drm/dp_mst: Don't cache EDIDs for physical ports
Caching EDIDs for physical ports prevents updating the EDID if a port gets reconnected via a Connection Status Notification message, fix this. Fixes: db1a0795 ("drm/dp_mst: Handle SST-only branch device case") Cc: Wayne Lin <Wayne.Lin@amd.com> Cc: Lyude Paul <lyude@redhat.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210201120145.350258-2-imre.deak@intel.com
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