From 92122789b2d699a1e82dca502940e0dd37bf6f3b Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Thu, 9 Oct 2014 12:57:42 -0700
Subject: [PATCH] drm/i915: preserve SSC if previously set v3
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Some machines may have a broken VBT or no VBT at all, but we still want
to use SSC there.  So check for it and keep it enabled if we see it
already on.  Based on an earlier fix from Kristian.

v2: honor modparam if set too (Daniel)
    read out at init time and store for panel_use_ssc() use (Jesse)
v3: trust BIOS configuration over VBT like we do for DP (Jani)

Reported-by: Kristian Høgsberg <hoegsberg@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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