drm/i915: don't save/restore panel fitter registers
authorJani Nikula <jani.nikula@intel.com>
Wed, 12 Nov 2014 14:25:42 +0000 (16:25 +0200)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Fri, 14 Nov 2014 09:29:27 +0000 (10:29 +0100)
commitf7faa1ef175d34d600df6eb21d16b596088a608e
tree299811df7e80c0ab7957ff547828fd20d3443916
parent5ea13be5badca78a11921b864db380274279c8b9
drm/i915: don't save/restore panel fitter registers

AFAICT i9xx_pfit_disable() on the GMCH display crtc disable path in
i9xx_crtc_disable() will always disable the panel fitter by writing 0 to
PFIT_CONTROL. The register save will always save/restore 0. Also we
completely recompue both in intel_gmch_panel_fitting so there's no way
we depend upon leftover bits.

Move the PFIT_CONTROL and PFIT_PGM_RATIOS save/restore to UMS
code. While at it, save/restore them both under the same conditions.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
[danvet: Make it a bit clearer that we nowhere depend upon these
bits.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_suspend.c
drivers/gpu/drm/i915/i915_ums.c