTING_READ(GTIER);
 
-	if (HAS_PCH_CPT(dev)) {
-		hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
-				SDE_PORTB_HOTPLUG_CPT |
-				SDE_PORTC_HOTPLUG_CPT |
-				SDE_PORTD_HOTPLUG_CPT |
-				SDE_GMBUS_CPT |
-				SDE_AUX_MASK_CPT);
-	} else {
-		hotplug_mask = (SDE_CRT_HOTPLUG |
-				SDE_PORTB_HOTPLUG |
-				SDE_PORTC_HOTPLUG |
-				SDE_PORTD_HOTPLUG |
-				SDE_GMBUS |
-				SDE_AUX_MASK);
-	}
-
-	pch_irq_mask = ~hotplug_mask;
-
-	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
-	I915_WRITE(SDEIMR, pch_irq_mask);
-	I915_WRITE(SDEIER, hotplug_mask);
-	POSTING_READ(SDEIER);
-
-	ironlake_enable_pch_hotplug(dev);
+	ibx_irq_postinstall(dev);
 
 	if (IS_IRONLAKE_M(dev)) {
 		/* Clear & enable PCU event interrupts */
···
 		DE_PLANEA_FLIP_DONE_IVB |
 		DE_AUX_CHANNEL_A_IVB;
 	u32 render_irqs;
-	u32 hotplug_mask;
-	u32 pch_irq_mask;
 
 	dev_priv->irq_mask = ~display_mask;
 
···
 	I915_WRITE(GTIER, render_irqs);
 	POSTING_READ(GTIER);
 
-	hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
-			SDE_PORTB_HOTPLUG_CPT |
-			SDE_PORTC_HOTPLUG_CPT |
-			SDE_PORTD_HOTPLUG_CPT |
-			SDE_GMBUS_CPT |
-			SDE_AUX_MASK_CPT);
-	pch_irq_mask = ~hotplug_mask;
-
-	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
-	I915_WRITE(SDEIMR, pch_irq_mask);
-	I915_WRITE(SDEIER, hotplug_mask);
-	POSTING_READ(SDEIER);
-
-	ironlake_enable_pch_hotplug(dev);
+	ibx_irq_postinstall(dev);
 
 	return 0;
 }