[Intel-gfx] [PATCH 05/10] drm/i915: Clear display interrupt before enabling when turning on the power well

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

For a bit of extra paranoia make sure the display irqs are all cleared
before we enabled them when turning on the power well. This should
really be the case already since the power well was off which resets
everything.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index c119610e2d57..678c6b86862e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3306,13 +3306,6 @@ static void vlv_display_irq_postinstall(struct drm_i915_private *dev_priv)
 	u32 iir_mask;
 	enum pipe pipe;
 
-	pipestat_mask = PIPESTAT_INT_STATUS_MASK |
-			PIPE_FIFO_UNDERRUN_STATUS;
-
-	for_each_pipe(dev_priv, pipe)
-		I915_WRITE(PIPESTAT(pipe), pipestat_mask);
-	POSTING_READ(PIPESTAT(PIPE_A));
-
 	pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV |
 			PIPE_CRC_DONE_INTERRUPT_STATUS;
 
@@ -3696,8 +3689,10 @@ void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv)
 
 	dev_priv->display_irqs_enabled = true;
 
-	if (intel_irqs_enabled(dev_priv))
+	if (intel_irqs_enabled(dev_priv)) {
+		vlv_display_irq_reset(dev_priv);
 		vlv_display_irq_postinstall(dev_priv);
+	}
 }
 
 void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv)
-- 
2.7.4