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3f89130c34
First, improve debounce logic to only notify AP on base detection
change.
Then, handle side-band signals. For that purpose, base EC pulses
detection pin for 100 us to signal out of band USB wake (that
can be used to wake system from deep S3). We filter these, and
only consider a single ~100us during a debounce interval to be
a valid out-of-band signal.
BRANCH=none
BUG=b:35775062
TEST=Flash hammer and poppy, connect them together. Put poppy in
deep S3 (powerd_dbus_suspend), hammer can wake poppy on
key press.
TEST=Change hammer's board_usb_wake to send invalid pulses (too long,
too short, multiple pulses within 5ms), and see that all those
pulses are ignored.
TEST=Check that PP3300_DX_BASE is 0 when base is not connected,
and 1 when it is connected.
Change-Id: I20bf4151134099f52fe8fe0332524aa1ca5f7d63
Reviewed-on: https://chromium-review.googlesource.com/490130
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@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