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14ba846eea
Change refines HPD debounce values into both upstream and downstream values for packetizing across the type-C link. For LVL, the upstream type-C device will packetize any HPD transition >=2ms as either HIGH or LOW. On the downstream side the value is driven immediately. Additional debouncing should be done by true upstream device according to specification. For IRQ, the upstream type-C device will packetize any HPD pulse >250usec as an IRQ. On the downstream side it will be de-packetized to create 750usec pulse. Signed-off-by: Todd Broch <tbroch@chromium.org> BRANCH=samus BUG=chrome-os-partner:39717 TEST=samus|macbook(2015) + hoho|dingdong|apple HDMI type-C dongles still drive screens successfully. Change-Id: Ide58f3b2d675a82c12ca6afc2be53ca6e2561ace Reviewed-on: https://chromium-review.googlesource.com/273867 Reviewed-by: Alec Berg <alecaberg@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Todd Broch <tbroch@chromium.org> Tested-by: Todd Broch <tbroch@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit