+static void igdng_irq_preinstall(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+
+ I915_WRITE(HWSTAM, 0xeffe);
+
+ /* XXX hotplug from PCH */
+
+ I915_WRITE(DEIMR, 0xffffffff);
+ I915_WRITE(DEIER, 0x0);
+ (void) I915_READ(DEIER);
+
+ /* and GT */
+ I915_WRITE(GTIMR, 0xffffffff);
+ I915_WRITE(GTIER, 0x0);
+ (void) I915_READ(GTIER);
+}
+
+static int igdng_irq_postinstall(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+ /* enable kind of interrupts always enabled */
+ u32 display_mask = DE_MASTER_IRQ_CONTROL /*| DE_PCH_EVENT */;
+ u32 render_mask = GT_USER_INTERRUPT;
+
+ dev_priv->irq_mask_reg = ~display_mask;
+ dev_priv->de_irq_enable_reg = display_mask;
+
+ /* should always can generate irq */
+ I915_WRITE(DEIIR, I915_READ(DEIIR));
+ I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
+ I915_WRITE(DEIER, dev_priv->de_irq_enable_reg);
+ (void) I915_READ(DEIER);
+
+ /* user interrupt should be enabled, but masked initial */
+ dev_priv->gt_irq_mask_reg = 0xffffffff;
+ dev_priv->gt_irq_enable_reg = render_mask;
+
+ I915_WRITE(GTIIR, I915_READ(GTIIR));
+ I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
+ I915_WRITE(GTIER, dev_priv->gt_irq_enable_reg);
+ (void) I915_READ(GTIER);
+
+ return 0;
+}
+