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drm/i915: Short-circuit no-op vga_set_state()

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Touching the VGA registers risks a hard machine hang, at least on this
ivb machine after removing a conflicting efifb. This is more than likely
related to the discovery that VGA IO decode on the more recent PCH
platforms is terminally broken.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2014-02-07 18:37:03 -02:00 committed by Daniel Vetter
parent 75fa041de7
commit c0cc8a5566
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_display.c
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@ -11513,6 +11513,9 @@ int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
return -EIO;
}
if (!!(gmch_ctrl & INTEL_GMCH_VGA_DISABLE) == !state)
return 0;
if (state)
gmch_ctrl &= ~INTEL_GMCH_VGA_DISABLE;
else