drm/i915/intel_i2c: refactor gmbus_xfer
Split out gmbus_xfer_read/write() helper functions. Signed-off-by: NDaniel Kurtz <djkurtz@chromium.org> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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