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If clk or dat aren't pulled up for an extended period, the i2c controller may get into a wedged state that requires a controller reset to recover from. There are no outward signs of the controller being in such a state, other than transaction timeouts. Therefore, on a transaction timeout, reset the controller. BUG=chrome-os-partner:43270 TEST=Manual on glados: - Run `gpioset PP3300_USB_PD_EN 0` on PD console and wait several seconds - Run `gpioset PP3300_USB_PD_EN 1` on PD console - Run `i2cscan` and verify all ports / devices ack - Repeat above several times BRANCH=None Change-Id: I2ae42762ee6c961224ff50309a448475b67854b5 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/295404 Reviewed-by: Aaron Durbin <adurbin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit