The newly introduced mechanism for selecting eDP mode allow us to make a
DisplayPort controller operate in eDP mode, but not the other way
around. The qcom,sc7280-edp compatible is obviously tied to eDP, so this
would not allow us to select DisplayPort-mode.
Switch the compatible of the mdss_edp instance and make it eDP for the
SC7280 qcard.
Signed-off-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
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