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The initial I2C operating speed of the port-0 TCPC chip is 400kHz. It requires changing a register addr:0x48 to a value 0x03 to increase its speed to 1MHz. The BC1.2 chips on port-0 and port-1 also operate at 400kHz, according to the datasheet. So lower the I2C speeds on two TCPC buses to 400kHz. BRANCH=none BUG=b:78142256 TEST=Use console to enable TPCP power and check I2C communication: > gpioset EN_USB_C0_TCPC_PWR 1 > gpioset USB_C0_PD_RST_R_L 1 > i2cscan 1 Scanning 1 tcpc0...................................... 0x4a... 0x50........................ 0x80............................................................... > i2cxfer r 1 0x50 0x00 0xaa [170] Change-Id: I665136d738de50db8beeed338e3102fb5ca6fc84 Signed-off-by: Wai-Hong Tam <waihong@google.com> Reviewed-on: https://chromium-review.googlesource.com/1015763 Reviewed-by: Alexandru M Stan <amstan@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly