drm/i915: resume MST after reading back hw state
Otherwise the MST resume paths can hit DPMS paths which hit state checker paths, which hit WARN_ON, because the state checker is inconsistent with the hw. This fixes a bunch of WARN_ON's on resume after undocking. Signed-off-by: Dave Airlie <airlied@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: stable@vger.kernel.org Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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@ -706,11 +706,12 @@ static int i915_drm_resume(struct drm_device *dev)
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dev_priv->display.hpd_irq_setup(dev);
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spin_unlock_irq(&dev_priv->irq_lock);
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intel_dp_mst_resume(dev);
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drm_modeset_lock_all(dev);
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intel_modeset_setup_hw_state(dev, true);
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drm_modeset_unlock_all(dev);
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intel_dp_mst_resume(dev);
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/*
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* ... but also need to make sure that hotplug processing
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* doesn't cause havoc. Like in the driver load code we don't
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