From: Keith Packard <keithp@keithp.com>
Date: Mon, 26 Sep 2011 21:29:12 +0000 (-0700)
Subject: drm/i915: Use CK505 as non-SSC source where available
X-Git-Tag: v3.2-rc1~135^2~2^2~44^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99eb6a01e5ac6cf28aadc64e6ff346939874dfd2;p=pandora-kernel.git

drm/i915: Use CK505 as non-SSC source where available

When trying to use SSC on Ibex Peak without CK505, any non-SSC outputs
(like VGA or TV) get broken. So, do not use SSC on Ibex Peak unless
there is a CK505 available (as specified by the VBT).

On Cougar Point, all clocking is internal, so SSC can always be used,
and there will never be a CK505 available.

This eliminates VGA shimmer on some Ironlake machines which have a
CK505 clock source.

References: https://bugzilla.kernel.org/show_bug.cgi?id=21742
References: https://bugs.freedesktop.org/show_bug.cgi?id=38750
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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