This is a note to let you know that I've just added the patch titled
drm/i915: skip the first 4k of stolen memory on everything >= gen8
to the 4.9-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-skip-the-first-4k-of-stolen-memory-on-everything-gen8.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6ba0566cf2afcdb17bff882e3a95cbbcb22c4a83 Mon Sep 17 00:00:00 2001
From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Date: Wed, 14 Dec 2016 12:55:37 -0200
Subject: drm/i915: skip the first 4k of stolen memory on everything >= gen8
From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
commit 6ba0566cf2afcdb17bff882e3a95cbbcb22c4a83 upstream.
BSpec got updated and this workaround is now listed as standard
required programming for all subsequent projects. This is confirmed to
fix Skylake screen flickering issues (probably caused by the fact that
we initialized a ring in the first page of stolen, but I didn't 100%
confirm this theory).
v2: this is the patch that fixes the screen flickering, document it.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94605
Tested-by: Dominik Klementowski <dominik232@xxxxxxxxx>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Acked-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1481727338-9901-1-git-send-email-paulo.r.zanoni@xxxxxxxxx
(cherry picked from commit d43537610470d8829ebd17cd7842f47176e35ebd)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_stolen.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -55,10 +55,9 @@ int i915_gem_stolen_insert_node_in_range
return -ENODEV;
/* See the comment at the drm_mm_init() call for more about this check.
- * WaSkipStolenMemoryFirstPage:bdw,chv,kbl (incomplete)
+ * WaSkipStolenMemoryFirstPage:bdw+ (incomplete)
*/
- if (start < 4096 && (IS_GEN8(dev_priv) ||
- IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0)))
+ if (start < 4096 && INTEL_GEN(dev_priv) >= 8)
start = 4096;
mutex_lock(&dev_priv->mm.stolen_lock);
Patches currently in stable-queue which might be from paulo.r.zanoni@xxxxxxxxx are
queue-4.9/drm-i915-skip-the-first-4k-of-stolen-memory-on-everything-gen8.patch
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