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In old system driver, ec clears "Predefined Time Occurred" (PTO) flag before setting a new alarm (PT field in WTC). If PT field is the same as the first 25 TTC bits at this moment, we might receive unexpected rtc interrupt again. This CL sets new alarm first then clears PTO flag to make sure rtc interrupt is issued from new alarm. BRANCH=none BUG=b:38310685 TEST=Duplicated the same symptom by the script in issue 38310685 on gru. No symptoms occurred with the same script for 3 hours by applying this CL. Change-Id: Ia6410d6aa4ef8e2acb7bfadf9192d619045bfa58 Signed-off-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-on: https://chromium-review.googlesource.com/508572 Commit-Ready: Philip Chen <philipchen@chromium.org> Tested-by: Philip Chen <philipchen@chromium.org> Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly