[PATCH 10/19] drm/i915: fix GEN7_ERR_INT init/reset code

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

Same as SERR_INT and the other IIR registers: reset on
preinstall/uninstall and WARN for non-zero values at postinstall. This
one also doesn't need double-clear.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 5b60de5..9a323a9 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2677,6 +2677,9 @@ static void ironlake_irq_preinstall(struct drm_device *dev)
 
 	GEN5_IRQ_RESET(DE);
 
+	if (IS_GEN7(dev))
+		I915_WRITE(GEN7_ERR_INT, 0xffffffff);
+
 	gen5_gt_irq_preinstall(dev);
 
 	ibx_irq_preinstall(dev);
@@ -2843,7 +2846,7 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
 		extra_mask = (DE_PIPEC_VBLANK_IVB | DE_PIPEB_VBLANK_IVB |
 			      DE_PIPEA_VBLANK_IVB);
 
-		I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
+		GEN5_ASSERT_IIR_IS_ZERO(GEN7_ERR_INT);
 	} else {
 		display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
 				DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
@@ -3051,7 +3054,7 @@ static void ironlake_irq_uninstall(struct drm_device *dev)
 
 	GEN5_IRQ_RESET(DE);
 	if (IS_GEN7(dev))
-		I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
+		I915_WRITE(GEN7_ERR_INT, 0xffffffff);
 
 	GEN5_IRQ_RESET(GT);
 	if (INTEL_INFO(dev)->gen >= 6)
-- 
1.8.4.2