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sn5s330_init() will turn off the PP1 (source) FET, but sn5s330_is_sourcing_vbus() can be called before PPC init: by usb_charger_init() and pd_power_supply_reset() from pd_task(). Keep track of the PP1 (source) FET state locally, and use this for sn5s330_is_sourcing_vbus(), instead of reading the state from the PPC chip over I2C every time. This solves the problem of sn5s330_is_sourcing_vbus() being called before sn5s330_init(), and also avoids other problems caused by sn5s330_is_sourcing_vbus() doing I2C communication: crrev.com/c/969701/7/board/cheza/board.c#85 BUG=b:80203727 BRANCH=none TEST=Reboot Grunt EC while one USB-C port is VBUS source. Change-Id: Ie0fdd3d672bc747fcdbb746586149e194165fdac Signed-off-by: Edward Hill <ecgh@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1086115 Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com> Reviewed-by: Jett Rink <jettrink@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