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pd: before sysjump send soft reset and then disable PD comms

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Before sysjump we need to send a soft reset to any attached devices
and then disable PD communication so that we don't re-negotiate again
before the sysjump. This will guarantee expected message ID is cleared
for after the sysjump.

This also moves executing soft reset from before sending the soft reset
command to after the port partner accepts a soft reset.

BUG=none
BRANCH=samus
TEST=test on samus. without this change, when sysjumping the PD MCU
has time to re-negotiate (at least partially) before the sysjump, which
causes various problems. with this change, when sysjumping, the PD
MCU sends soft reset, and then does not send anything else.

Change-Id: Id7a60c62c8908ee4ab33dfbe995ef136b0aa83de
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/233751
This commit is contained in:
Alec Berg
2014-12-03 03:06:54 -08:00
committed by chrome-internal-fetch
parent 3c780a915c
commit 8bb26a29b0
3 changed files with 31 additions and 16 deletions
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2
include/usb_pd.h
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@@ -1168,6 +1168,8 @@ void pd_ping_enable(int port, int enable);
/* Issue PD soft reset */
void pd_soft_reset(void);
/* Prepare PD communication for sysjump */
void pd_prepare_sysjump(void);
/**
* Signal power request to indicate a charger update that affects the port.