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We should consider the interval between the calling __hw_clock_event_set and entering deep idle. In order to get more accurate value of deep idle time, FW should record the time-stamp before entering deep idle and calculate the deep idle time based on it. Modified drivers: 1. hwtimer_chip.h: Add new function declarations for deep idle time caculation. 2. hwtimer.c: Add new functionsfor deep idle time caculation. 3. clock.c: Modified for calculating more accurate deep idle time. BUG=chrome-os-partner:34346 TEST=make buildall -j; test nuvoton IC specific drivers BRANCH=none Change-Id: Id037c4dc3564659e4ad493f2fc3ffc5d06c18b06 Signed-off-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-on: https://chromium-review.googlesource.com/320071 Reviewed-by: Randall Spangler <rspangler@chromium.org>