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By default, UART wakes the chip up on RXNE interrupt. This means when the chip wakes up, RDR is full and only the shift register is empty, and this leaves us only the time of a single character to process the character in RDR. On some system, this is not enough and the first (or even the second) character is overrun, and thus any multi-character keys (e.g. arrow keys) break. To avoid this problem, let's change the wake source to wake on start bit detection. This gives us the time for one more character to wake up and process the console input. BRANCH=None BUG=chrome-os-partner:33219 TEST=Enable low power mode on Ryu P2. In STOP mode, hit up arrow key and see the last command show up. Change-Id: Idce4c0bdfcf3e04ad84152ba525f704a0909f115 Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/225771 Reviewed-by: Alec Berg <alecaberg@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@google.com>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit