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Vincent Palatin 4cbb3941b1 zinger: do an intermediate step when discharging from 20V to 5V 
If we discharge directly the output voltage from 20V to 5V under load,
an undershot happens and we dip below the 5V UVP threshold.
So when doing a down voltage transition from 20V to 5V, split it into 2
steps : a 20V->12V transition then once we are reached 12V, a 12V->5V
transition.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=chrome-os-partner:33794
TEST=connect Zinger to a Firefly and an electronic load.
Using Firefly, ask for 20V->5V, 12V->5V and 20V->12V
transitions, check the VBUS waveforms on the scope.

Change-Id: Ie1e091ae6f1fee1fb7d4e3bd72edbe7491acd5ea
Reviewed-on: https://chromium-review.googlesource.com/229732
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Alec Berg <alecaberg@chromium.org>
Tested-by: Alec Berg <alecaberg@chromium.org>
2015-01-10 23:45:31 +00:00
board
zinger: do an intermediate step when discharging from 20V to 5V
2015-01-10 23:45:31 +00:00
chip
samus: pd: fix potential junk at end of tx transmission
2015-01-09 05:40:18 +00:00
common
pd: make VDO responses faster
2015-01-10 23:45:06 +00:00
core
cortex-m0: NVIC: Fix macro for the priority registers
2014-12-18 00:46:33 +00:00
driver
battery: Add support for TI's BQ27621_g1 fuel gauge.
2014-12-31 00:01:00 +00:00
extra
USB-console: Add Linux USB serial kernel module
2014-10-29 18:38:27 +00:00
include
pd: fix possible redundant requests (again)
2015-01-10 23:43:43 +00:00
power
tegra: Preserve sleep mask on sysjump
2015-01-08 00:37:56 +00:00
test
pd: implement new type-C connect state machine
2015-01-10 23:43:25 +00:00
util
lightbar: Don't let EC control suspend/resume sequence
2015-01-10 00:51:14 +00:00
.gitignore
Add TAGS and cscope.* to .gitignore
2014-03-31 22:45:09 +00:00
COMMIT-QUEUE.ini
Ignore failures in HWTest and VMTest in the commit queue.
2013-11-01 14:08:36 +00:00
LICENSE
Add LICENSE file to project
2012-05-11 09:11:52 -07:00
Makefile
twinkie: build a combined firmware
2015-01-08 23:55:58 +00:00
Makefile.rules
Stop building ryu_p1 board.
2015-01-07 08:45:30 +00:00
Makefile.toolchain
twinkie: build a combined firmware
2015-01-08 23:55:58 +00:00
OWNERS
Add OWNERS files
2014-04-02 19:58:53 +00:00
PRESUBMIT.cfg
Add presubmit check for unit test
2014-02-06 19:27:18 +00:00
README
Add standalone lightbar simulation tool
2014-05-15 05:20:14 +00:00
README.fmap
Update EC config and FMAP to reserve room for vboot signatures
2012-05-04 14:42:58 -07:00

README 

For an overview of the Embedded Controller firmware, refer to

http://www.chromium.org/chromium-os/2014-firmware-summit
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