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943e9292f1
DP Alternate mode specification defines two bytes in the DP capabilities payload with respect to pin configs. One that governs the DFP and the other the UFP. The one that the DP source needs to examine depends upon whether the UFP is a receptacle or a plug. Previously we just examined the DFP pin config which was correct for all UFP plugs but not UFP receptacles. This change fixes that by examining bit <6> of capability message to determe plug vs receptacle and in case of receptacle choosing the UFP ping config instead. Signed-off-by: Todd Broch <tbroch@chromium.org> BRANCH=samus BUG=chromium:505652 TEST=manual, hoho & apple (UFP_D plugs) still work. While I don't have a test for UFP_D receptacle partner device reports following for its DP caps which should now decode correctly. <31:24> 00 Reserved/SBZ <23:16> 1C UFP pin config == C, D, E <15:08> 00 DFP pin config zero <07:00> C5 <6> == 1 == receptacle Change-Id: Ib9e3a808828ff6b8c062baf0fc3c23b3da33c2c3 Reviewed-on: https://chromium-review.googlesource.com/282621 Reviewed-by: Alec Berg <alecaberg@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