drm/i915: Wire up PCH interrupts for bdw

Gives us hotplug, gmbus, dp aux and south errors (underrun
reporting!).

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 9304ce3e4649..44209442ff1a 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1821,6 +1821,22 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
                         DRM_ERROR("The master control interrupt lied (DE PIPE)!\n");
         }
 
+        if (!HAS_PCH_NOP(dev) && master_ctl & GEN8_DE_PCH_IRQ) {
+                /*
+                 * FIXME(BDW): Assume for now that the new interrupt handling
+                 * scheme also closed the SDE interrupt handling race we've seen
+                 * on older pch-split platforms. But this needs testing.
+                 */
+                u32 pch_iir = I915_READ(SDEIIR);
+
+                cpt_irq_handler(dev, pch_iir);
+
+                if (pch_iir) {
+                        I915_WRITE(SDEIIR, pch_iir);
+                        ret = IRQ_HANDLED;
+                }
+        }
+
         I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
         POSTING_READ(GEN8_MASTER_IRQ);