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If PD is negotiated and the EC is reset, a source partner port will continue providing its negotiated voltage (eg. 20V in the case of zinger). Ensure the partner port is in a known state by providing Rp for a brief period after resetting to RO. BUG=chrome-os-partner:62281 BRANCH=Reef TEST=On kevin, attach zinger, wait for 20V negotiation, and press F3 + power to cause EC reset. Verify VBUS drops to approximately 0V before going back to 5V / 20V. Verify the same with kevin OEM charger as well. Also verify kevin boots with no battery. Change-Id: I1b769a76188d8a9a515388996fbc4cb3d46840a5 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/433367 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Daisuke Nojiri <dnojiri@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