tree aff961af369cae544c2d9e50415b8f04faad1d75
parent 3414caf63421762e57b26aa999e5187b42ee1606
author Paulo Zanoni <paulo.r.zanoni@intel.com> 1376929087 -0300
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1377262352 +0200

drm/i915: grab force_wake when restoring LCPLL

If LCPLL is disabled, there's a chance we might be in package C8 state
or deeper, and we'll get a hard hang when restoring LCPLL (also, a red
led lights up on my motherboard). So grab the force_wake, which will
get us out of RC6 and, as a consequence, out of PC8+ (since we need
RC6 to get into PC8+).

Note: Discussions with hw designers are still ongoing what exactly
goes boom here. But I think we can go ahead and just merge this little
hack for now until it's clear what we actually need.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
[danvet: Add small note about the current state of the discussion
around this hack.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>