We still keep getting

[    4.249930] [drm:gen8_irq_handler [i915]] *ERROR* The master control 
interrupt lied (SDE)!

This reverts

commit 820da7ae46332fa709b171eb7ba57cbd023fa6df
Author: Jani Nikula <[email protected]>
Date:   Wed Nov 25 16:47:23 2015 +0200

    Revert "drm/i915: shut up gen8+ SDE irq dmesg noise"

which in itself is a revert, so this is just doing

commit 97e5ed1111dcc5300a0f59a55248cd243937a8ab
Author: Daniel Vetter <[email protected]>
Date:   Fri Oct 23 10:56:12 2015 +0200

    drm/i915: shut up gen8+ SDE irq dmesg noise

all over again. I'll stop pretending I understand what's going on like I
did when I thought I'd fixed this for good in

commit 6a39d7c986be4fd18eb019e9cdbf774ec36c9f77
Author: Jani Nikula <[email protected]>
Date:   Wed Nov 25 16:47:22 2015 +0200

    drm/i915: fix the SDE irq dmesg warnings properly

Reported-by: Chris Wilson <[email protected]>
Reference: http://mid.gmane.org/[email protected]
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92084
Cc: [email protected]
Fixes: 820da7ae4633 ("Revert "drm/i915: shut up gen8+ SDE irq dmesg noise"")
Signed-off-by: Jani Nikula <[email protected]>
---
 drivers/gpu/drm/i915/i915_irq.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 3f8c753997ba..fa8afa7860ae 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2414,9 +2414,13 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
                                spt_irq_handler(dev, pch_iir);
                        else
                                cpt_irq_handler(dev, pch_iir);
-               } else
-                       DRM_ERROR("The master control interrupt lied (SDE)!\n");
-
+               } else {
+                       /*
+                        * Like on previous PCH there seems to be something
+                        * fishy going on with forwarding PCH interrupts.
+                        */
+                       DRM_DEBUG_DRIVER("The master control interrupt lied 
(SDE)!\n");
+               }
        }
 
        I915_WRITE_FW(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
-- 
2.1.4

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