From: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>

The transient MSR values are for very short duration and so I feel reading
out the last set frequency is better than looping until reading something
expected.
Signed-off-by: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>