David Hendricks 7a9dc9c0ec snow: re-factor i2c init ...

This re-factors i2c initialization to simplify it and make it follow
the correct order. This is intended to fix a bug where the I2C lines
could be driven low for no good reason on EC startup, potentially
causing issues with other devices.

The ordering should be:
1. Setup pins as inputs on EC startup.
2. Initialize I2C module(s)
3. Re-configure pins as alternate function.

(Thanks to dianders for pointing out this bug)

Signed-off-by: David Hendricks <dhendrix@chromium.org>
BRANCH=snow
BUG=chrome-os-partner:13443
TEST=Tested by examining scope traces during EC reboot

Change-Id: Ibb845f3fd538da387132b1c822929f8613de077d
Reviewed-on: https://gerrit.chromium.org/gerrit/31647
Commit-Ready: David Hendricks <dhendrix@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>

2012-08-30 15:53:35 -07:00

..

lm4

Copy host command params out of LPC space during checksumming

2012-08-28 14:05:08 -07:00

stm32

snow: re-factor i2c init

2012-08-30 15:53:35 -07:00