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displayport: restore DSC when active SST displays return #1349

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displayport: restore DSC when active SST displays return #1349

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13 changes: 13 additions & 0 deletions src/common/displayport/src/dp_groupimpl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,19 @@ void GroupImpl::insert(Device * dev)
return;
}
di->activeGroup = this;

// A returning SST sink may have lost DSC state while the head stayed
// attached. Restore sink decompression and the driver's DSC tracking.
if (!parent->linkUseMultistream() &&
di->getConnectorType() == connectorDisplayPort &&
di->isDSCPossible() &&
(dscModeActive == DSC_SINGLE || dscModeActive == DSC_DUAL))
{
if (!parent->setDeviceDscState(dev, true))
{
DP_PRINTF(DP_WARNING, "DP-GRP: failed to restore DSC state for active SST head %u.", headIndex);
}
}
}

members.insertFront(di);
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