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drm/i915: Shove the PHY test into the hotplug work
Doing nay kind modeset stuff from the short hpd handler is verboten. The ad-hoc PHY test modeset code violates this. And by calling various link training related functions it's now blocking further work to plumb the crtc state down into the link training code. Let's hack around that by pushing the PHY test stuff into the hotplug work where it's less of a problem. Still not great but at least acceptable. We take a few pages from the link retraining handbook to handle the locking and whatnot. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
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