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This patch adds a host command to get PD chip info. For PS8751, tcpci_get_chip_info will fail if the chip is in low power mode. It can be woken up by reading a random register first then wait for 10ms. This code doesn't have the wake-up read to avoid 10ms delay. Instead, we call this function immediately after the chip is initialized because it'll gurantee the chip is awake. Once it's called, the chip info will be stored in cache, which can be accessed by tcpc_get_chip_info without worrying about chip states. localhost ~ # ectool pdchipinfo 0 vendor_id: 0xaaaa product_id: 0x3429 device_id: 0xad fw_version: 0x15 localhost ~ # ectool pdchipinfo 1 vendor_id: 0x1da0 product_id: 0x8751 device_id: 0x1 fw_version: 0x37 BUG=chrome-os-partner:62383 BRANCH=none TEST=ectool pdchipinfo 0/1. make buildall Change-Id: I3f1667d00ce1826936d90882ada1df6ed6b0ea37 Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/433166