From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Thu, 1 Aug 2013 13:18:53 +0000 (+0300)
Subject: drm/i915: Disable specific watermark levels when latency is zero
X-Git-Tag: v3.12-rc1~136^2~59^2~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3312ba65caa23cf1210cc578755babc394769843;p=pandora-kernel.git

drm/i915: Disable specific watermark levels when latency is zero

Return UINT_MAX for the calculated WM level if the latency is zero.
This will lead to marking the WM level as disabled.

I'm not sure if latency==0 should mean that we want to disable the
level. But that's the implication I got from the fact that we don't
even enable the watermark code of the SSKDP register is 0.

v2: Use WARN() to scare people

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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