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authorPaulo Zanoni <paulo.r.zanoni@intel.com>2016-12-14 12:55:37 -0200
committerJani Nikula <jani.nikula@intel.com>2016-12-20 16:30:55 +0200
commit6ba0566cf2afcdb17bff882e3a95cbbcb22c4a83 (patch)
treef4c29f8d4ddf8cb67483194d6b98a2d8fb872e16 /drivers/gpu/drm
parentabb0deacb5a6713b918ac6395182cb27bb88be69 (diff)
downloadop-kernel-dev-6ba0566cf2afcdb17bff882e3a95cbbcb22c4a83.zip
op-kernel-dev-6ba0566cf2afcdb17bff882e3a95cbbcb22c4a83.tar.gz
drm/i915: skip the first 4k of stolen memory on everything >= gen8
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 Cc: stable@vger.kernel.org Tested-by: Dominik Klementowski <dominik232@gmail.com> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1481727338-9901-1-git-send-email-paulo.r.zanoni@intel.com (cherry picked from commit d43537610470d8829ebd17cd7842f47176e35ebd) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/i915/i915_gem_stolen.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index ebaa941..abc78bb 100644
--- 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(struct drm_i915_private *dev_priv,
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);
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