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PD alternate mode is covered in tcpc interface. So tcpci_tcpm_init() doesn't reset HPD. If keeping HDMI/DP type-C cable connected, doing sysjump sets HPD signal to high while it's already high(this high comes from previous state), then OS doesn't output to HDMI/DP monitor. Reef Type-C port 1 follows TCPCI and has this issue. BUG=chrome-os-partner:57689 BRANCH=none TEST=Connect HDMI/DP type-C dongle, boot up system, OS detects HDMI/DP monitor and extends screen to it; in console doing "sysjump RO" or "sysjump RW", display goes out then comes back. Change-Id: I12239a86490f29d0123fe8bad1b813d3be28d041 Signed-off-by: li feng <li1.feng@intel.com> Reviewed-on: https://chromium-review.googlesource.com/398444 Commit-Ready: Li1 Feng <li1.feng@intel.com> Tested-by: Li1 Feng <li1.feng@intel.com> Reviewed-by: Aaron Durbin <adurbin@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