drm/i915: enable vblank interrupt on ironlake

so far vblank interrupt on ironlake is disabled, this would cause
bad gfx performance if userspace calls drm_wait_vblank. This patch
enables vblank interrupt on ironlake and follows vblank get/put
model.

Signed-off-by: Li Peng <peng.li@intel.com>
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 89a071a..e7472d8 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -309,6 +309,12 @@ irqreturn_t ironlake_irq_handler(struct drm_device *dev)
        if (de_iir & DE_GSE)
                ironlake_opregion_gse_intr(dev);
 
+       if (de_iir & DE_PIPEA_VBLANK)
+               drm_handle_vblank(dev, 0);
+
+       if (de_iir & DE_PIPEB_VBLANK)
+               drm_handle_vblank(dev, 1);
+
        /* check event from PCH */
        if ((de_iir & DE_PCH_EVENT) &&
            (pch_iir & SDE_HOTPLUG_MASK)) {
@@ -844,11 +850,11 @@ int i915_enable_vblank(struct drm_device *dev, int pipe)
        if (!(pipeconf & PIPEACONF_ENABLE))
                return -EINVAL;
 
-       if (IS_IRONLAKE(dev))
-               return 0;
-
        spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
-       if (IS_I965G(dev))
+       if (IS_IRONLAKE(dev))
+               ironlake_enable_display_irq(dev_priv, (pipe == 0) ? 
+                                           DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
+       else if (IS_I965G(dev))
                i915_enable_pipestat(dev_priv, pipe,
                                     PIPE_START_VBLANK_INTERRUPT_ENABLE);
        else
@@ -866,13 +872,14 @@ void i915_disable_vblank(struct drm_device *dev, int pipe)
        drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
        unsigned long irqflags;
 
-       if (IS_IRONLAKE(dev))
-               return;
-
        spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
-       i915_disable_pipestat(dev_priv, pipe,
-                             PIPE_VBLANK_INTERRUPT_ENABLE |
-                             PIPE_START_VBLANK_INTERRUPT_ENABLE);
+       if (IS_IRONLAKE(dev))
+               ironlake_disable_display_irq(dev_priv, (pipe == 0) ? 
+                                            DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
+       else
+               i915_disable_pipestat(dev_priv, pipe,
+                                     PIPE_VBLANK_INTERRUPT_ENABLE |
+                                     PIPE_START_VBLANK_INTERRUPT_ENABLE);
        spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 }
 
@@ -1015,7 +1022,8 @@ static int ironlake_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_GSE | DE_PCH_EVENT;
+       u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
+                          DE_PIPEA_VBLANK | DE_PIPEB_VBLANK;
        u32 render_mask = GT_USER_INTERRUPT;
        u32 hotplug_mask = SDE_CRT_HOTPLUG | SDE_PORTB_HOTPLUG |
                           SDE_PORTC_HOTPLUG | SDE_PORTD_HOTPLUG;

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 45da78e..2cc489b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1638,6 +1638,7 @@ static void ironlake_crtc_dpms(struct drm_crtc *crtc, int mode)
        case DRM_MODE_DPMS_OFF:
                DRM_DEBUG_KMS("crtc %d dpms off\n", pipe);
 
+               drm_vblank_off(dev, pipe);
                /* Disable display plane */
                temp = I915_READ(dspcntr_reg);
                if ((temp & DISPLAY_PLANE_ENABLE) != 0) {