[Intel-gfx] [PATCH 1/2] drm/i915: make sure south port interrupts are enabled properly

[Jesse Barnes]

We were apparently relying on the defaults on BDW, which resulted in no
hotplug or AUX interrupts.

References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_irq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 261254a..f88e265 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2763,13 +2763,15 @@ static void ibx_irq_postinstall(struct drm_device *dev)
 		mask = SDE_GMBUS | SDE_AUX_MASK | SDE_TRANSB_FIFO_UNDER |
 		       SDE_TRANSA_FIFO_UNDER | SDE_POISON;
 	} else {
-		mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
+		mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT |
+			SDE_HOTPLUG_MASK_CPT;
 
 		I915_WRITE(SERR_INT, I915_READ(SERR_INT));
 	}
 
 	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
 	I915_WRITE(SDEIMR, ~mask);
+	I915_WRITE(SDEIER, mask);
 }
 
 static void gen5_gt_irq_postinstall(struct drm_device *dev)
-- 
1.8.3.2