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    drm/i915: add DP 1.2 MST support (v0.7) · 0e32b39c
    Dave Airlie 提交于
    This adds DP 1.2 MST support on Haswell systems.
    
    Notes:
    a) this reworks irq handling for DP MST ports, so that we can
    avoid the mode config locking in the current hpd handlers, as
    we need to process up/down msgs at a better time.
    
    Changes since v0.1:
    use PORT_PCH_HOTPLUG to detect short vs long pulses
    add a workqueue to deal with digital events as they can get blocked on the
    main workqueue beyong mode_config mutex
    fix a bunch of modeset checker warnings
    acks irqs in the driver
    cleanup the MST encoders
    
    Changes since v0.2:
    check irq status again in work handler
    move around bring up and tear down to fix DPMS on/off
    use path properties.
    
    Changes since v0.3:
    updates for mst apis
    more state checker fixes
    irq handling improvements
    fbcon handling support
    improved reference counting of link - fixes redocking.
    
    Changes since v0.4:
    handle gpu reset hpd reinit without oopsing
    check link status on HPD irqs
    fix suspend/resume
    
    Changes since v0.5:
    use proper functions to get max link/lane counts
    fix another checker backtrace - due to connectors disappearing.
    set output type in more places fro, unknown->displayport
    don't talk to devices if no HPD asserted
    check mst on short irqs only
    check link status properly
    rebase onto prepping irq changes.
    drop unsued force_act
    
    Changes since v0.6:
    cleanup unused struct entry.
    
    [airlied: fix some sparse warnings].
    Reviewed-by: NTodd Previte <tprevite@gmail.com>
    Signed-off-by: NDave Airlie <airlied@redhat.com>
    0e32b39c
intel_ddi.c 43.1 KB