drm/i915: Power Context register is only available for gen4 mobiles
authorChris Wilson <chris@chris-wilson.co.uk>
Sun, 5 Dec 2010 16:45:02 +0000 (16:45 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Sun, 5 Dec 2010 23:18:31 +0000 (23:18 +0000)
The ability to save the hardware context upon powering down the render
clock through PWRCTXA is only available on a couple of gen4 chipsets.

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

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