]> git.karo-electronics.de Git - karo-tx-linux.git/commit
drm/i915: skip the first 4k of stolen memory on everything >= gen8
authorPaulo Zanoni <paulo.r.zanoni@intel.com>
Wed, 14 Dec 2016 14:55:37 +0000 (12:55 -0200)
committerPaulo Zanoni <paulo.r.zanoni@intel.com>
Tue, 20 Dec 2016 12:45:08 +0000 (10:45 -0200)
commitd43537610470d8829ebd17cd7842f47176e35ebd
treec347f488ad6e755cd384ffe19b86649216719f8d
parentc2dc6cc946aa8463e1e7676c8f82334c1dc8a01c
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
drivers/gpu/drm/i915/i915_gem_stolen.c