[Intel-gfx] [RFC] drm/i915: downclock support

[Matthew Garrett]

Here's three minor cleanups. The first cleans up the render clock code 
and ensures that the hardware isn't driven out of spec. The second 
restores the gpu clock on module exit. The third avoids reading card 
registers except when necessary.

Signed-off-by: Matthew Garrett <mjg at redhat.com>

-- 
Matthew Garrett | mjg59 at srcf.ucam.org
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