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Some Type-C to DP adapters generate two or more HPD events while others generate only one HPD event. Currently hotplugging only works with the former adapter. Now hotplugging is triggered on one or more HPD events. BUG=chrome-os-partner:57198 BRANCH=none TEST=Manuel - plug USBC->DP cable into TV then into kevin localhost ~ # ectool usbpdmuxinfo Port 0: DP INV - plug USBC->DP cable into kevin then into TV localhost ~ # ectool usbpdmuxinfo Port 0: DP INV - unplug USBC->DP cable from TV Port 0: OPEN INV Change-Id: Ied30f1eb3e1186b52067ffc9a37ed22a9012b457 Reviewed-on: https://chromium-review.googlesource.com/388737 Reviewed-by: Shawn N <shawnn@chromium.org> Commit-Queue: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/388531 Commit-Ready: Shawn N <shawnn@chromium.org>