drm/i915: create macros to handle masked bits

... and put them to so good use.

Note that there's functional change in vlv clock gating code, we now
no longer spuriously read back the current value of the bit. According
to Bspec the high bits should always read zero, so ORing this in
should have no effect.

Reviewed-by: Jesse Barnes <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Reviewed-by: Eugeni Dodonov <[email protected]>
Signed-Off-by: Daniel Vetter <[email protected]>

0 files changed, 0 insertions, 0 deletions