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Rohm suggests setting VSYS to the higher value during precharge and only setting it to the lower voltage after we have crossed the lower voltage. Note that the VSYS register also controls the pre vs fastcharge threshold, so setting VSYS to the lower voltage essentially enables fastcharge. BUG=chrome-os-partner:55524 BRANCH=None TEST=Manual on kevin, verify dead battery is able to charge through precharge to fastcharge. Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: Ia5b953c8dfbb25970ab329d5487a317ad37ba609 Reviewed-on: https://chromium-review.googlesource.com/362442 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: David Schneider <dnschneid@chromium.org> Reviewed-by: Vijay P Hiremath <vijay.p.hiremath@intel.com> 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