[Bug 92084] [BDW][drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92084

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Random idea:

--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2345,6 +2345,7 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
                u32 pch_iir = I915_READ(SDEIIR);
                if (pch_iir) {
                        I915_WRITE(SDEIIR, pch_iir);
+                       POSTING_READ(SDEIIR);
                        ret = IRQ_HANDLED;

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