[x86] drm/i915: shut up gen8+ SDE irq dmesg noise (Closes: #806304)
(cherry picked from commit fd13855f77
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@ -32,6 +32,7 @@ linux (4.2.6-2) UNRELEASED; urgency=medium
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* [armhf] udeb: Add stmmac platform modules dwmac-generic, dwmac-socfpga
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and dwmac-sunxi to nic-modules (Closes: #805098)
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* wireless: Enable WL_MEDIATEK, MT7601U as module
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* [x86] drm/i915: shut up gen8+ SDE irq dmesg noise (Closes: #806304)
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-- Salvatore Bonaccorso <carnil@debian.org> Tue, 10 Nov 2015 22:05:58 +0100
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@ -0,0 +1,66 @@
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From: Daniel Vetter <daniel.vetter@ffwll.ch>
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Date: Fri, 23 Oct 2015 10:56:12 +0200
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Subject: drm/i915: shut up gen8+ SDE irq dmesg noise
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Origin: http://cgit.freedesktop.org/drm-intel/commit?id=97e5ed1111dcc5300a0f59a55248cd243937a8ab
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We get tons of cases where the master interrupt handler apparently set
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a bit, with the SDEIIR disagreeing. No idea what's going on there, but
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it's consistent on gen8+, no one seems to care about it and it's
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making CI results flaky.
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Shut it up.
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No idea what's going on here, but we've had fun with PCH interrupts
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before:
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commit 44498aea293b37af1d463acd9658cdce1ecdf427
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Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
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Date: Fri Feb 22 17:05:28 2013 -0300
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drm/i915: also disable south interrupts when handling them
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Note that there's a regression report in Bugzilla, and other
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regression reports on the mailing lists keep croping up. But no ill
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effects have ever been reported. But for paranoia still keep the
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message at a debug level as a breadcrumb, just in case.
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This message was introduced in
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commit 38cc46d73ed99dd7002f1406002e52d7975d16cc
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Author: Oscar Mateo <oscar.mateo@intel.com>
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Date: Mon Jun 16 16:10:59 2014 +0100
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drm/i915/bdw: Ack interrupts before handling them (GEN8)
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v2: Improve commit message a bit.
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Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
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Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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Link: http://patchwork.freedesktop.org/patch/msgid/1445590572-23631-2-git-send-email-daniel.vetter@ffwll.ch
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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92084
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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80896
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Acked-by: Mika Kuoppala <mika.kuoppala@intel.com>
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Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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---
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drivers/gpu/drm/i915/i915_irq.c | 10 +++++++---
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1 file changed, 7 insertions(+), 3 deletions(-)
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--- a/drivers/gpu/drm/i915/i915_irq.c
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+++ b/drivers/gpu/drm/i915/i915_irq.c
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@@ -2168,9 +2168,13 @@ static irqreturn_t gen8_irq_handler(int
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I915_WRITE(SDEIIR, pch_iir);
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ret = IRQ_HANDLED;
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cpt_irq_handler(dev, pch_iir);
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- } else
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- DRM_ERROR("The master control interrupt lied (SDE)!\n");
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-
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+ } else {
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+ /*
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+ * Like on previous PCH there seems to be something
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+ * fishy going on with forwarding PCH interrupts.
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+ */
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+ DRM_DEBUG_DRIVER("The master control interrupt lied (SDE)!\n");
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+ }
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}
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I915_WRITE_FW(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
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@ -115,3 +115,4 @@ bugfix/all/unix-avoid-use-after-free-in-ep_remove_wait_queue.patch
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bugfix/all/isdn_ppp-add-checks-for-allocation-failure-in-isdn_p.patch
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bugfix/all/ppp-slip-validate-vj-compression-slot-parameters-com.patch
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bugfix/all/btrfs-fix-truncation-of-compressed-and-inlined-exten.patch
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bugfix/x86/drm-i915-shut-up-gen8-sde-irq-dmesg-noise.patch
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