From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Thu, 14 Aug 2014 22:21:54 +0000 (+0300)
Subject: drm/i915: Disable trickle feed for gen2/3
X-Git-Tag: fixes-against-v3.18-rc2~73^2~32^2~55
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1038392b4dd02a46006d38f33aab71486d477ced;p=pandora-kernel.git

drm/i915: Disable trickle feed for gen2/3

My 830 is unhappy with trickle feed enabled. The symptom is that
the image on the screen shifts a bit to right occasionally.

The BIOS initially disables trickle feed, but it gets reset during
suspend, so we need to re-disable it ourselves. Juse disable it
always.

Also disable it for all other gen2/3 platforms since we disable it
for all more recent platforms as well (until HSW that is). At least
my 855 doesn't seem to mind us doing this. I don't have gen3
hardware to test that.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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