Oops in i915 intel_init_clock_gating

Looks like the following commit:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6067aaeadb5b3df26f27ac827256b1ef01e674f5

didn't cope with the pineview case so dev_priv->display.init_clock_gating is NULL causing an Oops.

The old code didn't seem to do anything for pineview so I wrapped the call with a simple NULL check but I'm not sure if that's the correct fix.

Cheers,
Scott

A fix is on its way to master through drm:

95e0ee92d3a605de75a633dd2360700595d5a8ad

drm/i915: fix regression after clock gating init split

During the refactoring in revision 6067aaeadb5b3df26f27ac827256b1ef01e674f5, the intel_enable_clock_gating was split up into several functions that are then called indirectly. However, which function to call was not specified for the IS_PINEVIEW() case. This patch specifies the correct gating function.

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