Konstantin Khlebnikov 7dcd2677ea drm/i915: fix long-standing SNB regression in power consumption after resume v2 ... This patch fixes regression in power consumtion of sandy bridge gpu, which exists since v3.6 Sometimes after resuming from s2ram gpu starts thinking that it's extremely busy. After that it never reaches rc6 state. Bug exists since kernel v3.6: commit b4ae3f22d2 Author: Jesse Barnes <jbarnes@virtuousgeek.org> Date: Thu Jun 14 11:04:48 2012 -0700 drm/i915: load boot context at driver init time For some reason RC6 is already enabled at the beginning of resuming process. Following initliaztion breaks some internal state and confuses RPS engine. This patch disables RC6 at the beginnig of resume and initialization. I've rearranged initialization sequence, because intel_disable_gt_powersave() needs initialized force_wake_get/put and some locks from the dev_priv. Note: The culprit in the initialization sequence seems to be the write to MBCTL added in the above mentioned commit. The first version of this patch just held a forcewake reference across the clock gating init functions, which seems to have been enought to gather quite a few positive test reports. But since that smelled a bit like ad-hoc duct-tape v2 now just disables rps/rc6 across the entire hw setup. References: https://bugs.freedesktop.org/show_bug.cgi?id=54089 References: https://bugzilla.kernel.org/show_bug.cgi?id=58971 References: https://patchwork.kernel.org/patch/2827634/ (patch v1) Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> [danvet: Add note about v1 vs. v2 of this patch and use standard layout for the commit citation. Also add the tested-bys from v1 and a cc: stable.] Cc: stable@vger.kernel.org (Note: tiny conflict due to the addition of the backlight lock in 3.11) Tested-by: Alexander Kaltsas <alexkaltsas@gmail.com> (v1) Tested-by: rocko <rockorequin@hotmail.com> (v1) Tested-by: JohnMB <johnmbryant@sky.com> (v1) Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>		2013-07-17 08:55:44 +02:00
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drm	drm/i915: fix long-standing SNB regression in power consumption after resume v2	2013-07-17 08:55:44 +02:00
host1x	gpu: host1x: Rework CPU syncpoint increment	2013-06-22 12:43:55 +02:00
vga	fbcon: fix locking harder	2013-02-08 12:02:43 +10:00
Makefile	gpu: host1x: Add host1x driver	2013-04-22 12:32:40 +02:00