tree d261e206fabc334e449e7c170790ad57ee754bd6
parent be46ffd48ba34189336c6fe420ff3370dcd36c60
author Daniel Vetter <daniel.vetter@ffwll.ch> 1381308432 +0200
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1385993321 +0100

drm/i915/lvds: don't restore hw state in the lid notifier for pch platforms

It's a pain for two reasons:
- The vga plane redisablign requires actual legacy vgao i/o to pull
  of. The hw engineers really botched this one here :(
- There seem to be some BIOS out there which send out lid events when
  unplugging. Together with our broken DP code, which disables the
  port when the cable is lost, this results in an immediate modeset
  call, which can hang on the wait for outstanding flips.
- Also we don't want to force a modeset on machines where it's not
  really needed, see the referenced bug.

We might want to extend this in general to also all machines that
support opregion, since there the BIOS supposedly should manage the
gfx hardware more cooperatively.

v2: Pimp commit message a bit.

Cc: Roland Dreier <roland@kernel.org>
References: https://bugs.freedesktop.org/show_bug.cgi?id=65486
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>