• Lyude Paul's avatar
    drm/i915: Skip vcpi allocation for MSTB ports that are gone · f67207d7
    Lyude Paul authored
    Since we need to be able to allow DPMS on->off prop changes after an MST
    port has disappeared from the system, we need to be able to make sure we
    can compute a config for the resulting atomic commit. Currently this is
    impossible when the port has disappeared, since the VCPI slot searching
    we try to do in intel_dp_mst_compute_config() will fail with -EINVAL.
    
    Since the only commits we want to allow on no-longer-present MST ports
    are ones that shut off display hardware, we already know that no VCPI
    allocations are needed. So, hardcode the VCPI slot count to 0 when
    intel_dp_mst_compute_config() is called on an MST port that's gone.
    
    Changes since V4:
    - Don't use mst_port_gone at all, just check whether or not the drm
      connector is registered - Daniel Vetter
    Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
    Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    Cc: stable@vger.kernel.org
    Link: https://patchwork.freedesktop.org/patch/msgid/20181008232437.5571-5-lyude@redhat.com
    f67207d7
intel_dp_mst.c 19.2 KB