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Based on measurements, Samus can pull more current than desired, even taking into account the existing INPUT_CURRENT_LIMIT_OFFSET_MA adjustment. Decrease the programmed current limit by an additional factor, determined by taking the worst-case power measurements across 15 different Samus devices, to ensure that Samus never pulls more current than desired. BUG=chrome-os-partner:55297 BRANCH=samus TEST=Verify with debug prints that curr_lim_ma becomes 256 when negotiated current limit is 500mA and curr_lim_ma becomes 2556 when negotiated limit is 3000mA. Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: I6912d987c5a519f55a831698873a69c4cac817b8 Reviewed-on: https://chromium-review.googlesource.com/684696 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@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