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PM-runtime: update accounting_timestamp on enable
Initializing accounting_timestamp to something different from 0 during
pm_runtime_init() doesn't make sense and puts an artificial ordering
constraint between timekeeping_init() and pm_runtime_init().
PM-runtime should start time accounting only when it is enabled and
discard the period when disabled.
Set accounting_timestamp to now when enabling PM-runtime.
Suggested-by: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>