[Intel-gfx] [PATCH 5/5] drm/i915: Use the vblank power domain disallow or disable DC states.

[Dhinakaran Pandiyan]

Disable DC states before enabling vblank interrupts and conversely
enable DC states after disabling. Since the frame counter may have got
reset between disabling and enabling, use drm_crtc_vblank_restore() to
compute the missed vblanks.

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7cac07db89b9..c595b934e2dc 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2964,6 +2964,9 @@ static int gen8_enable_vblank(struct drm_device *dev, unsigned int pipe)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	unsigned long irqflags;
 
+	if (intel_display_power_vblank_get(dev_priv))
+		drm_crtc_vblank_restore(dev, pipe);
+
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 	bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
@@ -3015,6 +3018,7 @@ static void gen8_disable_vblank(struct drm_device *dev, unsigned int pipe)
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 	bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+	intel_display_power_vblank_put(dev_priv);
 }
 
 static void ibx_irq_reset(struct drm_i915_private *dev_priv)
-- 
2.11.0