On Wed, 17 Jul 2013 10:22:58 +0400
Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> wrote:
> 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 b4ae3f22d238617ca11610b29fde16cf8c0bc6e0
> ("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.
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=54089
> References: https://bugzilla.kernel.org/show_bug.cgi?id=58971
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
> ---
My hero!
So the later init change didn't work?
Either way, great to have this fix in the tree... thanks again.
--
Jesse Barnes, Intel Open Source Technology Center
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