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The ISL9238 has a functionality where it will reload the adapter current limit from a strap which is read from the PROG pin. This is problematic when we decide to set the current limit prior to AC actually being inserted. This commit disables this functionality from the charger. It seems however that the charger will read the PROG pin and reload the ILIM at least once before respecting the bits. BUG=b:67120928, b:66017697 BRANCH=None TEST=Plug and unplug and then plug again AC. Verify that the default current limit is not set by the charger automatically. Change-Id: Ia8e8742843f6ceb286635b31e0fe5c070a2b6dfe Signed-off-by: Aseda Aboagye <aaboagye@google.com> Reviewed-on: https://chromium-review.googlesource.com/759693 Commit-Ready: Aseda Aboagye <aaboagye@chromium.org> Tested-by: Aseda Aboagye <aaboagye@chromium.org> Tested-by: Shamile Khan <shamile.khan@intel.corp-partner.google.com> 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