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According to PD spec: - Data role shall not be reset on soft reset. - Data role shall be reset to power-role default on hard reset. Implement the above. Even if both ports follow spec, it's still possible for a data role conflict to occur if, for example, data role swap occurs (data role mismatches power role default) followed by a hardware reset of one port (such that data role gets reset to power role default). Handle such cases by taking error recovery actions. BUG=b:71333840,chromium:805040 TEST=Connect scarlet to powered Apple accessory, verify scarlet comes up in SNK-DFP after soft reset and issuing "reboot" on EC console. After issuing a hard reset, the port comes up in SNK-UFP (which is the power-role default). BRANCH=None Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Signed-off-by: Aseda Aboagye <aaboagye@google.com> Change-Id: I65139f277d59a0612f8323d711080f52425ff5e7 Reviewed-on: https://chromium-review.googlesource.com/885462 Commit-Ready: Aseda Aboagye <aaboagye@chromium.org> Tested-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Jett Rink <jettrink@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@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