[Intel-gfx] [PATCH 07/10] drm/i915: Warn if irq_mask isn't ~0 during vlv/cvh display irq postinstall

[ville.syrjala at linux.intel.com]

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

We expect vlv_display_irq_reset() to have been called prior to
vlv_display_irq_postinstall() so let's WARN if that isn't the case.

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

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index f6815e47d8de..872f93dc68ff 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3318,6 +3318,9 @@ static void vlv_display_irq_postinstall(struct drm_i915_private *dev_priv)
 		I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
 	if (IS_CHERRYVIEW(dev_priv))
 		enable_mask |= I915_DISPLAY_PIPE_C_EVENT_INTERRUPT;
+
+	WARN_ON(dev_priv->irq_mask != ~0);
+
 	dev_priv->irq_mask = ~enable_mask;
 
 	GEN5_IRQ_INIT(VLV_, dev_priv->irq_mask, enable_mask);
-- 
2.7.4