Yicheng Li 42cd0ab476
platform/chrome: cros_ec: Query EC protocol version if EC transitions between RO/RW ...
RO and RW of EC may have different EC protocol version. If EC transitions
between RO and RW, but AP does not reboot (this is true for fingerprint
microcontroller / cros_fp, but not true for main ec / cros_ec), the AP
still uses the protocol version queried before transition, which can
cause problems. In the case of fingerprint microcontroller, this causes
AP to send the wrong version of EC_CMD_GET_NEXT_EVENT to RO in the
interrupt handler, which in turn prevents RO to clear the interrupt
line to AP, in an infinite loop.
Once an EC_HOST_EVENT_INTERFACE_READY is received, we know that there
might have been a transition between RO and RW, so re-query the protocol.
Signed-off-by: Yicheng Li <yichengli@chromium.org >
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com >
Reviewed-by: Gwendal Grignou <gwendal@chromium.org >
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com >
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42cd0ab476