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    Subject[patch 27/55] drm/i915: DisplayPort hot remove notification to audio driver
    3.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Wu Fengguang <fengguang.wu@intel.com>

    commit 832afda6a7d7235ef0e09f4ec46736861540da6d upstream.

    On DP monitor hot remove, clear DP_AUDIO_OUTPUT_ENABLE accordingly,
    so that the audio driver will receive hot plug events and take action
    to refresh its device state and ELD contents.

    Note that the DP_AUDIO_OUTPUT_ENABLE bit may be enabled or disabled
    only when the link training is complete and set to "Normal".

    Tested OK for both hot plug/remove and DPMS on/off.

    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    Signed-off-by: Keith Packard <keithp@keithp.com>
    Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/i915/intel_dp.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/gpu/drm/i915/intel_dp.c
    +++ b/drivers/gpu/drm/i915/intel_dp.c
    @@ -1554,6 +1554,7 @@ intel_dp_link_down(struct intel_dp *inte
    intel_wait_for_vblank(dev, to_intel_crtc(crtc)->pipe);
    }

    + DP &= ~DP_AUDIO_OUTPUT_ENABLE;
    I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN);
    POSTING_READ(intel_dp->output_reg);
    }



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