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53fa1d1f09
It is possible for the ALS state machine and the chip to not agree: The EC thinks the device is busy making a measurement, while the chip is waiting for the IRQ status register to be written. It is not clear how it happened, an IRQ must have been lost. Reinitiliazed the chip is stuck for 10s. BRANCH=smaug BUG=chrome-os-partner:45627 TEST=With an extra patch that force the IRQ handler to not do anything every 100th, check the device recovers. Use andro sensor to monitor light/proximity outputs. Change-Id: I80d50bf92af127f85f82dc5c0ae318d4cfe06812 Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/313668
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit