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Based on measurements, Soraka can pull more current than desired. Decrease the programmed current limit by an additional factor, determined by taking the worst-case power measurements across several different Soraka devices, to ensure that Soraka never pulls more current than desired. BRANCH=None BUG=b:67944740 TEST=Verify with `charger` that input current limit becomes 472mA when a 5V / 500mA charger is plugged, and 2896mA when a 5V / 3000mA charger is plugged. Change-Id: I2b2cb6f445533476d173cd7f5fb825d8b11d1405 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/890102 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Benson Leung <bleung@google.com> Reviewed-by: Furquan Shaikh <furquan@chromium.org> Reviewed-by: Nicolas Boichat <drinkcat@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