Patch "drm/i915: Never fully mask the the EI up rps interrupt on SNB/IVB" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/i915: Never fully mask the the EI up rps interrupt on SNB/IVB

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-never-fully-mask-the-the-ei-up-rps-interrupt-on-snb-ivb.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From a7b4667a00025ac28300737c868bd4818b6d8c4d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Mon, 23 May 2016 17:42:48 +0300
Subject: drm/i915: Never fully mask the the EI up rps interrupt on SNB/IVB
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From: Ville Syrjälä <ville.syrjala@linux.intel.com>

commit a7b4667a00025ac28300737c868bd4818b6d8c4d upstream.

SNB (and IVB too I suppose) starts to misbehave if the GPU gets stuck
in an infinite batch buffer loop. The GPU apparently hogs something
critical and CPUs start to lose interrupts and whatnot. We can keep
the system limping along by unmasking some interrupts in
GEN6_PMINTRMSK. The EI up interrupt has been previously chosen for
that task, so let's never mask it.

v2: s/gen6_rps_pm_mask/gen6_sanitize_rps_pm_mask/ (Chris)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93122
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1464014568-4529-1-git-send-email-ville.syrjala@linux.intel.com
(cherry picked from commit 12c100bfa5d9103b6c4d43636fee09c31e75605a)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/intel_pm.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4526,7 +4526,8 @@ void gen6_rps_idle(struct drm_i915_priva
 		else
 			gen6_set_rps(dev_priv->dev, dev_priv->rps.idle_freq);
 		dev_priv->rps.last_adj = 0;
-		I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
+		I915_WRITE(GEN6_PMINTRMSK,
+			   gen6_sanitize_rps_pm_mask(dev_priv, ~0));
 	}
 	mutex_unlock(&dev_priv->rps.hw_lock);
 


Patches currently in stable-queue which might be from ville.syrjala@linux.intel.com are

queue-4.4/drm-edid-add-6-bpc-quirk-for-display-aeo-model-0.patch
queue-4.4/drm-i915-never-fully-mask-the-the-ei-up-rps-interrupt-on-snb-ivb.patch
queue-4.4/drm-i915-dp-revert-drm-i915-dp-fall-back-to-18-bpp-when-sink-capability-is-unknown.patch