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21a729d007
In preparation of per-branch device down message handling, separate header parsing from message building. This will allow us to peek at figure out which branch device the message is from before starting to parse the message contents. Reviewed-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Wayne Lin <waynelin@amd.com> [seanpaul s/drm_dp_sideband_msg_build/drm_dp_sideband_msg_set_header/] Signed-off-by: Sean Paul <seanpaul@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200213211523.156998-2-sean@poorly.run