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[x86] drm/i915: shut up gen8+ SDE irq dmesg noise (Closes: #806304) 

(cherry picked from commit fd13855f77)
This commit is contained in:
Ben Hutchings 2015-11-26 20:47:26 +00:00
parent 37aa7dc44d
commit b1805eb5b3
3 changed files with 68 additions and 0 deletions
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1
debian/changelog vendored
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@ -32,6 +32,7 @@ linux (4.2.6-2) UNRELEASED; urgency=medium
* [armhf] udeb: Add stmmac platform modules dwmac-generic, dwmac-socfpga
and dwmac-sunxi to nic-modules (Closes: #805098)
* wireless: Enable WL_MEDIATEK, MT7601U as module
* [x86] drm/i915: shut up gen8+ SDE irq dmesg noise (Closes: #806304)
-- Salvatore Bonaccorso <carnil@debian.org> Tue, 10 Nov 2015 22:05:58 +0100

66
debian/patches/bugfix/x86/drm-i915-shut-up-gen8-sde-irq-dmesg-noise.patch vendored Normal file
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@ -0,0 +1,66 @@
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Fri, 23 Oct 2015 10:56:12 +0200
Subject: drm/i915: shut up gen8+ SDE irq dmesg noise
Origin: http://cgit.freedesktop.org/drm-intel/commit?id=97e5ed1111dcc5300a0f59a55248cd243937a8ab
We get tons of cases where the master interrupt handler apparently set
a bit, with the SDEIIR disagreeing. No idea what's going on there, but
it's consistent on gen8+, no one seems to care about it and it's
making CI results flaky.
Shut it up.
No idea what's going on here, but we've had fun with PCH interrupts
before:
commit 44498aea293b37af1d463acd9658cdce1ecdf427
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Fri Feb 22 17:05:28 2013 -0300
drm/i915: also disable south interrupts when handling them
Note that there's a regression report in Bugzilla, and other
regression reports on the mailing lists keep croping up. But no ill
effects have ever been reported. But for paranoia still keep the
message at a debug level as a breadcrumb, just in case.
This message was introduced in
commit 38cc46d73ed99dd7002f1406002e52d7975d16cc
Author: Oscar Mateo <oscar.mateo@intel.com>
Date: Mon Jun 16 16:10:59 2014 +0100
drm/i915/bdw: Ack interrupts before handling them (GEN8)
v2: Improve commit message a bit.
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1445590572-23631-2-git-send-email-daniel.vetter@ffwll.ch
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92084
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80896
Acked-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/i915_irq.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2168,9 +2168,13 @@ static irqreturn_t gen8_irq_handler(int
I915_WRITE(SDEIIR, pch_iir);
ret = IRQ_HANDLED;
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);

1
debian/patches/series vendored
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@ -115,3 +115,4 @@ bugfix/all/unix-avoid-use-after-free-in-ep_remove_wait_queue.patch
bugfix/all/isdn_ppp-add-checks-for-allocation-failure-in-isdn_p.patch
bugfix/all/ppp-slip-validate-vj-compression-slot-parameters-com.patch
bugfix/all/btrfs-fix-truncation-of-compressed-and-inlined-exten.patch
bugfix/x86/drm-i915-shut-up-gen8-sde-irq-dmesg-noise.patch