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

..

auron

Samus: Handle fan startup in the EC, not the fan controller

2014-11-06 02:28:22 +00:00

bds

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

big

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

cr50

g: implement GPIOs

2014-12-10 22:14:07 +00:00

dingdong

pd: implement new type-C connect state machine

2015-01-10 23:43:25 +00:00

discovery

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

discovery-stm32f072

USB-SPI: Switch from task to deferred function

2014-12-08 21:51:59 +00:00

falco

Samus: Handle fan startup in the EC, not the fan controller

2014-11-06 02:28:22 +00:00

firefly

samus: pd: on PD connection, if sink, ask for power swap

2015-01-07 02:32:38 +00:00

fruitpie

USB: Delete mass storage driver

2015-01-08 00:37:46 +00:00

hadoken

hadoken: Add the BQ27621 configuration parameters.

2014-12-31 00:01:21 +00:00

hoho

pd: implement new type-C connect state machine

2015-01-10 23:43:25 +00:00

host

samus: pd: on PD connection, if sink, ask for power swap

2015-01-07 02:32:38 +00:00

it8380dev

it8380dev: add ec2i control module

2014-12-23 01:50:25 +00:00

jerry

rockchip: Enable UART RX DMA

2014-12-18 00:46:27 +00:00

keyborg

zinger: keyborg: fix runtime bug with task_wait_event()

2014-08-22 00:52:43 +00:00

link

Samus: Handle fan startup in the EC, not the fan controller

2014-11-06 02:28:22 +00:00

mccroskey

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

mec1322_evb

Samus: Handle fan startup in the EC, not the fan controller

2014-11-06 02:28:22 +00:00

mighty

rockchip: Enable UART RX DMA

2014-12-18 00:46:27 +00:00

nyan

nyan: Disable console command help

2015-01-08 00:37:51 +00:00

peppy

Samus: Handle fan startup in the EC, not the fan controller

2014-11-06 02:28:22 +00:00

pinky

rockchip: Enable UART RX DMA

2014-12-18 00:46:27 +00:00

pit

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

plankton

samus: pd: on PD connection, if sink, ask for power swap

2015-01-07 02:32:38 +00:00

rambi

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

ryu

ryu: Debounce BC1.2 charger detection due to asynchronous pin contact

2015-01-09 22:38:19 +00:00

ryu_p1

pd: ryu_p1: Remove console 'typec' command.

2015-01-07 08:45:24 +00:00

ryu_sh

ryu_sh_loader: Add board directory for load image

2014-12-15 22:46:21 +00:00

ryu_sh_loader

ryu_sh_loader: Add board directory for load image

2014-12-15 22:46:21 +00:00

samus

samus: Fix flaw in power up inhibit

2015-01-08 04:02:46 +00:00

samus_pd

samus_pd: remove PWM module

2015-01-10 23:42:53 +00:00

snow

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

speedy

rockchip: Enable UART RX DMA

2014-12-18 00:46:27 +00:00

spring

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

squawks

Makefile: Add support for per-board symlinks to top level

2014-07-30 03:10:06 +00:00

strago

mec1322: Added support to use crystal vs oscillator based on board's clock circuitry.

2014-12-29 19:04:38 +00:00

twinkie

twinkie: build a combined firmware

2015-01-08 23:55:58 +00:00

zinger

zinger: do an intermediate step when discharging from 20V to 5V

2015-01-10 23:45:31 +00:00

minimuffin

zinger: minimuffin: add board support for minimuffin

2014-10-02 20:51:10 +00:00

OWNERS

Add OWNERS files

2014-04-02 19:58:53 +00:00