From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 16 Jul 2010 16:13:01 +0000 (+0100)
Subject: drm/i915/overlay: Workaround i830 overlay activation bug.
X-Git-Tag: v2.6.37-rc1~92^2~28^2~213
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=106dadacbeeea92f61a2c32f3651ee31c1b34e31;p=pandora-kernel.git

drm/i915/overlay: Workaround i830 overlay activation bug.

On i830, there exists a bug where an overlay on pipe B requires the mode
clock on pipe A in order to activate. So workaround this by activating
pipe A when trying to enable the overlay on pipe B.

References:

  [Bug 29007] GPU hang on video playback with overlay
  https://bugs.freedesktop.org/show_bug.cgi?id=29007

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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